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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.
BS O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Section Width

Durometer

Inside Diameter

CSW Tolerance

BS Number

Call for a Quote

O-Ring Industries

Quantity
BS369 B-90 N/A
184568 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 7.975 in202.57 mm N/A 0.005 in0.13 mm N/A -369 N/A N/A O-rings are used in the military defense and agriculture industries.
BS368 B-70 N/A
184569 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 7.725 in196.22 mm N/A 0.005 in0.13 mm N/A -368 N/A N/A O-rings are used in the military defense and agriculture industries.
BS368 B-90 N/A
184570 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 7.725 in196.22 mm N/A 0.005 in0.13 mm N/A -368 N/A N/A O-rings are used in the military defense and agriculture industries.
BS367 B-70 N/A
184571 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 7.475 in189.87 mm N/A 0.005 in0.13 mm N/A -367 N/A N/A O-rings are used in the military defense and agriculture industries.
BS367 B-90 N/A
184572 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 7.475 in189.87 mm N/A 0.005 in0.13 mm N/A -367 N/A N/A O-rings are used in the military defense and agriculture industries.
BS366 B-70 N/A
184573 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 7.225 in183.52 mm N/A 0.005 in0.13 mm N/A -366 N/A N/A O-rings are used in the military defense and agriculture industries.
BS366 B-90 N/A
184574 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 7.225 in183.52 mm N/A 0.005 in0.13 mm N/A -366 N/A N/A O-rings are used in the military defense and agriculture industries.
BS365 B-70 N/A
184575 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 6.975 in177.17 mm N/A 0.005 in0.13 mm N/A -365 N/A N/A O-rings are used in the military defense and agriculture industries.
BS365 B-90 N/A
184576 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 6.975 in177.17 mm N/A 0.005 in0.13 mm N/A -365 N/A N/A O-rings are used in the military defense and agriculture industries.
BS364 B-70 N/A
184577 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 6.725 in170.82 mm N/A 0.005 in0.13 mm N/A -364 N/A N/A O-rings are used in the military defense and agriculture industries.
BS364 B-90 N/A
184578 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 6.725 in170.82 mm N/A 0.005 in0.13 mm N/A -364 N/A N/A O-rings are used in the military defense and agriculture industries.
BS363 B-70 N/A
184579 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 6.475 in164.47 mm N/A 0.005 in0.13 mm N/A -363 N/A N/A O-rings are used in the military defense and agriculture industries.
BS363 B-90 N/A
184580 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 6.475 in164.47 mm N/A 0.005 in0.13 mm N/A -363 N/A N/A O-rings are used in the military defense and agriculture industries.
BS362 B-70 N/A
184581 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 6.225 in158.12 mm N/A 0.005 in0.13 mm N/A -362 N/A N/A O-rings are used in the military defense and agriculture industries.v
BS362 B-90 N/A
184582 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 6.225 in158.12 mm N/A 0.005 in0.13 mm N/A -362 N/A N/A O-rings are used in the military defense and agriculture industries.
BS361 B-70 N/A
184583 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.975 in151.77 mm N/A 0.005 in0.13 mm N/A -361 N/A N/A O-rings are used in the military defense and agriculture industries.
BS361 B-90 N/A
184584 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.975 in151.77 mm N/A 0.005 in0.13 mm N/A -361 N/A N/A O-rings are used in the military defense and agriculture industries.
BS360 B-70 N/A
184585 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.850 in148.59 mm N/A 0.005 in0.13 mm N/A -360 N/A N/A O-rings are used in the military defense and agriculture industries.
BS360 B-90 N/A
184586 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.850 in148.59 mm N/A 0.005 in0.13 mm N/A -360 N/A N/A O-rings are used in the military defense and agriculture industries.
BS359 B-70 N/A
184587 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.725 in145.42 mm N/A 0.005 in0.13 mm N/A -359 N/A N/A O-rings are used in the military defense and agriculture industries.
BS359 B-90 N/A
184588 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.725 in145.42 mm N/A 0.005 in0.13 mm N/A -359 N/A N/A O-rings are used in the military defense and agriculture industries.
BS358 B-70 N/A
184589 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.600 in142.24 mm N/A 0.005 in0.13 mm N/A -358 N/A N/A O-rings are used in the military defense and agriculture industries.
BS358 B-90 N/A
184590 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.600 in142.24 mm N/A 0.005 in0.13 mm N/A -358 N/A N/A O-rings are used in the military defense and agriculture industries.
BS357 B-70 N/A
184591 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.475 in139.07 mm N/A 0.005 in0.13 mm N/A -357 N/A N/A O-rings are used in the military defense and agriculture industries.
BS357 B-90 N/A
184592 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.475 in139.07 mm N/A 0.005 in0.13 mm N/A -357 N/A N/A O-rings are used in the military defense and agriculture industries.
Unit of Measure
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