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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
BS356 B-70 N/A
184593 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.350 in135.89 mm N/A 0.005 in0.13 mm N/A -356 N/A N/A O-rings are used in the military defense and agriculture industries.v
BS356 B-90 N/A
184594 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.350 in135.89 mm N/A 0.005 in0.13 mm N/A -356 N/A N/A O-rings are used in the military defense and agriculture industries.
BS355 B-70 N/A
184595 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.225 in132.72 mm N/A 0.005 in0.13 mm N/A -355 N/A N/A O-rings are used in the military defense and agriculture industries.
BS355 B-90 N/A
184596 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.225 in132.72 mm N/A 0.005 in0.13 mm N/A -355 N/A N/A O-rings are used in the military defense and agriculture industries.
BS354 B-70 N/A
184597 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.100 in129.54 mm N/A 0.005 in0.13 mm N/A -354 N/A N/A O-rings are used in the military defense and agriculture industries.
BS354 B-90 N/A
184598 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.100 in129.54 mm N/A 0.005 in0.13 mm N/A -354 N/A N/A O-rings are used in the military defense and agriculture industries.
BS353 B-70 N/A
184599 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.975 in126.37 mm N/A 0.005 in0.13 mm N/A -353 N/A N/A O-rings are used in the military defense and agriculture industries.
BS353 B-90 N/A
184600 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.975 in126.37 mm N/A 0.005 in0.13 mm N/A -353 N/A N/A O-rings are used in the military defense and agriculture industries.
BS352 B-70 N/A
184601 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.850 in123.19 mm N/A 0.005 in0.13 mm N/A -352 N/A N/A O-rings are used in the military defense and agriculture industries.
BS352 B-90 N/A
184602 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.850 in123.19 mm N/A 0.005 in0.13 mm N/A -352 N/A N/A O-rings are used in the military defense and agriculture industries.
BS351 B-70 N/A
184603 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.725 in120.02 mm N/A 0.005 in0.13 mm N/A -351 N/A N/A O-rings are used in the military defense and agriculture industries.
BS351 B-90 N/A
184604 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.725 in120.02 mm N/A 0.005 in0.13 mm N/A -351 N/A N/A O-rings are used in the military defense and agriculture industries.
BS350 B-70 N/A
184605 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.600 in116.84 mm N/A 0.005 in0.13 mm N/A -350 N/A N/A O-rings are used in the military defense and agriculture industries.
BS350 B-90 N/A
184606 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.600 in116.84 mm N/A 0.005 in0.13 mm N/A -350 N/A N/A O-rings are used in the military defense and agriculture industries.
BS349 B-70 N/A
184607 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.475 in113.67 mm N/A 0.005 in0.13 mm N/A -349 N/A N/A O-rings are used in the military defense and agriculture industries.v
BS349 B-90 N/A
184608 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.475 in113.67 mm N/A 0.005 in0.13 mm N/A -349 N/A N/A O-rings are used in the military defense and agriculture industries.
BS348 B-70 N/A
184609 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.350 in110.49 mm N/A 0.005 in0.13 mm N/A -348 N/A N/A O-rings are used in the military defense and agriculture industries.
BS348 B-90 N/A
184610 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.350 in110.49 mm N/A 0.005 in0.13 mm N/A -348 N/A N/A O-rings are used in the military defense and agriculture industries.
BS347 B-70 N/A
184611 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.225 in107.32 mm N/A 0.005 in0.13 mm N/A -347 N/A N/A O-rings are used in the military defense and agriculture industries.
BS347 B-90 N/A
184612 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.225 in107.32 mm N/A 0.005 in0.13 mm N/A -347 N/A N/A O-rings are used in the military defense and agriculture industries.
BS346 B-70 N/A
184613 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 4.100 in104.14 mm N/A 0.005 in0.13 mm N/A -346 N/A N/A O-rings are used in the military defense and agriculture industries.
BS346 B-90 N/A
184614 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 4.100 in104.14 mm N/A 0.005 in0.13 mm N/A -346 N/A N/A O-rings are used in the military defense and agriculture industries.
BS345 B-70 N/A
184615 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 3.975 in100.97 mm N/A 0.005 in0.13 mm N/A -345 N/A N/A O-rings are used in the military defense and agriculture industries.
BS345 B-90 N/A
184616 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 3.975 in100.97 mm N/A 0.005 in0.13 mm N/A -345 N/A N/A O-rings are used in the military defense and agriculture industries.
BS344 B-70 N/A
184617 		N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 3.850 in97.79 mm N/A 0.005 in0.13 mm N/A -344 N/A N/A O-rings are used in the military defense and agriculture industries.
Unit of Measure
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