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Wholesale Price China As568 Standard Rubber O Ring Silicone O-Ring Color Rubber O Ring Manufacturer

Wholesale Price China As568 Standard Rubber O Ring Silicone O-Ring Color Rubber O Ring Manufacturer

Short Description:

Overview and sealing principle of Rubber O-ring

what is  the  rubber o-ring for  and what kind of  rubber is used in o-rings ?O-ring, also known as O-ring, is a type of rubber ring with a circular cross-sectional shape. O-ring is the most widely used sealing element in hydraulic and pneumatic systems. The O-ring has good sealing performance, which can be used for both static and dynamic sealing; Not only can it be used alone, but it is also a fundamental component of many combined sealing devices. It has a wide range of applications, and if the materials are selected properly, it can meet the requirements of various media and motion conditions.O-shaped sealing ring is an extrusion type seal, and the basic working principle of the extrusion type seal is to rely on the elastic deformation of the sealing element to create contact pressure on the sealing contact surface. If the contact pressure is greater than the internal pressure of the sealed medium, no leakage will occur, otherwise, leakage will occur.


Product Detail

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We insist on offering good quality generation with very good business enterprise concept, honest income as well as best and fast assistance. it will bring you not only the premium quality product or service and huge profit, but probably the most significant is usually to occupy the endless market for Wholesale Price China As568 Standard Rubber O Ring Silicone O-Ring Color Rubber O Ring Manufacturer, If possible, make sure you mail your needs with a detailed list including the style/item and quantity you require. We’re going to then ship our greatest prices to you.
We insist on offering good quality generation with very good business enterprise concept, honest income as well as best and fast assistance. it will bring you not only the premium quality product or service and huge profit, but probably the most significant is usually to occupy the endless market for China FKM O Ring and Rubber O Ring, Our technical expertise, customer-friendly service, and specialized merchandise make us/company name the first choice of customers and vendors. We’ve been looking for your inquiry. Let’s set up the cooperation right now!

First -please check the  oring size  AS568   

 

AS568 SIZE Nominal   ID 
    
Nominal  C/S Measurements ID in inches       ±         ID   Measurements                      CS in inches        ±         CS  Measurements ID in mm      ±        ID Measurements                              CS in mm  ±           C/S
-1 1/32        1/32      0.029       0.004    0.040       0.003       0.74    0.10 1.02     0.08
-2 3/64        3/64      0.042       0.004    0.050       0.003       1.07    0.10 1.27     0.08
-3 1/16        1/16      0.056       0.004    0.060       0.003       1.42    0.10 1.52     0.08
-4 5/64        1/16      0.070       0.005    0.070       0.003       1.78    0.13 1.78     0.08
-5 3/32        1/16      0.101       0.005    0.070       0.003       2.57    0.13 1.78     0.08
-6 1/8        1/16      0.114       0.005    0.070       0.003       2.90    0.13 1.78     0.08
-7 5/32        1/16      0.145       0.005    0.070       0.003       3.68    0.13 1.78     0.08
-8 3/16        1/16      0.176       0.005    0.070       0.003       4.47    0.13 1.78     0.08
-9 7/32        1/16      0.208       0.005    0.070       0.003       5.28    0.13 1.78     0.08
-10 1/4        1/16      0.239       0.005    0.070       0.003       6.07    0.13 1.78     0.08
-11 5/16        1/16      0.301       0.005    0.070       0.003       7.65    0.13 1.78     0.08
-12 3/8        1/16      0.364       0.005    0.070       0.003       9.25    0.13 1.78     0.08
-13 7/16        1/16      0.426       0.005    0.070       0.003 10.82    0.13 1.78     0.08
-14 1/2        1/16      0.489       0.005    0.070       0.003 12.42    0.13 1.78     0.08
-15 9/16        1/16      0.551       0.007    0.070       0.003 14.00    0.18 1.78     0.08
-16 5/8        1/16      0.614       0.009    0.070       0.003 15.60    0.23 1.78     0.08
-17 11/16        1/16      0.676       0.009    0.070       0.003 17.17    0.23 1.78     0.08
-18 3/4        1/16      0.739       0.009    0.070       0.003 18.77    0.23 1.78     0.08
-19 13/16        1/16      0.801       0.009    0.070       0.003 20.35    0.23 1.78     0.08
-20 7/8        1/16      0.864       0.009    0.070       0.003 21.95    0.23 1.78     0.08
-21 15/16        1/16      0.926       0.009    0.070       0.003 23.52    0.23 1.78     0.08
-22 1        1/16      0.989       0.010    0.070       0.003 25.12    0.25 1.78     0.08
-23 1  1/16        1/16      1.051       0.010    0.070       0.003 26.70    0.25 1.78     0.08
-24 1  1/8        1/16      1.114       0.010    0.070       0.003 28.30    0.25 1.78     0.08
-25 1 3/16        1/16      1.176       0.011    0.070       0.003 29.87    0.28 1.78     0.08
-26 1  1/4        1/16      1.239       0.011    0.070       0.003 31.47    0.28 1.78     0.08
-27 1 5/16        1/16      1.301       0.011    0.070       0.003 33.05    0.28 1.78     0.08
-28 1  3/8        1/16      1.364       0.013    0.070       0.003 34.65    0.33 1.78     0.08
-29 1  1/2        1/16      1.489       0.013    0.070       0.003 37.82    0.33 1.78     0.08
-30 1 5/8        1/16      1.614       0.013    0.070       0.003 41.00    0.33 1.78     0.08
-31 1  3/4        1/16      1.739       0.015    0.070       0.003 44.17    0.38 1.78     0.08
-32 1 7/8        1/16      1.864       0.015    0.070       0.003 47.35    0.38 1.78     0.08
-33 2        1/16      1.989       0.018    0.070       0.003 50.52    0.46 1.78     0.08
-34 2  1/8        1/16      2.114       0.018    0.070       0.003 53.70    0.46 1.78     0.08
-35 2  1/4        1/16      2.239       0.018    0.070       0.003 56.87    0.46 1.78     0.08
-36 2  3/8        1/16      2.364       0.018    0.070       0.003 60.05    0.46 1.78     0.08
-37 2  1/2        1/16      2.489       0.018    0.070       0.003 63.22    0.46 1.78     0.08
-38 2 5/8        1/16      2.614       0.020    0.070       0.003 66.40    0.51 1.78     0.08
-39 2  3/4        1/16      2.739       0.020    0.070       0.003 69.57    0.51 1.78     0.08
-40 2 7/8        1/16      2.864       0.020    0.070       0.003    72.75    0.51 1.78     0.08
-41 3        1/16      2.989       0.024    0.070       0.003    75.92    0.61 1.78     0.08
-42 3  1/4        1/16      3.239       0.024    0.070       0.003    82.27    0.61 1.78     0.08
-43 3  1/2        1/16      3.489       0.024    0.070       0.003    88.62    0.61 1.78     0.08
-44 3  3/4        1/16      3.739       0.027    0.070       0.003    94.97    0.69 1.78     0.08
-45 4        1/16      3.989       0.027    0.070       0.003  101.32    0.69 1.78     0.08
-46 4  1/4        1/16      4.239       0.030    0.070       0.003  107.67    0.76 1.78     0.08
-47 4  1/2        1/16      4.489       0.030    0.070       0.003  114.02    0.76 1.78     0.08
-48 4  3/4        1/16      4.739       0.030    0.070       0.003  120.37    0.76 1.78     0.08
-49 5        1/16      4.989       0.037    0.070       0.003  126.72    0.94 1.78     0.08
-50 5  1/4        1/16      5.239       0.037    0.070       0.003  133.07    0.94 1.78     0.08
-102 1/16       3/32 0.049       0.005    0.103       0.003       1.24    0.13        2.62     0.08
-103 3/32       3/32 0.081       0.005    0.103       0.003       2.06    0.13        2.62     0.08
-104 1/8       3/32 0.112       0.005    0.103       0.003       2.84    0.13        2.62     0.08
-105 5/32       3/32 0.143       0.005    0.103       0.003       3.63    0.13        2.62     0.08
-106 3/16       3/32 0.174       0.005    0.103       0.003       4.42    0.13        2.62     0.08
-107 7/32       3/32 0.206       0.005    0.103       0.003       5.23    0.13        2.62     0.08
-108 1/4       3/32 0.237       0.005    0.103       0.003       6.02    0.13        2.62     0.08
-109 5/16       3/32 0.299       0.005    0.103       0.003       7.59    0.13        2.62     0.08
-110 3/8       3/32 0.362       0.005    0.103       0.003       9.19    0.13        2.62     0.08
-111 7/16       3/32 0.424       0.005    0.103       0.003 10.77    0.13        2.62     0.08
-112 1/2       3/32 0.487       0.005    0.103       0.003 12.37    0.13        2.62     0.08
-113 9/16       3/32 0.549       0.007    0.103       0.003 13.94    0.18        2.62     0.08
-114 5/8       3/32 0.612       0.009    0.103       0.003 15.54    0.23        2.62     0.08
-115 11/16       3/32 0.674       0.009    0.103       0.003 17.12    0.23        2.62     0.08
-116 3/4       3/32 0.737       0.009    0.103       0.003 18.72    0.23        2.62     0.08
-117 13/16       3/32 0.799       0.010    0.103       0.003 20.29    0.25        2.62     0.08
-118 7/8       3/32 0.862       0.010    0.103       0.003 21.89    0.25        2.62     0.08
-119 15/16       3/32 0.924       0.010    0.103       0.003 23.47    0.25        2.62     0.08
-120 1       3/32 0.987       0.010    0.103       0.003 25.07    0.25        2.62     0.08
-121 1  1/16       3/32 1.049       0.010    0.103       0.003 26.64    0.25        2.62     0.08
-122 1  1/8       3/32 1.112       0.010    0.103       0.003 28.24    0.25        2.62     0.08
-123 1  3/16       3/32 1.174       0.012    0.103       0.003 29.82    0.30        2.62     0.08
-124 1  1/4       3/32 1.237       0.012    0.103       0.003 31.42    0.30        2.62     0.08
-125 1 5/16       3/32 1.299       0.012    0.103       0.003 32.99    0.30        2.62     0.08
-126 1  3/8       3/32 1.362       0.012    0.103       0.003 34.59    0.30        2.62     0.08
-127 1 7/16       3/32 1.424       0.012    0.103       0.003 36.17    0.30        2.62     0.08
-128 1  1/2       3/32 1.487       0.012    0.103       0.003 37.77    0.30        2.62     0.08
-129 1 9/16       3/32 1.549       0.015    0.103       0.003 39.34    0.38        2.62     0.08
-130 1 5/8       3/32 1.612       0.015    0.103       0.003 40.94    0.38        2.62     0.08
-131 1 11/16       3/32 1.674       0.015    0.103       0.003 42.52    0.38        2.62     0.08
-132 1  3/4       3/32 1.737       0.015    0.103       0.003 44.12    0.38        2.62     0.08
-133 1 13/16       3/32 1.799       0.015    0.103       0.003 45.69    0.38        2.62     0.08
-134 1 7/8       3/32 1.862       0.015    0.103       0.003 47.29    0.38        2.62     0.08
-135 1 15/16       3/32 1.925       0.017    0.103       0.003 48.90    0.43        2.62     0.08
-136 2       3/32 1.987       0.017    0.103       0.003 50.47    0.43        2.62     0.08
-137 2  1/16       3/32 2.050       0.017    0.103       0.003 52.07    0.43        2.62     0.08
-138 2  1/8       3/32 2.112       0.017    0.103       0.003 53.64    0.43        2.62     0.08
-139 2  3/16       3/32 2.175       0.017    0.103       0.003 55.25    0.43        2.62     0.08
-140 2  1/4       3/32      2.237       0.017    0.103       0.003    56.82    0.43        2.62     0.08
-141 2 5/16       3/32      2.300       0.020    0.103       0.003    58.42    0.51        2.62     0.08
-142 2  3/8       3/32      2.362       0.020    0.103       0.003    59.99    0.51        2.62     0.08
-143 2 7/16       3/32      2.425       0.020    0.103       0.003    61.60    0.51        2.62     0.08
-144 2  1/2       3/32      2.487       0.020    0.103       0.003    63.17    0.51        2.62     0.08
-145 2 9/16       3/32      2.550       0.020    0.103       0.003    64.77    0.51        2.62     0.08
-146 2 5/8       3/32      2.612       0.020    0.103       0.003    66.34    0.51        2.62     0.08
-147 2 11/16       3/32      2.675       0.022    0.103       0.003    67.95    0.56        2.62     0.08
-148 2  3/4       3/32      2.737       0.022    0.103       0.003    69.52    0.56        2.62     0.08
-149 2 13/16       3/32      2.800       0.022    0.103       0.003    71.12    0.56        2.62     0.08
-150 2 7/8       3/32      2.862       0.022    0.103       0.003    72.69    0.56        2.62     0.08
-151 3       3/32      2.987       0.024    0.103       0.003    75.87    0.61        2.62     0.08
-152 3  1/4       3/32      3.237       0.024    0.103       0.003    82.22    0.61        2.62     0.08
-153 3  1/2       3/32      3.487       0.024    0.103       0.003    88.57    0.61        2.62     0.08
-154 3  3/4       3/32      3.737       0.028    0.103       0.003    94.92    0.71        2.62     0.08
-155 4       3/32      3.987       0.028    0.103       0.003  101.27    0.71        2.62     0.08
-156 4  1/4       3/32      4.237       0.030    0.103       0.003  107.62    0.76        2.62     0.08
-157 4  1/2       3/32      4.487       0.030    0.103       0.003  113.97    0.76        2.62     0.08
-158 4  3/4       3/32      4.737       0.030    0.103       0.003  120.32    0.76        2.62     0.08
-159 5       3/32      4.987       0.035    0.103       0.003  126.67    0.89        2.62     0.08
-160 5  1/4       3/32      5.237       0.035    0.103       0.003  133.02    0.89        2.62     0.08
-161 5  1/2       3/32      5.487       0.035    0.103       0.003  139.37    0.89        2.62     0.08
-162 5  3/4       3/32      5.737       0.035    0.103       0.003  145.72    0.89        2.62     0.08
-163 6       3/32      5.987       0.035    0.103       0.003  152.07    0.89        2.62     0.08
-164 6  1/4       3/32      6.237       0.040    0.103       0.003  158.42    1.02        2.62     0.08
-165 6  1/2       3/32      6.487       0.040    0.103       0.003  164.77    1.02        2.62     0.08
-166 6  3/4       3/32      6.737       0.040    0.103       0.003  171.12    1.02        2.62     0.08
-167 7       3/32      6.987       0.040    0.103       0.003  177.47    1.02        2.62     0.08
-168 7  1/4       3/32      7.237       0.045    0.103       0.003  183.82    1.14        2.62     0.08
-169 7  1/2       3/32      7.487       0.045    0.103       0.003  190.17    1.14        2.62     0.08
-170 7  3/4       3/32      7.737       0.045    0.103       0.003  196.52    1.14        2.62     0.08
-171 8       3/32      7.987       0.045    0.103       0.003  202.87    1.14        2.62     0.08
-172 8  1/4       3/32      8.237       0.050    0.103       0.003  209.22    1.27        2.62     0.08
-173 8  1/2       3/32      8.487       0.050    0.103       0.003  215.57    1.27        2.62     0.08
-174 8  3/4       3/32      8.737       0.050    0.103       0.003  221.92    1.27        2.62     0.08
-175 9       3/32      8.987       0.050    0.103       0.003  228.27    1.27        2.62     0.08
-176 9  1/4       3/32      9.237       0.055    0.103       0.003  234.62    1.40        2.62     0.08
-177 9  1/2       3/32      9.487       0.055    0.103       0.003  240.97    1.40        2.62     0.08
-178 9  3/4       3/32      9.737       0.055    0.103       0.003  247.32    1.40        2.62     0.08
-201 3/16   1/8      0.171       0.005    0.139       0.004       4.34    0.13        3.53     0.10
-202 1/4   1/8      0.234       0.005    0.139       0.004       5.94    0.13        3.53     0.10
-203 5/16   1/8      0.296       0.005    0.139       0.004       7.52    0.13        3.53     0.10
-204 3/8   1/8      0.359       0.005    0.139       0.004       9.12    0.13        3.53     0.10
-205 7/16   1/8      0.421       0.005    0.139       0.004    10.69    0.13        3.53     0.10
-206 1/2   1/8      0.484       0.005    0.139       0.004    12.29    0.13        3.53     0.10
-207 9/16   1/8      0.546       0.007    0.139       0.004    13.87    0.18        3.53     0.10
-208 5/8   1/8      0.609       0.009    0.139       0.004    15.47    0.23        3.53     0.10
-209 11/16   1/8      0.671       0.009    0.139       0.004    17.04    0.23        3.53     0.10
-210 3/4   1/8      0.734       0.010    0.139       0.004    18.64    0.25        3.53     0.10
-211 13/16   1/8      0.796       0.010    0.139       0.004    20.22    0.25        3.53     0.10
-212 7/8   1/8      0.859       0.010    0.139       0.004    21.82    0.25        3.53     0.10
-213 15/16   1/8      0.921       0.010    0.139       0.004    23.39    0.25        3.53     0.10
-214 1   1/8      0.984       0.010    0.139       0.004    24.99    0.25        3.53     0.10
-215 1  1/16   1/8      1.046       0.010    0.139       0.004    26.57    0.25        3.53     0.10
-216 1  1/8   1/8      1.109       0.012    0.139       0.004    28.17    0.30        3.53     0.10
-217 1  3/16   1/8      1.171       0.012    0.139       0.004    29.74    0.30        3.53     0.10
-218 1  1/4   1/8      1.234       0.012    0.139       0.004    31.34    0.30        3.53     0.10
-219 1 5/16   1/8      1.296       0.012    0.139       0.004    32.92    0.30        3.53     0.10
-220 1  3/8   1/8      1.359       0.012    0.139       0.004    34.52    0.30        3.53     0.10
-221 1 7/16   1/8      1.421       0.012    0.139       0.004    36.09    0.30        3.53     0.10
-222 1  1/2   1/8      1.484       0.015    0.139       0.004    37.69    0.38        3.53     0.10
-223 1 5/8   1/8      1.609       0.015    0.139       0.004    40.87    0.38        3.53     0.10
-224 1  3/4   1/8      1.734       0.015    0.139       0.004    44.04    0.38        3.53     0.10
-225 1 7/8   1/8      1.859       0.018    0.139       0.004    47.22    0.46        3.53     0.10
-226 2   1/8      1.984       0.018    0.139       0.004    50.39    0.46        3.53     0.10
-227 2  1/8   1/8      2.109       0.018    0.139       0.004    53.57    0.46        3.53     0.10
-228 2  1/4   1/8      2.234       0.020    0.139       0.004    56.74    0.51        3.53     0.10
-229 2  3/8   1/8      2.359       0.020    0.139       0.004    59.92    0.51        3.53     0.10
-230 2  1/2   1/8      2.484       0.020    0.139       0.004    63.09    0.51        3.53     0.10
-231 2 5/8   1/8      2.609       0.020    0.139       0.004    66.27    0.51        3.53     0.10
-232 2  3/4   1/8      2.734       0.024    0.139       0.004    69.44    0.61        3.53     0.10
-233 2 7/8   1/8      2.859       0.024    0.139       0.004    72.62    0.61        3.53     0.10
-234 3   1/8      2.984       0.024    0.139       0.004    75.79    0.61        3.53     0.10
-235 3  1/8   1/8      3.109       0.024    0.139       0.004    78.97    0.61        3.53     0.10
-236 3  1/4   1/8      3.234       0.024    0.139       0.004    82.14    0.61        3.53     0.10
-237 3  3/8   1/8      3.359       0.024    0.139       0.004    85.32    0.61        3.53     0.10
-238 3  1/2   1/8      3.484       0.024    0.139       0.004    88.49    0.61        3.53     0.10
-239 3 5/8   1/8      3.609       0.028    0.139       0.004    91.67    0.71        3.53     0.10
-240 3  3/4   1/8 3.734       0.028    0.139       0.004    94.84    0.71        3.53     0.10
-241 3 7/8   1/8 3.859       0.028    0.139       0.004    98.02    0.71        3.53     0.10
-242 4   1/8 3.984       0.028    0.139       0.004  101.19    0.71        3.53     0.10
-243 4  1/8   1/8 4.109       0.028    0.139       0.004  104.37    0.71        3.53     0.10
-244 4  1/4   1/8 4.234       0.030    0.139       0.004  107.54    0.76        3.53     0.10
-245 4  3/8   1/8 4.359       0.030    0.139       0.004  110.72    0.76        3.53     0.10
-246 4  1/2   1/8 4.484       0.030    0.139       0.004  113.89    0.76        3.53     0.10
-247 4 5/8   1/8 4.609       0.030    0.139       0.004  117.07    0.76        3.53     0.10
-248 4  3/4   1/8 4.734       0.030    0.139       0.004  120.24    0.76        3.53     0.10
-249 4 7/8   1/8 4.859       0.035    0.139       0.004  123.42    0.89        3.53     0.10
-250 5   1/8 4.984       0.035    0.139       0.004  126.59    0.89        3.53     0.10
-251 5  1/8   1/8 5.109       0.035    0.139       0.004  129.77    0.89        3.53     0.10
-252 5  1/4   1/8 5.234       0.035    0.139       0.004  132.94    0.89        3.53     0.10
-253 5  3/8   1/8 5.359       0.035    0.139       0.004  136.12    0.89        3.53     0.10
-254 5  1/2   1/8 5.484       0.035    0.139       0.004  139.29    0.89        3.53     0.10
-255 5 5/8   1/8 5.609       0.035    0.139       0.004  142.47    0.89        3.53     0.10
-256 5  3/4   1/8 5.734       0.035    0.139       0.004  145.64    0.89        3.53     0.10
-257 5 7/8   1/8 5.859       0.035    0.139       0.004  148.82    0.89        3.53     0.10
-258 6   1/8 5.984       0.035    0.139       0.004  151.99    0.89        3.53     0.10
-259 6  1/4   1/8 6.234       0.040    0.139       0.004  158.34    1.02        3.53     0.10
-260 6  1/2   1/8 6.484       0.040    0.139       0.004  164.69    1.02        3.53     0.10
-261 6  3/4   1/8 6.734       0.040    0.139       0.004  171.04    1.02        3.53     0.10
-262 7   1/8 6.984       0.040    0.139       0.004  177.39    1.02        3.53     0.10
-263 7  1/4   1/8 7.234       0.045    0.139       0.004  183.74    1.14        3.53     0.10
-264 7  1/2   1/8 7.484       0.045    0.139       0.004  190.09    1.14        3.53     0.10
-265 7  3/4   1/8 7.734       0.045    0.139       0.004  196.44    1.14        3.53     0.10
-266 8   1/8 7.984       0.045    0.139       0.004  202.79    1.14        3.53     0.10
-267 8  1/4   1/8 8.234       0.050    0.139       0.004  209.14    1.27        3.53     0.10
-268 8  1/2   1/8 8.484       0.050    0.139       0.004  215.49    1.27        3.53     0.10
-269 8  3/4   1/8 8.734       0.050    0.139       0.004  221.84    1.27        3.53     0.10
-270 9   1/8 8.984       0.050    0.139       0.004  228.19    1.27        3.53     0.10
-271 9  1/4   1/8 9.234       0.055    0.139       0.004  234.54    1.40        3.53     0.10
-272 9  1/2   1/8 9.484       0.055    0.139       0.004  240.89    1.40        3.53     0.10
-273 9  3/4   1/8 9.734       0.055    0.139       0.004  247.24    1.40        3.53     0.10
-274 10   1/8 9.984       0.055    0.139       0.004  253.59    1.40        3.53     0.10
-275 10  1/2   1/8 10.484       0.055    0.139       0.004  266.29    1.40        3.53     0.10
-276 11   1/8 10.984       0.065    0.139       0.004  278.99    1.65        3.53     0.10
-277 11  1/2   1/8 11.484       0.065    0.139       0.004  291.69    1.65        3.53     0.10
-278 12   1/8 11.984       0.065    0.139       0.004  304.39    1.65        3.53     0.10
-279 13   1/8 12.984       0.065    0.139       0.004 329.79     1.65        3.53     0.10
-280 14   1/8 13.984       0.065    0.139       0.004 355.19     1.65        3.53     0.10
-281 15   1/8 14.984       0.065    0.139       0.004 380.59     1.65        3.53     0.10
-282 16   1/8 15.955       0.075    0.139       0.004 405.26     1.91        3.53     0.10
-283 17   1/8 16.955       0.080    0.139       0.004 430.66     2.03        3.53     0.10
-284 18   1/8 17.955       0.085    0.139       0.004 456.06     2.16        3.53     0.10
-309 7/16       3/16 0.412       0.005    0.210       0.005 10.46    0.13       5.33     0.13
-310 1/2       3/16 0.475       0.005    0.210       0.005 12.07    0.13       5.33     0.13
-311 9/16       3/16 0.537       0.007    0.210       0.005 13.64    0.18       5.33     0.13
-312 5/8       3/16 0.600       0.009    0.210       0.005 15.24    0.23       5.33     0.13
-313 11/16       3/16 0.662       0.009    0.210       0.005 16.81    0.23       5.33     0.13
-314 3/4       3/16 0.725       0.010    0.210       0.005 18.42    0.25       5.33     0.13
-315 13/16       3/16 0.787       0.010    0.210       0.005 19.99    0.25       5.33     0.13
-316 7/8       3/16 0.850       0.010    0.210       0.005 21.59    0.25       5.33     0.13
-317 15/16       3/16 0.912       0.010    0.210       0.005 23.16    0.25       5.33     0.13
-318 1       3/16 0.975       0.010    0.210       0.005 24.77    0.25       5.33     0.13
-319 1  1/16       3/16 1.037       0.010    0.210       0.005 26.34    0.25       5.33     0.13
-320 1  1/8       3/16 1.100       0.012    0.210       0.005 27.94    0.30       5.33     0.13
-321 1  3/16       3/16 1.162       0.012    0.210       0.005 29.51    0.30       5.33     0.13
-322 1  1/4       3/16 1.225       0.012    0.210       0.005 31.12    0.30       5.33     0.13
-323 1 5/16       3/16 1.287       0.012    0.210       0.005 32.69    0.30       5.33     0.13
-324 1  3/8       3/16 1.350       0.012    0.210       0.005 34.29    0.30       5.33     0.13
-325 1  1/2       3/16 1.475       0.015    0.210       0.005 37.47    0.38       5.33     0.13
-326 1 5/8       3/16 1.600       0.015    0.210       0.005 40.64    0.38       5.33     0.13
-327 1  3/4       3/16 1.725       0.015    0.210       0.005 43.82    0.38       5.33     0.13
-328 1 7/8       3/16 1.850       0.015    0.210       0.005 46.99    0.38       5.33     0.13
-329 2       3/16 1.975       0.018    0.210       0.005 50.17    0.46       5.33     0.13
-330 2  1/8       3/16 2.100       0.018    0.210       0.005 53.34    0.46       5.33     0.13
-331 2  1/4       3/16 2.225       0.018    0.210       0.005 56.52    0.46       5.33     0.13
-332 2  3/8       3/16 2.350       0.018    0.210       0.005 59.69    0.46       5.33     0.13
-333 2  1/2       3/16 2.475       0.020    0.210       0.005 62.87    0.51       5.33     0.13
-334 2 5/8       3/16 2.600       0.020    0.210       0.005 66.04    0.51       5.33     0.13
-335 2  3/4       3/16 2.725       0.020    0.210       0.005 69.22    0.51       5.33     0.13
-336 2 7/8       3/16 2.850       0.020    0.210       0.005 72.39    0.51       5.33     0.13
-337 3       3/16 2.975       0.024    0.210       0.005 75.57    0.61       5.33     0.13
-338 3  1/8       3/16 3.100       0.024    0.210       0.005 78.74    0.61       5.33     0.13
-339 3  1/4       3/16 3.225       0.024    0.210       0.005 81.92    0.61       5.33     0.13
-340 3  3/8       3/16 3.350       0.024    0.210       0.005 85.09    0.61       5.33     0.13
-341 3  1/2       3/16 3.475       0.024    0.210       0.005 88.27    0.61       5.33     0.13
-342 3 5/8       3/16 3.600       0.028    0.210       0.005 91.44    0.71       5.33     0.13
-343 3  3/4       3/16 3.725       0.028    0.210       0.005 94.62    0.71       5.33     0.13
-344 3 7/8       3/16 3.850       0.028    0.210       0.005 97.79    0.71       5.33     0.13
-345 4       3/16 3.975       0.028    0.210       0.005 100.97    0.71       5.33     0.13
-346 4  1/8       3/16 4.100       0.028    0.210       0.005 104.14    0.71       5.33     0.13
-347 4  1/4       3/16 4.225       0.030    0.210       0.005 107.32    0.76       5.33     0.13
-348 4  3/8       3/16 4.350       0.030    0.210       0.005 110.49     0.76       5.33     0.13
-349 4  1/2       3/16 4.475       0.030    0.210       0.005 113.67     0.76       5.33     0.13
-350 4 5/8       3/16 4.600       0.030    0.210       0.005 116.84     0.76       5.33     0.13
-351 4  3/4       3/16 4.725       0.030    0.210       0.005 120.02     0.76       5.33     0.13
-352 4 7/8       3/16 4.850       0.030    0.210       0.005 123.19     0.76       5.33     0.13
-353 5       3/16 4.975       0.037    0.210       0.005 126.37     0.94       5.33     0.13
-354 5  1/8       3/16 5.100       0.037    0.210       0.005 129.54     0.94       5.33     0.13
-355 5  1/4       3/16 5.225       0.037    0.210       0.005 132.72     0.94       5.33     0.13
-356 5  3/8       3/16 5.350       0.037    0.210       0.005 135.89     0.94       5.33     0.13
-357 5  1/2       3/16 5.475       0.037    0.210       0.005 139.07     0.94       5.33     0.13
-358 5 5/8       3/16 5.600       0.037    0.210       0.005 142.24     0.94       5.33     0.13
-359 5  3/4       3/16 5.725       0.037    0.210       0.005 145.42     0.94       5.33     0.13
-360 5 7/8       3/16 5.850       0.037    0.210       0.005 148.59     0.94       5.33     0.13
-361 6       3/16 5.975       0.037    0.210       0.005 151.77     0.94       5.33     0.13
-362 6  1/4       3/16 6.225       0.040    0.210       0.005 158.12     1.02       5.33     0.13
-363 6  1/2       3/16 6.475       0.040    0.210       0.005 164.47     1.02       5.33     0.13
-364 6  3/4       3/16 6.725       0.040    0.210       0.005 170.82     1.02       5.33     0.13
-365 7       3/16 6.975       0.040    0.210       0.005 177.17     1.02       5.33     0.13
-366 7  1/4       3/16 7.225       0.045    0.210       0.005 183.52     1.14       5.33     0.13
-367 7  1/2       3/16 7.475       0.045    0.210       0.005 189.87     1.14       5.33     0.13
-368 7  3/4       3/16 7.725       0.045    0.210       0.005 196.22     1.14       5.33     0.13
-369 8       3/16 7.975       0.045    0.210       0.005 202.57     1.14       5.33     0.13
-370 8  1/4       3/16 8.225       0.050    0.210       0.005 208.92     1.27       5.33     0.13
-371 8  1/2       3/16 8.475       0.050    0.210       0.005 215.27     1.27       5.33     0.13
-372 8  3/4       3/16 8.725       0.050    0.210       0.005 221.62     1.27       5.33     0.13
-373 9       3/16 8.975       0.050    0.210       0.005 227.97     1.27       5.33     0.13
-374 9  1/4       3/16 9.225       0.055    0.210       0.005 234.32     1.40       5.33     0.13
-375 9  1/2       3/16 9.475       0.055    0.210       0.005 240.67     1.40       5.33     0.13
-376 9  3/4       3/16 9.725       0.055    0.210       0.005 247.02     1.40       5.33     0.13
-377 10       3/16 9.975       0.055    0.210       0.005 253.37     1.40       5.33     0.13
-378 10  1/2       3/16 10.475       0.060    0.210       0.005 266.07     1.52       5.33     0.13
-379 11       3/16 10.975       0.060    0.210       0.005 278.77     1.52       5.33     0.13
-380 11  1/2       3/16 11.475       0.065    0.210       0.005 291.47     1.65       5.33     0.13
-381 12       3/16 11.975       0.065    0.210       0.005 304.17     1.65       5.33     0.13
-382 13       3/16 12.975       0.065    0.210       0.005 329.57     1.65       5.33     0.13
-383 14       3/16 13.975       0.070    0.210       0.005 354.97     1.78       5.33     0.13
-384 15       3/16 14.975       0.070    0.210       0.005 380.37     1.78       5.33     0.13
-385 16       3/16 15.955       0.075    0.210       0.005 405.26     1.91       5.33     0.13
-386 17       3/16 16.955       0.080    0.210       0.005 430.66     2.03       5.33     0.13
-387 18       3/16 17.955       0.085    0.210       0.005 456.06    2.16       5.33     0.13
-388 19       3/16 18.955       0.090    0.210       0.005 481.45    2.29       5.33     0.13
-389 20       3/16 19.955       0.095    0.210       0.005 506.85    2.41       5.33     0.13
-390 21       3/16 20.955       0.095    0.210       0.005 532.25    2.41       5.33     0.13
-391 22       3/16 21.955       0.100    0.210       0.005 557.65    2.54       5.33     0.13
-392 23       3/16 22.940       0.105    0.210       0.005 582.68    2.67       5.33     0.13
-393 24       3/16 23.940       0.110    0.210       0.005 608.08    2.79       5.33     0.13
-394 25       3/16 24.940       0.115    0.210       0.005 633.48    2.92       5.33     0.13
-395 26       3/16 25.940       0.120    0.210       0.005 658.88    3.05       5.33     0.13
-425 4  1/2   1/4      4.475       0.033    0.275       0.006 113.67     0.84       6.99     0.15
-426 4 5/8   1/4      4.600       0.033    0.275       0.006 116.84     0.84       6.99     0.15
-427 4  3/4   1/4      4.725       0.033    0.275       0.006 120.02     0.84       6.99     0.15
-428 4 7/8   1/4      4.850       0.033    0.275       0.006 123.19     0.84       6.99     0.15
-429 5   1/4      4.975       0.037    0.275       0.006 126.37     0.94       6.99     0.15
-430 5  1/8   1/4      5.100       0.037    0.275       0.006 129.54     0.94       6.99     0.15
-431 5  1/4   1/4      5.225       0.037    0.275       0.006 132.72     0.94       6.99     0.15
-432 5  3/8   1/4      5.350       0.037    0.275       0.006 135.89     0.94       6.99     0.15
-433 5  1/2   1/4      5.475       0.037    0.275       0.006 139.07     0.94       6.99     0.15
-434 5 5/8   1/4      5.600       0.037    0.275       0.006 142.24     0.94       6.99     0.15
-435 5  3/4   1/4      5.725       0.037    0.275       0.006 145.42     0.94       6.99     0.15
-436 5 7/8   1/4      5.850       0.037    0.275       0.006 148.59     0.94       6.99     0.15
-437 6   1/4      5.975       0.037    0.275       0.006 151.77     0.94       6.99     0.15
-438 6  1/4   1/4      6.225       0.040    0.275       0.006 158.12     1.02       6.99     0.15
-439 6  1/2   1/4      6.475       0.040    0.275       0.006 164.47     1.02       6.99     0.15
-440 6  3/4   1/4      6.725       0.040    0.275       0.006 170.82     1.02       6.99     0.15
-441 7   1/4      6.975       0.040    0.275       0.006 177.17     1.02       6.99     0.15
-442 7  1/4   1/4      7.225       0.045    0.275       0.006 183.52     1.14       6.99     0.15
-443 7  1/2   1/4      7.475       0.045    0.275       0.006 189.87     1.14       6.99     0.15
-444 7  3/4   1/4      7.725       0.045    0.275       0.006 196.22     1.14       6.99     0.15
-445 8   1/4      7.975       0.045    0.275       0.006 202.57     1.14       6.99     0.15
-446 8  1/2   1/4      8.475       0.055    0.275       0.006 215.27     1.40       6.99     0.15
-447 9   1/4      8.975       0.055    0.275       0.006 227.97     1.40       6.99     0.15
-448 9  1/2   1/4      9.475       0.055    0.275       0.006 240.67     1.40       6.99     0.15
-449 10   1/4      9.975       0.055    0.275       0.006 253.37     1.40       6.99     0.15
-450 10  1/2   1/4 10.475       0.060    0.275       0.006 266.07     1.52       6.99     0.15
-451 11   1/4 10.975       0.060    0.275       0.006 278.77     1.52       6.99     0.15
-452 11  1/2   1/4 11.475       0.060    0.275       0.006 291.47     1.52       6.99     0.15
-453 12   1/4 11.975       0.060    0.275       0.006 304.17     1.52       6.99     0.15
-454 12  1/2   1/4 12.475       0.060    0.275       0.006 316.87     1.52       6.99     0.15
-455 13   1/4 12.975       0.060    0.275       0.006 329.57     1.52       6.99     0.15
-456 13  1/2   1/4 13.475       0.070    0.275       0.006 342.27     1.78       6.99     0.15
-457 14   1/4 13.975       0.070    0.275       0.006 354.97     1.78       6.99     0.15
-458 14  1/2   1/4 14.475       0.070    0.275       0.006 367.67     1.78       6.99     0.15
-459 15   1/4 14.975       0.070    0.275       0.006 380.37     1.78       6.99     0.15
-460 15  1/2   1/4 15.475       0.070    0.275       0.006 393.07     1.78       6.99     0.15
-461 16   1/4 15.955       0.075    0.275       0.006 405.26     1.91       6.99     0.15
-462 16  1/2   1/4 16.455       0.075    0.275       0.006 417.96     1.91       6.99     0.15
-463 17   1/4 16.955       0.080    0.275       0.006 430.66     2.03       6.99     0.15
-464 17  1/2   1/4 17.455       0.085    0.275       0.006 443.36    2.16       6.99     0.15
-465 18   1/4 17.955       0.085    0.275       0.006 456.06    2.16       6.99     0.15
-466 18  1/2   1/4 18.455       0.085    0.275       0.006 468.76    2.16       6.99     0.15
-467 19   1/4 18.955       0.090    0.275       0.006 481.46    2.29       6.99     0.15
-468 19  1/2   1/4 19.455       0.090    0.275       0.006 494.16    2.29       6.99     0.15
-469 20   1/4 19.955       0.095    0.275       0.006 506.86    2.41       6.99     0.15
-470 21   1/4 20.955       0.095    0.275       0.006 532.26    2.41       6.99     0.15
-471 22   1/4 21.955       0.100    0.275       0.006 557.66    2.54       6.99     0.15
-472 23   1/4 22.940       0.105    0.275       0.006 582.68    2.67       6.99     0.15
-473 24   1/4 23.940       0.110    0.275       0.006 608.08    2.79       6.99     0.15
-474 25   1/4 24.940       0.115    0.275       0.006 633.48    2.92       6.99     0.15
-475 26   1/4 25.940       0.120    0.275       0.006 658.88    3.05       6.99     0.15
AS568 SIZE Nominal   ID 
    
   Measurements ID in inches        ±ID  Measurements                   CS  in  inches       ±CS   Measurements   ID in mm     ±ID       Measurements CS in mm      ± C/S
-901 3/32      0.185       0.005    0.056       0.003       4.70    0.13        1.42     0.08
-902 1/8      0.239       0.005    0.064       0.003       6.07    0.13        1.63     0.08
-903 3/16      0.301       0.005    0.064       0.003       7.65    0.13        1.63     0.08
-904 1/4      0.351       0.005    0.072       0.003       8.92    0.13        1.83     0.08
-905 5/16      0.414       0.005    0.072       0.003 10.52    0.13        1.83     0.08
-906 3/8      0.468       0.005    0.078       0.003 11.89    0.13        1.98     0.08
-907 7/16      0.530       0.007    0.082       0.003 13.46    0.18        2.08     0.08
-908 1/2      0.644       0.009    0.087       0.003 16.36    0.23        2.21     0.08
-909 9/16      0.706       0.009    0.097       0.003 17.93    0.23        2.46     0.08
-910 5/8      0.755       0.009    0.097       0.003 19.18    0.23        2.46     0.08
-911 11/16      0.863       0.009    0.116       0.004 21.92    0.23        2.95     0.10
-912 3/4      0.924       0.009    0.116       0.004 23.47    0.23        2.95     0.10
-913 13/16      0.986       0.010    0.116       0.004 25.04    0.25        2.95     0.10
-914 7/8      1.047       0.010    0.116       0.004 26.59    0.25        2.95     0.10
-916 1      1.171       0.010    0.116       0.004 29.74    0.25        2.95     0.10
-918 1  1/8      1.355       0.012    0.116       0.004 34.42    0.30        2.95     0.10
-920 1  1/4      1.475       0.014    0.118       0.004 37.47    0.36        3.00     0.10
-924 1  1/2      1.720       0.014    0.118       0.004 43.69    0.36        3.00     0.10
-928 1  3/4      2.090       0.018    0.118       0.004 53.09    0.46        3.00     0.10
-932 2      2.337       0.018    0.118       0.004 59.36    0.46        3.00     0.10

 

Second -Compression rate and stretching amount for orings

The O-ring is a typical extruded seal. The compression ratio and stretching amount of the cross-sectional diameter of the O-ring are the main contents of sealing design, which are of great significance for sealing performance and service life. The good sealing effect of O-ring largely depends on the correct matching of O-ring size and groove size, forming a reasonable compression and stretching amount of the sealing ring.

1. Compression rate

The compression rate W is commonly expressed as follows:

W=(d0 h)/d0 × 100%

In the formula, d0- the cross-sectional diameter of the O-ring in the free state (mm);

H – The distance between the bottom of the O-ring groove and the sealed surface (groove depth), i.e. the cross-sectional height of the O-ring after compression (mm)

2.When selecting the compression ratio of the O-ring, the following three aspects should be considered:

(1). There should be sufficient sealing contact area;(2). Try to minimize the friction force;(3). Try to avoid permanent deformation.

It is not difficult to see from the above factors that there are contradictions between them. A high compression rate can obtain high contact pressure, but an excessive compression rate undoubtedly increases sliding friction and permanent deformation. If the compression rate is too small, it may be due to the coaxiality error and O-ring error of the sealing groove not meeting the requirements, resulting in the disappearance of some compression amount and causing leakage. Therefore, when choosing the compression ratio of the O-ring, it is necessary to weigh various factors. Generally, the compression rate of static seals is greater than that of dynamic seals, but its extreme value should be less than 25%. Otherwise, the compression stress will significantly relax and excessive permanent deformation will occur, especially in high-temperature working conditions.The selection of compression ratio W for O-ring seals should consider the usage conditions, such as static or dynamic seals; Static sealing can be divided into radial sealing and axial sealing; The leakage gap of radial seals (or cylindrical static seals) is the radial gap, while the leakage gap of axial seals (or planar static seals) is the axial gap. Axial sealing is divided into two situations based on whether the pressure medium acts on the inner diameter or outer diameter of the O-ring: internal pressure and external pressure. The increase in internal pressure leads to stretching, while the external pressure reduces the initial stretching of the O-ring. The different forms of static seals mentioned above have different directions of action of the sealing medium on the O-ring, so the pre pressure design is also different. For dynamic seals, it is necessary to distinguish between reciprocating motion seals and rotary motion seals.

(2). Static sealing: Like reciprocating sealing devices, cylindrical static sealing devices generally take W=10% to 15%; The flat static sealing device takes W=15%~30%.For dynamic sealing, it can be divided into three situations; The reciprocating motion is generally taken as W=10% to 15%. When selecting the compression ratio for rotary motion seals, the Joule heat effect must be considered. Generally speaking, the inner diameter of the O-ring used for rotary motion is 3% -5% larger than the shaft diameter, and the compression ratio of the outer diameter is W=3% -8%. For low friction sports, O-rings are generally selected with a smaller compression ratio of W=5% -8% in order to reduce frictional resistance. In addition, the expansion of rubber materials caused by medium and temperature should also be considered. Usually, beyond the given compression deformation, the maximum allowable expansion rate is 15%. Exceeding this range indicates that the material selection is not appropriate, and O-rings of other materials should be used instead, or the given compression deformation rate should be corrected.

(3)Stretching amount ,After being installed in the sealing groove, the O-ring generally has a certain amount of stretching. Like the compression rate, the amount of stretching also has a significant impact on the sealing performance and service life of the O-ring. A large amount of stretching not only makes it difficult to install the O-ring, but also reduces the compression rate due to changes in the cross-sectional diameter d0, leading to leakage. The stretching amount a can be expressed as follows:α= (d+d0)/(d1+d0) In the formula, d – shaft diameter (mm); D1– Inner diameter of O-ring (mm).The range of stretching amount is 1% -5%. The recommended values for the stretching amount of the O-ring are given in the table. The stretching amount of the O-ring can be selected according to the size of the shaft diameter according to the table’s selection limit. Precedence range of compression ratio and stretching amount for O-ring

 

Third-the relationship between the inner diameter(ID), outer diameter(OD), and wire diameter(C/S) of O-ring. 

OD=ID+C/S*2      Such as  :  ID=3MM   C/S=1MM     OD=3MM+1*2=5MM

 

 

Fourth-Materials commonly used in the production of O-rings

has excellent oil resistance, benzene resistance, heat resistance, and physical and mechanical properties, and is one of the common raw materials for oil resistant rubber products. It is widely used in the manufacturing of oil resistant gaskets, gaskets, rubber hoses, aircraft mailboxes, flexible packaging, printing and dyeing rubber rollers, cable materials, and adhesives.

with  excellent mechanical properties, chemical resistance, and heat resistance, while also exhibiting strong weather resistance. Ethylene propylene diene monomer (EPDM) exhibits excellent properties in terms of ozone resistance, heat resistance, weather resistance, and low softness, making it suitable for applications that are ozone resistant, weather resistant, and UV resistant. However, due to its own structural characteristics, the flame retardancy, oil resistance, and adhesion of EPDM rubber are relatively poor. Nevertheless, this type of rubber has a main chain saturated structure and can be blended with other materials to improve performance by learning from each other’s strengths and weaknesses

 with Temperature and oil resistance. Silicone rubber has good low-temperature resistance and can generally work at -55 ℃. After the introduction of phenyl, it can reach -73 ℃. The heat resistance of silicone rubber is also outstanding, and it can work for a long time at 180 ℃. It can withstand several weeks or more of elasticity even at slightly above 200 ℃, and can instantly withstand high temperatures above 300 ℃. Silicone rubber has good breathability and the oxygen permeability is the highest among synthetic polymers. In addition, silicone rubber also has prominent characteristics of physiological inertness and does not cause coagulation, making it widely used in the medical field.

has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance, and atmospheric aging resistance, and has been widely used in fields such as aerospace, aviation, automotive, petroleum, and household appliances. It is a key material that cannot be replaced in the cutting-edge industries of national defense

 has good oil resistance (good resistance to fuel oil, lubricating oil, and aromatic solvents); And due to its highly saturated structure, it has good heat resistance, excellent chemical corrosion resistance (good resistance to Freon, acid, and alkali), excellent ozone resistance, and high compression permanent deformation resistance; At the same time, hydrogenated nitrile rubber also has characteristics such as high strength, high tear resistance, and excellent wear resistance, making it one of the most excellent rubbers in terms of comprehensive performance.

with good physical and mechanical properties, oil resistance, heat resistance, flame resistance, sunlight resistance, ozone resistance, acid and alkali resistance, and chemical reagent resistance. The disadvantage is poor cold resistance and storage stability. It has high tensile strength, elongation, reversible crystallinity, and good adhesion. Resistant to aging and heat. Excellent oil and chemical resistance

FVMQ: FVMQ O-RING with Good physical and mechanical properties and chemical stability, capable of long-term use at 200 ℃ and short-term use at 250 ℃; The brittleness point ranges from -20 ℃ to -40 ℃; Excellent medium resistance, excellent stability against organic solvents, inorganic acids, and oxidants, especially excellent acid resistance; It has excellent weather resistance and ozone resistance. After being exposed to the atmosphere for several years, its physical and mechanical properties change very little, and its effect on microorganisms is also relatively stable

has good stability, chemical resistance, especially resistance to high concentrations of acids, alkalis, and strong oxidizing agents for various types of vehicle fuels, lubricants, brake oils, mineral oils, and silicone oils, as well as excellent resistance to high-pressure water vapor, water, and electrical insulation. It has low breathability and can be used at temperatures between -400 and 200 degrees Celsius

Has elasticity and thermal and chemical stability of polytetrafluoroethylene. Long term working temperature -39~288 degrees Celsius, short-term up to 315 degrees Celsius, still has a certain degree of plasticity below the embrittlement temperature, hard but not brittle, and can be bent. Stable for all chemicals except for swelling in fluorinated solvents. it is the Currently the most expensive rubber in the world.Brand: Kalrez

 

 Fifth-  rubber O-ring specifications Measurement methods and tools.

Common measuring tools have :

1-High precision projector

projector

Instrument characteristics :Non contact measurement, making measurement invisible and suitable for measuring thin-walled and soft parts;Has strong image magnification function and stronger small size measurement ability;Fast measurement speed greatly improves measurement efficiency;The high density of sampling points ensures high reliability of measurement;Convenient clamping.

2-Electronic digital caliper

caliper

Instrument characteristics :A length measurement tool that uses measurement systems such as capacitive and magnetic grids to display measurement values digitally. The commonly used resolution is 0.01mm, with an allowable error of ± 0.03mm/150mm. There are also high-precision digital calipers with a resolution of 0.005mm, with an allowable error of ± 0.015mm/150mm. There is also a multi-purpose digital display micrometer caliper with a resolution of 0.001mm (which is a national patent for Anyi measuring tools and only they can produce it), with a permissible error of ± 0.005mm/50mm. Due to the intuitive and clear reading, the measurement efficiency is high.

 3-π ruler(PITAPE)

PITAPE

Instrument characteristics :

1. The π ruler is composed of an elastic steel strip. Its two ends are respectively engraved with the main and auxiliary rulers. The minimum graduation value of the main ruler is 0.5mm or 1mm; The minimum graduation values of the auxiliary ruler are 0.02mm, 0.05mm, 0.01mm, 0.1mm, etc.

2. When in use, wrap the π ruler around the workpiece and use a vernier reading method to directly read the average diameter of the measured piece.

  • Advantages and disadvantages

(1). High accuracy: As the diameter is measured through the circumference of the π ruler, the marking error during the production of the ruler can be reduced by π times and reflected in the measurement results. So in the φ In large diameter measurements above 500mm, its accuracy is higher than that of a vernier caliper. stay φ This advantage is particularly prominent in measurements above 1000mm.

(2). When measuring steel parts with a π ruler, it is not affected by the temperature of the work piece. This is because the π ruler is very thin, and it will be is othermal with the tested piece in a very short period of time during measurement. Additionally, their thermal expansion coefficients are very close, basically overcoming the influence of temperature.

(3. In the measurement of large and extra large diameters, the use of auxiliary components (patented magnetic bridges) allows for easy operation by one person at a time.

(4). Measuring thin-walled parts is not easy to cause deformation of the work piece.   (5). Convenient to carry and store   (6). The price is low.

(7). Disadvantage: Unable to lock the reading; Geometric deviations such as ovality cannot be measured.

 

Sixth  O-ring Use and  o-ring  installation.

1. Use of O-ring

O-ring is widely used at the joints of various hydraulic and pneumatic components, cylinder surfaces, and flange surfaces. For O-rings used during movement, when the working pressure is greater than 9.8Mpa and subjected to unidirectional pressure, a retaining ring should be installed on the other side of the O-ring in the direction of pressure; If subjected to bidirectional compression, place a retaining ring on both sides of the O-ring. To reduce friction, wedge-shaped retaining rings can also be used. When the pressure liquid is applied from the left, the right retaining ring is pushed up, and the left retaining ring does not come into contact with the sealed surface, thus reducing the friction force. Overall, the use of retaining rings increases the friction force of the sealing device, and wedge shaped retaining rings are of great significance in reducing this friction force. For fixed O-rings, a retaining ring is also required when the working pressure is greater than 32Mpa.

2. Oring  installation

The installation quality of O-rings has a significant impact on their sealing performance and service life. Leakage problems are often caused by poor installation.During the installation process, it is not allowed to have the O-ring scratched, misaligned, or twisted. Before assembly, the sealing groove and sealing mating surface must be strictly cleaned; At the same time, apply lubricating grease to the surface that needs to pass through during the assembly of the O-ring.To prevent the O-ring from being cut or scratched by sharp edges such as sharp corners and threads during installation, a 15 º to 30 º lead-in angle should be left at the shaft end and hole end of the installation. When the O-ring needs to pass through the external thread, a special thin-walled metal guide sleeve should be used to cover the external thread; If the O-ring needs to pass through the orifice, the orifice should be inverted into a corresponding diagonal shape to prevent scratches on the O-ring. The slope angle of the groove is generally a=120 º~140 º

You can learn a lot of related knowledge from here. Later, we will introduce some knowledge about oil seals, hydraulic seal, or other customized rubber parts ,such as Cat oil seal, NBR oil seal ,FKM oil seal, TC oil seal,TB oil seal  TA oil seal , SC oil seal   SB oil seal ,piston seal ,rod seal ,spring seal ,bonded seal, u cup seal,dust seal,Wiper seal,wear ring ,back up ring , rubber cords, o-ring cords ,so we need more time  introduce this knowledge to everyone. Thanks for your time !

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