Japanese Industrial Standard O-Rings are another popular classification system used around the globe. Published by the Japanese Standard Association, these o-rings are also categorized using the metric system. JIS O-Rings are used in many different fields, but typically are implemented in Japan's semiconductor, automotive and machine tool industries.

This elastomer possesses mechanical properties similar to Viton®, with the exception of its slightly lower compression set resistance. It is more suitable for sensitive applications where lighter compressive forces are applied to energize the seal. This core has a Shore A hardness of 70 but it also offers a broader operating temperature range of -80°F to +500°F. (-62°C to +260°C). For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
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O-Ring Industries

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N/A
180395
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 39.70 mm1.563 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-40 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180394
N/A JIS Standard O-Ring N/A Silicone N/A 0.075 in1.90 mm N/A 70 N/A 3.80 mm0.150 in N/A 0.003 in0.09 mm N/A 0.005 in0.12 mm N/A P-4 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180393
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 38.70 mm1.524 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-39 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180392
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 384.50 mm15.138 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-385 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180391
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 37.70 mm1.484 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-38 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180390
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 374.50 mm14.744 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-375 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180389
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 359.50 mm14.154 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-360 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180388
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 35.70 mm1.406 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-36 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180387
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 354.50 mm13.957 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-355 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180386
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 35.20 mm1.386 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-35.5 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180385
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 34.70 mm1.366 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-35 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180384
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 339.50 mm13.366 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-340 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180383
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 33.70 mm1.327 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-34 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180382
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 334.50 mm13.169 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-335 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180381
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 319.50 mm12.579 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-320 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180380
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 31.70 mm1.248 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-32 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180379
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 314.50 mm12.382 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-315 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180378
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 31.20 mm1.228 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-31.5 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180377
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 30.70 mm1.209 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-31 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180376
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 299.50 mm11.791 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-300 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180375
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 29.70 mm1.169 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-30 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180374
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 294.50 mm11.594 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-295 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180373
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 289.50 mm11.398 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-290 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180372
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 29.20 mm1.150 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-29.5 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
180371
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 28.70 mm1.130 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-29 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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