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BS 4518 Metric O-Rings

BS 4518 Metric O-Rings

Issued by the British Standards Institution, Standard BS 4518 identifies British Standard metric sizes. The size code for these O-Rings is a four digit number indicating the O-Ring I.D. in tenths of millimeters followed by a hyphen and two digits indicating the O-Ring Cross Section, also in tenths of a millimeter.
For a complete listing of all metric o-ring sizes, visit our
Metric O-Ring Cross Reference Table.

BS 4518 Size Chart

Global Part#ReferenceC/S (MM)I.D. (MM)C/S (Inch)I.D. (Inch)
1.60X003.10031-161.63.10.0630.122
1.60X004.10041-161.64.10.0630.161
1.60X005.10051-161.65.10.0630.201
1.60X006.10061-161.66.10.0630.24
1.60X007.10071-161.67.10.0630.28
1.60X008.10081-161.68.10.0630.319
1.60X009.10091-161.69.10.0630.358
1.60X010.10101-161.610.10.0630.398
1.60X011.10111-161.611.10.0630.437
1.60X012.10121-161.612.10.0630.476
1.60X013.10131-161.613.10.0630.516
1.60X014.10141-161.614.10.0630.555
1.60X015.10151-161.615.10.0630.594
1.60X016.10161-161.616.10.0630.634
1.60X017.10171-161.617.10.0630.673
1.60X018.10181-161.618.10.0630.713
1.60X019.10191-161.619.10.0630.752
1.60X020.10201-161.620.10.0630.791
1.60X021.10211-161.621.10.0630.831
1.60X022.10221-161.622.10.0630.87
1.60X025.10251-161.625.10.0630.988
1.60X027.10271-161.627.10.0631.067
1.60X029.10291-161.629.10.0631.146
1.60X032.10321-161.632.10.0631.264
1.60X035.10351-161.635.10.0631.382
1.60X037.10371-161.637.10.0631.461
2.40X003.60036-242.43.60.0940.142
2.40X004.60046-242.44.60.0940.181
2.40X005.60056-242.45.60.0940.22
2.40X006.60066-242.46.60.0940.26
2.40X007.60076-242.47.60.0940.299
2.40X008.60086-242.48.60.0940.339
2.40X009.60096-242.49.60.0940.378
2.40X010.60106-242.410.60.0940.417
2.40X011.60116-242.411.60.0940.457
2.40X012.60126-242.412.60.0940.496
2.40X013.60136-242.413.60.0940.535
2.40X014.60146-242.414.60.0940.575
2.40X015.60156-242.415.60.0940.614
2.40X016.60166-242.416.60.0940.654
2.40X017.60176-242.417.60.0940.693
2.40X018.60186-242.418.60.0940.732
2.40X019.60196-242.419.60.0940.772
2.40X020.60206-242.420.60.0940.811
2.40X021.60216-242.421.60.0940.85
2.40X024.60246-242.424.60.0940.969
2.40X027.60276-242.427.60.0941.087
2.40X029.60296-242.429.60.0941.165
2.40X031.60316-242.431.60.0941.244
2.40X034.60346-242.434.60.0941.362
2.40X035.60356-242.435.60.0941.402
2.40X037.60376-242.437.60.0941.48
2.40X039.60396-242.439.60.0941.559
2.40X041.60416-242.441.60.0941.638
2.40X044.60446-242.444.60.0941.756
2.40X045.60456-242.445.60.0941.795
2.40X047.60476-242.447.60.0941.874
2.40X049.60496-242.449.60.0941.953
2.40X051.60516-242.451.60.0942.031
2.40X054.60546-242.454.60.0942.15
2.40X055.60556-242.455.60.0942.189
2.40X057.60576-242.457.60.0942.268
2.40X058.60586-242.458.60.0942.307
2.40X059.60596-242.459.60.0942.346
2.40X061.60616-242.461.60.0942.425
2.40X062.60626-242.462.60.0942.465
2.40X064.60646-242.464.60.0942.543
2.40X067.60676-242.467.60.0942.661
2.40X069.60696-242.469.60.0942.74
3.00X019.50195-30319.50.1180.768
3.00X021.50215-30321.50.1180.846
3.00X022.50225-30322.50.1180.886
3.00X024.50245-30324.50.1180.965
3.00X025.50255-30325.50.1181.004
3.00X026.50265-30326.50.1181.043
3.00X027.50275-30327.50.1181.083
3.00X029.50295-30329.50.1181.161
3.00X031.50315-30331.50.1181.24
3.00X032.50325-30332.50.1181.28
3.00X034.50345-30334.50.1181.358
3.00X035.50355-30335.50.1181.398
3.00X036.50365-30336.50.1181.437
3.00X037.50375-30337.50.1181.476
3.00X039.50395-30339.50.1181.555
3.00X041.50415-30341.50.1181.634
3.00X042.50425-30342.50.1181.673
3.00X044.50445-30344.50.1181.752
3.00X049.50495-30349.50.1181.949
3.00X054.50545-30354.50.1182.146
3.00X055.50555-30355.50.1182.185
3.00X057.50575-30357.50.1182.264
3.00X059.50595-30359.50.1182.343
3.00X062.50625-30362.50.1182.461
3.00X064.50645-30364.50.1182.539
3.00X069.50695-30369.50.1182.736
3.00X074.50745-30374.50.1182.933
3.00X079.50795-30379.50.1183.13
3.00X084.50845-30384.50.1183.327
3.00X089.50895-30389.50.1183.524
3.00X094.50945-30394.50.1183.72
3.00X099.50995-30399.50.1183.917
3.00X104.51045-303104.50.1184.114
3.00X109.51095-303109.50.1184.311
3.00X114.51145-303114.50.1184.508
3.00X119.51195-303119.50.1184.705
3.00X124.51245-303124.50.1184.902
3.00X129.51295-303129.50.1185.098
3.00X134.51345-303134.50.1185.295
3.00X139.51395-303139.50.1185.492
3.00X144.51445-303144.50.1185.689
3.00X149.51495-303149.50.1185.886
3.00X154.51545-303154.50.1186.083
3.00X159.51595-303159.50.1186.28
3.00X164.51645-303164.50.1186.476
3.00X169.51695-303169.50.1186.673
3.00X174.51745-303174.50.1186.87
3.00X179.51795-303179.50.1187.067
3.00X184.51845-303184.50.1187.264
3.00X189.51895-303189.50.1187.461
3.00X194.51945-303194.50.1187.657
3.00X199.51995-303199.50.1187.854
3.00X209.52095-303209.50.1188.248
3.00X219.52195-303219.50.1188.642
3.00X229.52295-303229.50.1189.035
3.00X239.52395-303239.50.1189.429
3.00X244.52445-303244.50.1189.626
3.00X249.52495-303249.50.1189.823
5.70X044.30443-575.744.30.2241.744
5.70X045.30453-575.745.30.2241.783
5.70X049.30493-575.749.30.2241.941
5.70X052.30523-575.752.30.2242.059
5.70X054.30543-575.754.30.2242.138
5.70X055.30553-575.755.30.2242.177
5.70X059.30593-575.759.30.2242.335
5.70X062.30623-575.762.30.2242.453
5.70X064.30643-575.764.30.2242.531
5.70X069.30693-575.769.30.2242.728
5.70X074.30743-575.774.30.2242.925
5.70X079.30793-575.779.30.2243.122
5.70X084.30843-575.784.30.2243.319
5.70X089.30893-575.789.30.2243.516
5.70X094.30943-575.794.30.2243.713
5.70X099.30993-575.799.30.2243.909
5.70X104.31043-575.7104.30.2244.106
5.70X109.31093-575.7109.30.2244.303
5.70X114.31143-575.7114.30.2244.5
5.70X119.31193-575.7119.30.2244.697
5.70X124.31243-575.7124.30.2244.894
5.70X129.31293-575.7129.30.2245.091
5.70X134.31343-575.7134.30.2245.287
5.70X139.31393-575.7139.30.2245.484
5.70X144.31443-575.7144.30.2245.681
5.70X149.31493-575.7149.30.2245.878
5.70X154.31543-575.7154.30.2246.075
5.70X159.31593-575.7159.30.2246.272
5.70X164.31643-575.7164.30.2246.469
5.70X169.31693-575.7169.30.2246.665
5.70X174.31743-575.7174.30.2246.862
5.70X179.31793-575.7179.30.2247.059
5.70X184.31843-575.7184.30.2247.256
5.70X189.31893-575.7189.30.2247.453
5.70X194.31943-575.7194.30.2247.65
5.70X199.31993-575.7199.30.2247.846
5.70X209.32093-575.7209.30.2248.24
5.70X219.32193-575.7219.30.2248.634
5.70X229.32293-575.7229.30.2249.028
5.70X239.32393-575.7239.30.2249.421
5.70X249.32493-575.7249.30.2249.815
5.70X259.32593-575.7259.30.22410.209
5.70X269.32693-575.7269.30.22410.602
5.70X279.32793-575.7279.30.22410.996
5.70X289.32893-575.7289.30.22411.39
5.70X299.32993-575.7299.30.22411.783
5.70X309.33093-575.7309.30.22412.177
5.70X319.33193-575.7319.30.22412.571
5.70X339.33393-575.7339.30.22413.358
5.70X359.33593-575.7359.30.22414.146
5.70X379.33793-575.7379.30.22414.933
5.70X389.33893-575.7389.30.22415.327
5.70X399.33993-575.7399.30.22415.72
5.70X419.34193-575.7419.30.22416.508
5.70X439.34393-575.7439.30.22417.295
5.70X459.34593-575.7459.30.22418.083
5.70X479.34793-575.7479.30.22418.87
5.70X489.34893-575.7489.30.22419.264
5.70X499.34993-575.7499.30.22419.657
8.40X144.11441-848.4144.10.3315.673
8.40X149.11491-848.4149.10.3315.87
8.40X154.11541-848.4154.10.3316.067
8.40X159.11591-848.4159.10.3316.264
8.40X164.11641-848.4164.10.3316.461
8.40X169.11691-848.4169.10.3316.657
8.40X174.11741-848.4174.10.3316.854
8.40X179.11791-848.4179.10.3317.051
8.40X184.11841-848.4184.10.3317.248
8.40X189.11891-848.4189.10.3317.445
8.40X194.11941-848.4194.10.3317.642
8.40X199.11991-848.4199.10.3317.839
8.40X204.12041-848.4204.10.3318.035
8.40X209.12091-848.4209.10.3318.232
8.40X219.12191-848.4219.10.3318.626
8.40X229.12291-848.4229.10.3319.02
8.40X234.12341-848.4234.10.3319.217
8.40X239.12391-848.4239.10.3319.413
8.40X249.12491-848.4249.10.3319.807
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