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.

This elastomer possesses mechanical properties similar to Viton®, with the exception of its slightly lower compression set resistance. It is more suitable for sensitive applications where lighter compressive forces are applied to energize the seal. This core has a Shore A hardness of 70 but it also offers a broader operating temperature range of -80°F to +500°F. (-62°C to +260°C).
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Cross Section Width (in)

Cross Section Width (mm)

Inside Diameter (in)

Inside Diameter (mm)

Item #

IntegrationID

Type

Material

Cross Section Width

Durometer

Inside Diameter

CSW Tolerance

BS Number

BS903 S-70 N/A
186045
N/A BS Standard O-Ring N/A Silicone 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
BS902 S-70 N/A
186046
N/A BS Standard O-Ring N/A Silicone 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
BS886 S-70 N/A
186047
N/A BS Standard O-Ring N/A Silicone 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
BS884 S-70 N/A
186048
N/A BS Standard O-Ring N/A Silicone 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
BS882 S-70 N/A
186049
N/A BS Standard O-Ring N/A Silicone 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
BS880 S-70 N/A
186050
N/A BS Standard O-Ring N/A Silicone 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
BS878 S-70 N/A
186051
N/A BS Standard O-Ring N/A Silicone 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
BS876 S-70 N/A
186052
N/A BS Standard O-Ring N/A Silicone 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
BS874 S-70 N/A
186053
N/A BS Standard O-Ring N/A Silicone 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
BS872 S-70 N/A
186054
N/A BS Standard O-Ring N/A Silicone 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
BS870 S-70 N/A
186055
N/A BS Standard O-Ring N/A Silicone 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
BS869 S-70 N/A
186056
N/A BS Standard O-Ring N/A Silicone 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
BS868 S-70 N/A
186057
N/A BS Standard O-Ring N/A Silicone 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
BS867 S-70 N/A
186058
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 5.5 in139.70 mm N/A 0.005 in0.13 mm N/A -867
BS866 S-70 N/A
186059
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 5.375 in136.53 mm N/A 0.005 in0.13 mm N/A -866
BS865 S-70 N/A
186060
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 5.25 in133.35 mm N/A 0.005 in0.13 mm N/A -865
BS864 S-70 N/A
186061
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 5.125 in130.18 mm N/A 0.005 in0.13 mm N/A -864
BS863 S-70 N/A
186062
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 5.000 in127.00 mm N/A 0.005 in0.13 mm N/A -863
BS862 S-70 N/A
186063
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 4.875 in123.83 mm N/A 0.005 in0.13 mm N/A -862
BS861 S-70 N/A
186064
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 4.75 in120.65 mm N/A 0.005 in0.13 mm N/A -861
BS860 S-70 N/A
186065
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 4.625 in117.48 mm N/A 0.005 in0.13 mm N/A -860
BS846 S-70 N/A
186066
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.937 in74.60 mm N/A 0.004 in0.10 mm N/A -846
BS845 S-70 N/A
186067
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.875 in73.03 mm N/A 0.004 in0.10 mm N/A -845
BS844 S-70 N/A
186068
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.813 in71.44 mm N/A 0.004 in0.10 mm N/A -844
BS843 S-70 N/A
186069
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.75 in69.85 mm N/A 0.004 in0.10 mm N/A -843
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