• JIS O-Rings
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. Buna is also known as: Nitrile, NBR, N, Buna-N.

Nitrile, chemically, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content is varied in commercial products from 18% to 48%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases.

Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -65 to +275°F(-54 to +135°C), nitrile is the most widely used elastomer in the seal industry today.

Inherently nitrile does not possess good resistance to ozone, sunlight or weather, but this can be substantially improved through compounding. 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
178188 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 114.40 mm4.504 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-115 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178200 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 144.40 mm5.685 in N/A 0.004 in0.10 mm N/A 0.024 in0.60 mm N/A G-145 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178212 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 90 N/A 174.30 mm6.862 in N/A 0.006 in0.15 mm N/A 0.024 in0.60 mm N/A G-175 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178224 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 90 N/A 209.3 mm8.240 in N/A 0.006 in0.15 mm N/A 0.031 in0.80 mm N/A G-210 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178236 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 90 N/A 254.3 mm10.012 in N/A 0.006 in0.15 mm N/A 0.031 in0.80 mm N/A G-255 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178246 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 29.40 mm1.157 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A G-30 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178258 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 54.40 mm2.142 in N/A 0.004 in0.10 mm N/A 0.01 in0.25 mm N/A G-55 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178270 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 84.40 mm3.323 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-85 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178284 		N/A JIS Standard O-Ring N/A Buna N/A 0.094 in2.40 mm N/A 90 N/A 9.80 mm0.386 in N/A 0.003 in0.09 mm N/A 0.005 in0.12 mm N/A P-10A N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178296 		N/A JIS Standard O-Ring N/A Buna N/A 0.094 in2.40 mm N/A 90 N/A 11.80 mm0.465 in N/A 0.003 in0.09 mm N/A 0.005 in0.12 mm N/A P-12 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178308 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 90 N/A 134.60 mm5.299 in N/A 0.006 in0.15 mm N/A 0.024 in0.60 mm N/A P-135 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178322 		N/A JIS Standard O-Ring N/A Buna N/A 0.331 in8.40 mm N/A 90 N/A 154.50 mm6.083 in N/A 0.006 in0.18 mm N/A 0.024 in0.60 mm N/A P-155 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178334 		N/A JIS Standard O-Ring N/A Buna N/A 0.094 in2.40 mm N/A 90 N/A 17.80 mm0.701 in N/A 0.003 in0.09 mm N/A 0.005 in0.12 mm N/A P-18 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178346 		N/A JIS Standard O-Ring N/A Buna N/A 0.331 in8.40 mm N/A 90 N/A 199.5 mm7.854 in N/A 0.006 in0.18 mm N/A 0.031 in0.80 mm N/A P-200 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178360 		N/A JIS Standard O-Ring N/A Buna N/A 0.138 in3.50 mm N/A 90 N/A 22.10 mm0.870 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-22.4 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178372 		N/A JIS Standard O-Ring N/A Buna N/A 0.138 in3.50 mm N/A 90 N/A 23.70 mm0.933 in N/A 0.004 in0.10 mm N/A 0.006 in0.15 mm N/A P-24 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
178384 		N/A JIS Standard O-Ring N/A Buna N/A 0.331 in8.40 mm N/A 90 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 defense and agriculture industries.v
N/A
178395 		N/A JIS Standard O-Ring N/A Buna 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 defense and agriculture industries.v
N/A
178410 		N/A JIS Standard O-Ring N/A Buna N/A 0.138 in3.50 mm N/A 90 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 defense and agriculture industries.v
N/A
178422 		N/A JIS Standard O-Ring N/A Buna N/A 0.331 in8.40 mm N/A 90 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 defense and agriculture industries.v
N/A
178436 		N/A JIS Standard O-Ring N/A Buna N/A 0.138 in3.50 mm N/A 90 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 defense and agriculture industries.v
N/A
178451 		N/A JIS Standard O-Ring N/A Buna 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 defense and agriculture industries.v
N/A
178463 		N/A JIS Standard O-Ring N/A Buna 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 defense and agriculture industries.v
N/A
178477 		N/A JIS Standard O-Ring N/A Buna 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 defense and agriculture industries.v
N/A
178492 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 90 N/A 62.60 mm2.465 in N/A 0.006 in0.15 mm N/A 0.01 in0.25 mm N/A P-63 N/A N/A O-rings are used in the military defense and agriculture industries.v
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