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
184193
N/A BS Standard O-Ring N/A Buna N/A 0.064 in1.63 mm N/A 70 N/A 0.301 in7.65 mm N/A 0.003 in0.08 mm N/A -903 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184194
N/A BS Standard O-Ring N/A Buna N/A 0.064 in1.63 mm N/A 90 N/A 0.301 in7.65 mm N/A 0.003 in0.08 mm N/A -903 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184195
N/A BS Standard O-Ring N/A Buna N/A 0.064 in1.63 mm N/A 70 N/A 0.239 in6.07 mm N/A 0.003 in0.08 mm N/A -902 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184196
N/A BS Standard O-Ring N/A Buna N/A 0.064 in1.63 mm N/A 90 N/A 0.239 in6.07 mm N/A 0.003 in0.08 mm N/A -902 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184197
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 7.875 in200.03 mm N/A 0.006 in0.15 mm N/A -886 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184198
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 7.875 in200.03 mm N/A 0.006 in0.15 mm N/A -886 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184199
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 7.625 in193.68 mm N/A 0.006 in0.15 mm N/A -884 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184200
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 7.625 in193.68 mm N/A 0.006 in0.15 mm N/A -884 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184201
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 7.375 in187.33 mm N/A 0.006 in0.15 mm N/A -882 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184202
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 7.375 in187.33 mm N/A 0.006 in0.15 mm N/A -882 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184203
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 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.
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
184205
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 6.875 in174.63 mm N/A 0.006 in0.15 mm N/A -878 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184206
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 6.875 in174.63 mm N/A 0.006 in0.15 mm N/A -878 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184207
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 6.625 in168.28 mm N/A 0.006 in0.15 mm N/A -876 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184208
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 6.625 in168.28 mm N/A 0.006 in0.15 mm N/A -876 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184209
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 6.375 in161.93 mm N/A 0.006 in0.15 mm N/A -874 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184210
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 6.375 in161.93 mm N/A 0.006 in0.15 mm N/A -874 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184211
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 70 N/A 6.125 in155.58 mm N/A 0.006 in0.15 mm N/A -872 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184212
N/A BS Standard O-Ring N/A Buna N/A 0.275 in6.99 mm N/A 90 N/A 6.125 in155.58 mm N/A 0.006 in0.15 mm N/A -872 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184213
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.875 in149.23 mm N/A 0.005 in0.13 mm N/A -870 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184214
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 90 N/A 5.875 in149.23 mm N/A 0.005 in0.13 mm N/A -870 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A
184215
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 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.
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
184217
N/A BS Standard O-Ring N/A Buna N/A 0.210 in5.33 mm N/A 70 N/A 5.625 in142.88 mm N/A 0.005 in0.13 mm N/A -868 N/A N/A O-rings are used in the military defense and agriculture industries.
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