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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
P35.5 S-70 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.
P355 S-70 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.
P36 S-70 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.
P360 S-70 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.
P375 S-70 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.
P38 S-70 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.
P385 S-70 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.
P39 S-70 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.
P4 S-70 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.
P40 S-70 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.
P400 S-70 N/A
180396 		N/A JIS Standard O-Ring N/A Silicone N/A 0.331 in8.40 mm N/A 70 N/A 399.5 mm15.728 in N/A 0.006 in0.18 mm N/A 0.039 in1.00 mm N/A P-400 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P41 S-70 N/A
180397 		N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 40.70 mm1.602 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A P-41 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P42 S-70 N/A
180398 		N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 41.70 mm1.642 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A P-42 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P44 S-70 N/A
180399 		N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 43.70 mm1.720 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A P-44 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P45 S-70 N/A
180400 		N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 44.70 mm1.760 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A P-45 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P46 S-70 N/A
180401 		N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 45.70 mm1.799 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A P-46 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P48 S-70 N/A
180402 		N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 47.70 mm1.878 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A P-48 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P48A S-70 N/A
180403 		N/A JIS Standard O-Ring N/A Silicone N/A 0.224 in5.70 mm N/A 70 N/A 47.60 mm1.874 in N/A 0.006 in0.15 mm N/A 0.01 in0.25 mm N/A P-48A N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P49 S-70 N/A
180404 		N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 48.70 mm1.917 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A P-49 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P5 S-70 N/A
180405 		N/A JIS Standard O-Ring N/A Silicone N/A 0.075 in1.90 mm N/A 70 N/A 4.80 mm0.189 in N/A 0.003 in0.09 mm N/A 0.005 in0.12 mm N/A P-5 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P50 S-70 N/A
180406 		N/A JIS Standard O-Ring N/A Silicone N/A 0.138 in3.50 mm N/A 70 N/A 49.70 mm1.957 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A P-50 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P50A S-70 N/A
180407 		N/A JIS Standard O-Ring N/A Silicone N/A 0.224 in5.70 mm N/A 70 N/A 49.60 mm1.953 in N/A 0.006 in0.15 mm N/A 0.01 in0.25 mm N/A P-50A N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P52 S-70 N/A
180408 		N/A JIS Standard O-Ring N/A Silicone N/A 0.224 in5.70 mm N/A 70 N/A 51.60 mm2.031 in N/A 0.006 in0.15 mm N/A 0.01 in0.25 mm N/A P-52 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P53 S-70 N/A
180409 		N/A JIS Standard O-Ring N/A Silicone N/A 0.224 in5.70 mm N/A 70 N/A 52.6 mm2.071 in N/A 0.006 in0.15 mm N/A 0.01 in0.25 mm N/A P-53 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
P55 S-70 N/A
180410 		N/A JIS Standard O-Ring N/A Silicone N/A 0.224 in5.70 mm N/A 70 N/A 54.60 mm2.150 in N/A 0.006 in0.15 mm N/A 0.01 in0.25 mm N/A P-55 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
Unit of Measure
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