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.

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Inside Diamter (mm)

Inside Diamter (in)

Cross Section Width (in)

Cross Section Width (mm)

Durometer

70 90

Item #

Inside Diamter

Cross Section Width

Durometer

CSW Tolerance

JIS Number

ID Tolerance

N/A 99.40 mm3.913 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-100 N/A 0.016 in0.40 mm
N/A 99.40 mm3.913 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-100 N/A 0.016 in0.40 mm
N/A 104.40 mm4.110 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-105 N/A 0.016 in0.40 mm
N/A 104.40 mm4.110 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-105 N/A 0.016 in0.40 mm
N/A 109.40 mm4.307 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-110 N/A 0.016 in0.40 mm
N/A 109.40 mm4.307 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-110 N/A 0.016 in0.40 mm
N/A 114.40 mm4.504 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-115 N/A 0.016 in0.40 mm
N/A 114.40 mm4.504 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-115 N/A 0.016 in0.40 mm
N/A 119.40 mm4.701 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-120 N/A 0.016 in0.40 mm
N/A 119.40 mm4.701 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-120 N/A 0.016 in0.40 mm
N/A 124.40 mm4.898 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-125 N/A 0.016 in0.40 mm
N/A 124.40 mm4.898 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-125 N/A 0.016 in0.40 mm
N/A 129.40 mm5.094 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-130 N/A 0.024 in0.60 mm
N/A 129.40 mm5.094 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-130 N/A 0.024 in0.60 mm
N/A 134.40 mm5.291 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-135 N/A 0.024 in0.60 mm
N/A 134.40 mm5.291 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-135 N/A 0.024 in0.60 mm
N/A 139.40 mm5.488 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-140 N/A 0.024 in0.60 mm
N/A 139.40 mm5.488 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-140 N/A 0.024 in0.60 mm
N/A 144.40 mm5.685 in N/A 0.122 in3.10 mm N/A 70 N/A 0.004 in0.10 mm N/A G-145 N/A 0.024 in0.60 mm
N/A 144.40 mm5.685 in N/A 0.122 in3.10 mm N/A 90 N/A 0.004 in0.10 mm N/A G-145 N/A 0.024 in0.60 mm
N/A 149.30 mm5.878 in N/A 0.224 in5.70 mm N/A 70 N/A 0.006 in0.15 mm N/A G-150 N/A 0.024 in0.60 mm
N/A 149.30 mm5.878 in N/A 0.224 in5.70 mm N/A 90 N/A 0.006 in0.15 mm N/A G-150 N/A 0.024 in0.60 mm
N/A 154.30 mm6.075 in N/A 0.224 in5.70 mm N/A 70 N/A 0.006 in0.15 mm N/A G-155 N/A 0.024 in0.60 mm
N/A 154.30 mm6.075 in N/A 0.224 in5.70 mm N/A 90 N/A 0.006 in0.15 mm N/A G-155 N/A 0.024 in0.60 mm
N/A 159.30 mm6.272 in N/A 0.224 in5.70 mm N/A 70 N/A 0.006 in0.15 mm N/A G-160 N/A 0.024 in0.60 mm
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