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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. 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.
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
G100 B-70 N/A
178181 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 N/A 99.40 mm3.913 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-100 N/A N/A O-rings are used in the military defense and agriculture industries.
G100 B-90 N/A
178182 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 99.40 mm3.913 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-100 N/A N/A O-rings are used in the military defense and agriculture industries.
G105 B-70 N/A
178183 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 N/A 104.40 mm4.110 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-105 N/A N/A O-rings are used in the military defense and agriculture industries.
G105 B-90 N/A
178184 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 104.40 mm4.110 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-105 N/A N/A O-rings are used in the military defense and agriculture industries.
G110 B-70 N/A
178185 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 N/A 109.40 mm4.307 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-110 N/A N/A O-rings are used in the military defense and agriculture industries.
G110 B-90 N/A
178186 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 109.40 mm4.307 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-110 N/A N/A O-rings are used in the military defense and agriculture industries.
G115 B-70 N/A
178187 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 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.
G115 B-90 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
G120 B-70 N/A
178189 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 N/A 119.40 mm4.701 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-120 N/A N/A O-rings are used in the military defense and agriculture industries.
G120 B-90 N/A
178190 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 119.40 mm4.701 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-120 N/A N/A O-rings are used in the military defense and agriculture industries.
G125 B-70 N/A
178191 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 N/A 124.40 mm4.898 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-125 N/A N/A O-rings are used in the military defense and agriculture industries.
G125 B-90 N/A
178192 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 124.40 mm4.898 in N/A 0.004 in0.10 mm N/A 0.016 in0.40 mm N/A G-125 N/A N/A O-rings are used in the military defense and agriculture industries.
G130 B-70 N/A
178193 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 N/A 129.40 mm5.094 in N/A 0.004 in0.10 mm N/A 0.024 in0.60 mm N/A G-130 N/A N/A O-rings are used in the military defense and agriculture industries.
G130 B-90 N/A
178194 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 129.40 mm5.094 in N/A 0.004 in0.10 mm N/A 0.024 in0.60 mm N/A G-130 N/A N/A O-rings are used in the military defense and agriculture industries.
G135 B-70 N/A
178195 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 N/A 134.40 mm5.291 in N/A 0.004 in0.10 mm N/A 0.024 in0.60 mm N/A G-135 N/A N/A O-rings are used in the military defense and agriculture industries.
G135 B-90 N/A
178196 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 134.40 mm5.291 in N/A 0.004 in0.10 mm N/A 0.024 in0.60 mm N/A G-135 N/A N/A O-rings are used in the military defense and agriculture industries.
G140 B-70 N/A
178197 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 N/A 139.40 mm5.488 in N/A 0.004 in0.10 mm N/A 0.024 in0.60 mm N/A G-140 N/A N/A O-rings are used in the military defense and agriculture industries.
G140 B-90 N/A
178198 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 90 N/A 139.40 mm5.488 in N/A 0.004 in0.10 mm N/A 0.024 in0.60 mm N/A G-140 N/A N/A O-rings are used in the military defense and agriculture industries.
G145 B-70 N/A
178199 		N/A JIS Standard O-Ring N/A Buna N/A 0.122 in3.10 mm N/A 70 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.
G145 B-90 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
G150 B-70 N/A
178201 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 70 N/A 149.30 mm5.878 in N/A 0.006 in0.15 mm N/A 0.024 in0.60 mm N/A G-150 N/A N/A O-rings are used in the military defense and agriculture industries.
G150 B-90 N/A
178202 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 90 N/A 149.30 mm5.878 in N/A 0.006 in0.15 mm N/A 0.024 in0.60 mm N/A G-150 N/A N/A O-rings are used in the military defense and agriculture industries.
G155 B-70 N/A
178203 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 70 N/A 154.30 mm6.075 in N/A 0.006 in0.15 mm N/A 0.024 in0.60 mm N/A G-155 N/A N/A O-rings are used in the military defense and agriculture industries.
G155 B-90 N/A
178204 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 90 N/A 154.30 mm6.075 in N/A 0.006 in0.15 mm N/A 0.024 in0.60 mm N/A G-155 N/A N/A O-rings are used in the military defense and agriculture industries.
G160 B-70 N/A
178205 		N/A JIS Standard O-Ring N/A Buna N/A 0.224 in5.70 mm N/A 70 N/A 159.30 mm6.272 in N/A 0.006 in0.15 mm N/A 0.024 in0.60 mm N/A G-160 N/A N/A O-rings are used in the military defense and agriculture industries.
Unit of Measure
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