• BS O-Rings
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

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N/A
184204 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 7.125 in180.98 mm N/A 0.006 in0.15 mm N/A -880 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184216 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.75 in146.05 mm N/A 0.005 in0.13 mm N/A -869 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184230 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.875 in123.83 mm N/A 0.005 in0.13 mm N/A -862 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184245 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 2.625 in66.68 mm N/A 0.004 in0.10 mm N/A -841 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184257 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 2.25 in57.15 mm N/A 0.004 in0.10 mm N/A -835 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184271 		N/A BS Standard O-Ring N/A Buna N/A 0.139 in3.53 mm N/A 70 N/A 1.813 in46.04 mm N/A 0.004 in0.10 mm N/A -828 N/A N/A O-rings are used in the military defense and agriculture industries.v
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184286 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 0.812 in20.62 mm N/A 0.003 in0.08 mm N/A -812 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184298 		N/A BS Standard O-Ring N/A Buna N/A 0.070 in1.78 mm N/A 90 N/A 0.25 in6.35 mm N/A 0.003 in0.08 mm N/A -803 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184312 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 6.600 in167.64 mm N/A 0.005 in0.13 mm N/A -646 N/A N/A O-rings are used in the military defense and agriculture industries.v
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
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
184353 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 0.469 in11.91 mm N/A 0.003 in0.08 mm N/A -614 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184372 		N/A BS Standard O-Ring N/A Buna N/A 0.070 in1.78 mm N/A 90 N/A 6.470 in164.34 mm N/A 0.003 in0.08 mm N/A -559 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184384 		N/A BS Standard O-Ring N/A Buna N/A 0.070 in1.78 mm N/A 90 N/A 5.72 in145.29 mm N/A 0.003 in0.08 mm N/A -553 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184398 		N/A BS Standard O-Ring N/A Buna N/A 0.070 in1.78 mm N/A 90 N/A 4.36 in110.74 mm N/A 0.003 in0.08 mm N/A -542 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184413 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 25.9401 in658.88 mm N/A 0.006 in0.15 mm N/A -475 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184425 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 19.955 in506.86 mm N/A 0.006 in0.15 mm N/A -469 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184439 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 16.455 in417.96 mm N/A 0.006 in0.15 mm N/A -462 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184454 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 12.975 in329.57 mm N/A 0.006 in0.15 mm N/A -455 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184466 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 9.975 in253.37 mm N/A 0.006 in0.15 mm N/A -449 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184480 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 7.225 in183.52 mm N/A 0.006 in0.15 mm N/A -442 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184495 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 5.600 in142.24 mm N/A 0.006 in0.15 mm N/A -434 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184507 		N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 4.850 in123.19 mm N/A 0.006 in0.15 mm N/A -428 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A
184521 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 22.940 in582.68 mm N/A 0.005 in0.13 mm N/A -392 N/A N/A O-rings are used in the military defense and agriculture industries.v
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184540 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 13.975 in354.97 mm N/A 0.005 in0.13 mm N/A -383 N/A N/A O-rings are used in the military defense and agriculture industries.v
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