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. Polyurethane is also known as urethane, cast urethan and millable urethane.

Polyurethane is also known as urethane, cast urethan and millable urethane. Exceptional tensile strength. Abrasion and low temperature resistance. Typical applications include hydraulic seals, gaskets, diaphragms, hoses, and wheels for skate boards.

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Inside Diamter (in)

Inside Diamter (mm)

Cross Section Width (in)

Cross Section Width (mm)

Durometer

70 90

Item #

Inside Diamter

Cross Section Width

Durometer

CSW Tolerance

BS Number

N/A 0.301 in7.65 mm N/A 0.064 in1.63 mm N/A 70 N/A 0.003 in0.08 mm N/A -903
N/A 0.301 in7.65 mm N/A 0.064 in1.63 mm N/A 90 N/A 0.003 in0.08 mm N/A -903
N/A 0.239 in6.07 mm N/A 0.064 in1.63 mm N/A 70 N/A 0.003 in0.08 mm N/A -902
N/A 0.239 in6.07 mm N/A 0.064 in1.63 mm N/A 90 N/A 0.003 in0.08 mm N/A -902
N/A 7.875 in200.03 mm N/A 0.275 in6.99 mm N/A 70 N/A 0.006 in0.15 mm N/A -886
N/A 7.875 in200.03 mm N/A 0.275 in6.99 mm N/A 90 N/A 0.006 in0.15 mm N/A -886
N/A 7.625 in193.68 mm N/A 0.275 in6.99 mm N/A 70 N/A 0.006 in0.15 mm N/A -884
N/A 7.625 in193.68 mm N/A 0.275 in6.99 mm N/A 90 N/A 0.006 in0.15 mm N/A -884
N/A 7.375 in187.33 mm N/A 0.275 in6.99 mm N/A 70 N/A 0.006 in0.15 mm N/A -882
N/A 7.375 in187.33 mm N/A 0.275 in6.99 mm N/A 90 N/A 0.006 in0.15 mm N/A -882
N/A 7.125 in180.98 mm N/A 0.275 in6.99 mm N/A 70 N/A 0.006 in0.15 mm N/A -880
N/A 7.125 in180.98 mm N/A 0.275 in6.99 mm N/A 90 N/A 0.006 in0.15 mm N/A -880
N/A 6.875 in174.63 mm N/A 0.275 in6.99 mm N/A 70 N/A 0.006 in0.15 mm N/A -878
N/A 6.875 in174.63 mm N/A 0.275 in6.99 mm N/A 90 N/A 0.006 in0.15 mm N/A -878
N/A 6.625 in168.28 mm N/A 0.275 in6.99 mm N/A 70 N/A 0.006 in0.15 mm N/A -876
N/A 6.625 in168.28 mm N/A 0.275 in6.99 mm N/A 90 N/A 0.006 in0.15 mm N/A -876
N/A 6.375 in161.93 mm N/A 0.275 in6.99 mm N/A 70 N/A 0.006 in0.15 mm N/A -874
N/A 6.375 in161.93 mm N/A 0.275 in6.99 mm N/A 90 N/A 0.006 in0.15 mm N/A -874
N/A 6.125 in155.58 mm N/A 0.275 in6.99 mm N/A 70 N/A 0.006 in0.15 mm N/A -872
N/A 6.125 in155.58 mm N/A 0.275 in6.99 mm N/A 90 N/A 0.006 in0.15 mm N/A -872
N/A 5.875 in149.23 mm N/A 0.210 in5.33 mm N/A 70 N/A 0.005 in0.13 mm N/A -870
N/A 5.875 in149.23 mm N/A 0.210 in5.33 mm N/A 90 N/A 0.005 in0.13 mm N/A -870
N/A 5.75 in146.05 mm N/A 0.210 in5.33 mm N/A 70 N/A 0.005 in0.13 mm N/A -869
N/A 5.75 in146.05 mm N/A 0.210 in5.33 mm N/A 90 N/A 0.005 in0.13 mm N/A -869
N/A 5.625 in142.88 mm N/A 0.210 in5.33 mm N/A 70 N/A 0.005 in0.13 mm N/A -868
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