BS309 to BS395

BS309 to BS395

Imperial / Inch sizes of Nitrile (NBR, Buna N) O-rings.  These sizes are usually looked up by a size code e.g. BS316 or AS316.  The size codes are as follows:

Size code O-ring cross section
-309 to -395 5.33


​Remember to check media compatibility using our Chemical Compatibility Guide.

More information:
O-ring material data sheet - Nitrile 70
O-ring Housing dimensions
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Article No. OD ID CS Ref. Material
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BS309-N70 21.12 10.46 5.33 309 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.20 £0.11 £0.10 £0.07 £0.06 £0.05 £0.04 CALL
BS310-N70 22.73 12.07 5.33 310 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.20 £0.11 £0.10 £0.07 £0.06 £0.05 £0.04 CALL
BS311-N70 24.3 13.64 5.33 311 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.20 £0.11 £0.10 £0.07 £0.06 £0.05 £0.04 CALL
BS312-N70 25.9 15.24 5.33 312 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.22 £0.12 £0.11 £0.08 £0.07 £0.06 £0.05 CALL
BS313-N70 27.47 16.81 5.33 313 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.22 £0.12 £0.11 £0.08 £0.07 £0.06 £0.05 CALL
BS314-N70 29.08 18.42 5.33 314 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.22 £0.12 £0.11 £0.08 £0.07 £0.06 £0.05 CALL
BS315-N70 30.65 19.99 5.33 315 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.22 £0.12 £0.11 £0.08 £0.07 £0.06 £0.05 CALL
BS316-N70 32.25 21.59 5.33 316 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.22 £0.12 £0.11 £0.08 £0.07 £0.06 £0.05 CALL
BS317-N70 33.82 23.16 5.33 317 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.22 £0.12 £0.11 £0.08 £0.07 £0.06 £0.05 CALL
BS318-N70 35.43 24.77 5.33 318 Nitrile 70 10+ 25+ 50+ 100+ 250+ 500+ 1000+ MORE
£0.23 £0.13 £0.12 £0.10 £0.08 £0.07 £0.06 CALL
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