British Standard O-Rings are very similar to Standard O-Rings in the fact that they are both standardized imperically. The British Standard however, incorporates some extended sizes in the 1/4" nominal cross section group for an even broader application range. British Standard O-Rings serve a variety of industries including aerospace, paint, food, and chemical transport. 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

N/A
184318
N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 3.299 in83.79 mm N/A 0.003 in0.08 mm N/A -643 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184319
N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 3.174 in80.62 mm N/A 0.003 in0.08 mm N/A -642 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184320
N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 3.174 in80.62 mm N/A 0.003 in0.08 mm N/A -642 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184321
N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 3.049 in77.44 mm N/A 0.003 in0.08 mm N/A -641 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184322
N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 3.049 in77.44 mm N/A 0.003 in0.08 mm N/A -641 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184323
N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.924 in74.27 mm N/A 0.003 in0.08 mm N/A -640 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184324
N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.924 in74.27 mm N/A 0.003 in0.08 mm N/A -640 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184325
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 6.563 in166.70 mm N/A 0.006 in0.15 mm N/A -628 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184326
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 6.563 in166.70 mm N/A 0.006 in0.15 mm N/A -628 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184327
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 6.281 in159.54 mm N/A 0.006 in0.15 mm N/A -627 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184328
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 6.281 in159.54 mm N/A 0.006 in0.15 mm N/A -627 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184329
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 5.297 in134.54 mm N/A 0.006 in0.15 mm N/A -626 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184330
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 5.297 in134.54 mm N/A 0.006 in0.15 mm N/A -626 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184331
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 4.906 in124.61 mm N/A 0.006 in0.15 mm N/A -625 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184332
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 4.906 in124.61 mm N/A 0.006 in0.15 mm N/A -625 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184333
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 4.516 in114.71 mm N/A 0.006 in0.15 mm N/A -624 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184334
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 4.516 in114.71 mm N/A 0.006 in0.15 mm N/A -624 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184335
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.313 in109.54 mm N/A 0.005 in0.13 mm N/A -623 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184336
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.313 in109.54 mm N/A 0.005 in0.13 mm N/A -623 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184337
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 3.937 in100.00 mm N/A 0.005 in0.13 mm N/A -622 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184338
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 3.937 in100.00 mm N/A 0.005 in0.13 mm N/A -622 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184339
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 3.531 in89.69 mm N/A 0.005 in0.13 mm N/A -621 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184340
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 3.531 in89.69 mm N/A 0.005 in0.13 mm N/A -621 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184341
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 3.141 in79.78 mm N/A 0.005 in0.13 mm N/A -620 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184342
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 3.141 in79.78 mm N/A 0.005 in0.13 mm N/A -620 N/A N/A O-rings are used in the military defense and agriculture industries.
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