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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
BS145 B-90 N/A
184918 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.550 in64.77 mm N/A 0.003 in0.08 mm N/A -145 N/A N/A O-rings are used in the military defense and agriculture industries.
BS144 B-70 N/A
184919 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.487 in63.17 mm N/A 0.003 in0.08 mm N/A -144 N/A N/A O-rings are used in the military defense and agriculture industries.
BS144 B-90 N/A
184920 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.487 in63.17 mm N/A 0.003 in0.08 mm N/A -144 N/A N/A O-rings are used in the military defense and agriculture industries.
BS143 B-70 N/A
184921 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.425 in61.60 mm N/A 0.003 in0.08 mm N/A -143 N/A N/A O-rings are used in the military defense and agriculture industries.
BS143 B-90 N/A
184922 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.425 in61.60 mm N/A 0.003 in0.08 mm N/A -143 N/A N/A O-rings are used in the military defense and agriculture industries.
BS142 B-70 N/A
184923 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.362 in59.99 mm N/A 0.003 in0.08 mm N/A -142 N/A N/A O-rings are used in the military defense and agriculture industries.
BS142 B-90 N/A
184924 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.362 in59.99 mm N/A 0.003 in0.08 mm N/A -142 N/A N/A O-rings are used in the military defense and agriculture industries.
BS141 B-70 N/A
184925 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.300 in58.42 mm N/A 0.003 in0.08 mm N/A -141 N/A N/A O-rings are used in the military defense and agriculture industries.
BS141 B-90 N/A
184926 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.300 in58.42 mm N/A 0.003 in0.08 mm N/A -141 N/A N/A O-rings are used in the military defense and agriculture industries.
BS140 B-70 N/A
184927 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.237 in56.82 mm N/A 0.003 in0.08 mm N/A -140 N/A N/A O-rings are used in the military defense and agriculture industries.
BS140 B-90 N/A
184928 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.237 in56.82 mm N/A 0.003 in0.08 mm N/A -140 N/A N/A O-rings are used in the military defense and agriculture industries.
BS139 B-70 N/A
184929 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.175 in55.25 mm N/A 0.003 in0.08 mm N/A -139 N/A N/A O-rings are used in the military defense and agriculture industries.v
BS139 B-90 N/A
184930 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.175 in55.25 mm N/A 0.003 in0.08 mm N/A -139 N/A N/A O-rings are used in the military defense and agriculture industries.
BS138 B-70 N/A
184931 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.112 in53.64 mm N/A 0.003 in0.08 mm N/A -138 N/A N/A O-rings are used in the military defense and agriculture industries.
BS138 B-90 N/A
184932 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.112 in53.64 mm N/A 0.003 in0.08 mm N/A -138 N/A N/A O-rings are used in the military defense and agriculture industries.
BS137 B-70 N/A
184933 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 2.050 in52.07 mm N/A 0.003 in0.08 mm N/A -137 N/A N/A O-rings are used in the military defense and agriculture industries.
BS137 B-90 N/A
184934 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 2.050 in52.07 mm N/A 0.003 in0.08 mm N/A -137 N/A N/A O-rings are used in the military defense and agriculture industries.
BS136 B-70 N/A
184935 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 1.987 in50.47 mm N/A 0.003 in0.08 mm N/A -136 N/A N/A O-rings are used in the military defense and agriculture industries.
BS136 B-90 N/A
184936 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 1.987 in50.47 mm N/A 0.003 in0.08 mm N/A -136 N/A N/A O-rings are used in the military defense and agriculture industries.
BS135 B-70 N/A
184937 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 1.925 in48.90 mm N/A 0.003 in0.08 mm N/A -135 N/A N/A O-rings are used in the military defense and agriculture industries.
BS135 B-90 N/A
184938 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 1.925 in48.90 mm N/A 0.003 in0.08 mm N/A -135 N/A N/A O-rings are used in the military defense and agriculture industries.
BS134 B-70 N/A
184939 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 1.862 in47.29 mm N/A 0.003 in0.08 mm N/A -134 N/A N/A O-rings are used in the military defense and agriculture industries.
BS134 B-90 N/A
184940 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 1.862 in47.29 mm N/A 0.003 in0.08 mm N/A -134 N/A N/A O-rings are used in the military defense and agriculture industries.
BS133 B-70 N/A
184941 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 70 N/A 1.799 in45.69 mm N/A 0.003 in0.08 mm N/A -133 N/A N/A O-rings are used in the military defense and agriculture industries.
BS133 B-90 N/A
184942 		N/A BS Standard O-Ring N/A Buna N/A 0.103 in2.62 mm N/A 90 N/A 1.799 in45.69 mm N/A 0.003 in0.08 mm N/A -133 N/A N/A O-rings are used in the military defense and agriculture industries.
Unit of Measure
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