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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.
JIS O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Section Width

Durometer

Inside Diameter

CSW Tolerance

ID Tolerance

JIS Number

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O-Ring Industries

Quantity
P250 S-70 N/A
180361
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 249.5 mm9.823 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-250 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P255 S-70 N/A
180362
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 254.5 mm10.020 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-255 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P26 S-70 N/A
180363
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 25.70 mm1.012 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-26 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P260 S-70 N/A
180364
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 259.5 mm10.217 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-260 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P265 S-70 N/A
180365
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 264.5 mm10.413 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-265 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P270 S-70 N/A
180366
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 269.5 mm10.610 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-270 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P275 S-70 N/A
180367
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 274.50 mm10.807 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-275 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P28 S-70 N/A
180368
N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 27.70 mm1.091 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-28 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P280 S-70 N/A
180369
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 279.50 mm11.004 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-280 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P285 S-70 N/A
180370
N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 284.50 mm11.201 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-285 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P29 S-70 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.
P29.5 S-70 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.
P290 S-70 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.
P295 S-70 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.
P30 S-70 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.
P300 S-70 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.
P31 S-70 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.
P31.5 S-70 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.
P315 S-70 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.
P32 S-70 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.
P320 S-70 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.
P335 S-70 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.
P34 S-70 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.
P340 S-70 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.
P35 S-70 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.
Unit of Measure
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