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# | Reference | C/S (MM) | I.D. (MM) | C/S (Inch) | I.D. (Inch) |
|---|---|---|---|---|---|
| 1.60X003.1 | 0031-16 | 1.6 | 3.1 | 0.063 | 0.122 |
| 1.60X004.1 | 0041-16 | 1.6 | 4.1 | 0.063 | 0.161 |
| 1.60X005.1 | 0051-16 | 1.6 | 5.1 | 0.063 | 0.201 |
| 1.60X006.1 | 0061-16 | 1.6 | 6.1 | 0.063 | 0.24 |
| 1.60X007.1 | 0071-16 | 1.6 | 7.1 | 0.063 | 0.28 |
| 1.60X008.1 | 0081-16 | 1.6 | 8.1 | 0.063 | 0.319 |
| 1.60X009.1 | 0091-16 | 1.6 | 9.1 | 0.063 | 0.358 |
| 1.60X010.1 | 0101-16 | 1.6 | 10.1 | 0.063 | 0.398 |
| 1.60X011.1 | 0111-16 | 1.6 | 11.1 | 0.063 | 0.437 |
| 1.60X012.1 | 0121-16 | 1.6 | 12.1 | 0.063 | 0.476 |
| 1.60X013.1 | 0131-16 | 1.6 | 13.1 | 0.063 | 0.516 |
| 1.60X014.1 | 0141-16 | 1.6 | 14.1 | 0.063 | 0.555 |
| 1.60X015.1 | 0151-16 | 1.6 | 15.1 | 0.063 | 0.594 |
| 1.60X016.1 | 0161-16 | 1.6 | 16.1 | 0.063 | 0.634 |
| 1.60X017.1 | 0171-16 | 1.6 | 17.1 | 0.063 | 0.673 |
| 1.60X018.1 | 0181-16 | 1.6 | 18.1 | 0.063 | 0.713 |
| 1.60X019.1 | 0191-16 | 1.6 | 19.1 | 0.063 | 0.752 |
| 1.60X020.1 | 0201-16 | 1.6 | 20.1 | 0.063 | 0.791 |
| 1.60X021.1 | 0211-16 | 1.6 | 21.1 | 0.063 | 0.831 |
| 1.60X022.1 | 0221-16 | 1.6 | 22.1 | 0.063 | 0.87 |
| 1.60X025.1 | 0251-16 | 1.6 | 25.1 | 0.063 | 0.988 |
| 1.60X027.1 | 0271-16 | 1.6 | 27.1 | 0.063 | 1.067 |
| 1.60X029.1 | 0291-16 | 1.6 | 29.1 | 0.063 | 1.146 |
| 1.60X032.1 | 0321-16 | 1.6 | 32.1 | 0.063 | 1.264 |
| 1.60X035.1 | 0351-16 | 1.6 | 35.1 | 0.063 | 1.382 |
| 1.60X037.1 | 0371-16 | 1.6 | 37.1 | 0.063 | 1.461 |
| 2.40X003.6 | 0036-24 | 2.4 | 3.6 | 0.094 | 0.142 |
| 2.40X004.6 | 0046-24 | 2.4 | 4.6 | 0.094 | 0.181 |
| 2.40X005.6 | 0056-24 | 2.4 | 5.6 | 0.094 | 0.22 |
| 2.40X006.6 | 0066-24 | 2.4 | 6.6 | 0.094 | 0.26 |
| 2.40X007.6 | 0076-24 | 2.4 | 7.6 | 0.094 | 0.299 |
| 2.40X008.6 | 0086-24 | 2.4 | 8.6 | 0.094 | 0.339 |
| 2.40X009.6 | 0096-24 | 2.4 | 9.6 | 0.094 | 0.378 |
| 2.40X010.6 | 0106-24 | 2.4 | 10.6 | 0.094 | 0.417 |
| 2.40X011.6 | 0116-24 | 2.4 | 11.6 | 0.094 | 0.457 |
| 2.40X012.6 | 0126-24 | 2.4 | 12.6 | 0.094 | 0.496 |
| 2.40X013.6 | 0136-24 | 2.4 | 13.6 | 0.094 | 0.535 |
| 2.40X014.6 | 0146-24 | 2.4 | 14.6 | 0.094 | 0.575 |
| 2.40X015.6 | 0156-24 | 2.4 | 15.6 | 0.094 | 0.614 |
| 2.40X016.6 | 0166-24 | 2.4 | 16.6 | 0.094 | 0.654 |
| 2.40X017.6 | 0176-24 | 2.4 | 17.6 | 0.094 | 0.693 |
| 2.40X018.6 | 0186-24 | 2.4 | 18.6 | 0.094 | 0.732 |
| 2.40X019.6 | 0196-24 | 2.4 | 19.6 | 0.094 | 0.772 |
| 2.40X020.6 | 0206-24 | 2.4 | 20.6 | 0.094 | 0.811 |
| 2.40X021.6 | 0216-24 | 2.4 | 21.6 | 0.094 | 0.85 |
| 2.40X024.6 | 0246-24 | 2.4 | 24.6 | 0.094 | 0.969 |
| 2.40X027.6 | 0276-24 | 2.4 | 27.6 | 0.094 | 1.087 |
| 2.40X029.6 | 0296-24 | 2.4 | 29.6 | 0.094 | 1.165 |
| 2.40X031.6 | 0316-24 | 2.4 | 31.6 | 0.094 | 1.244 |
| 2.40X034.6 | 0346-24 | 2.4 | 34.6 | 0.094 | 1.362 |
| 2.40X035.6 | 0356-24 | 2.4 | 35.6 | 0.094 | 1.402 |
| 2.40X037.6 | 0376-24 | 2.4 | 37.6 | 0.094 | 1.48 |
| 2.40X039.6 | 0396-24 | 2.4 | 39.6 | 0.094 | 1.559 |
| 2.40X041.6 | 0416-24 | 2.4 | 41.6 | 0.094 | 1.638 |
| 2.40X044.6 | 0446-24 | 2.4 | 44.6 | 0.094 | 1.756 |
| 2.40X045.6 | 0456-24 | 2.4 | 45.6 | 0.094 | 1.795 |
| 2.40X047.6 | 0476-24 | 2.4 | 47.6 | 0.094 | 1.874 |
| 2.40X049.6 | 0496-24 | 2.4 | 49.6 | 0.094 | 1.953 |
| 2.40X051.6 | 0516-24 | 2.4 | 51.6 | 0.094 | 2.031 |
| 2.40X054.6 | 0546-24 | 2.4 | 54.6 | 0.094 | 2.15 |
| 2.40X055.6 | 0556-24 | 2.4 | 55.6 | 0.094 | 2.189 |
| 2.40X057.6 | 0576-24 | 2.4 | 57.6 | 0.094 | 2.268 |
| 2.40X058.6 | 0586-24 | 2.4 | 58.6 | 0.094 | 2.307 |
| 2.40X059.6 | 0596-24 | 2.4 | 59.6 | 0.094 | 2.346 |
| 2.40X061.6 | 0616-24 | 2.4 | 61.6 | 0.094 | 2.425 |
| 2.40X062.6 | 0626-24 | 2.4 | 62.6 | 0.094 | 2.465 |
| 2.40X064.6 | 0646-24 | 2.4 | 64.6 | 0.094 | 2.543 |
| 2.40X067.6 | 0676-24 | 2.4 | 67.6 | 0.094 | 2.661 |
| 2.40X069.6 | 0696-24 | 2.4 | 69.6 | 0.094 | 2.74 |
| 3.00X019.5 | 0195-30 | 3 | 19.5 | 0.118 | 0.768 |
| 3.00X021.5 | 0215-30 | 3 | 21.5 | 0.118 | 0.846 |
| 3.00X022.5 | 0225-30 | 3 | 22.5 | 0.118 | 0.886 |
| 3.00X024.5 | 0245-30 | 3 | 24.5 | 0.118 | 0.965 |
| 3.00X025.5 | 0255-30 | 3 | 25.5 | 0.118 | 1.004 |
| 3.00X026.5 | 0265-30 | 3 | 26.5 | 0.118 | 1.043 |
| 3.00X027.5 | 0275-30 | 3 | 27.5 | 0.118 | 1.083 |
| 3.00X029.5 | 0295-30 | 3 | 29.5 | 0.118 | 1.161 |
| 3.00X031.5 | 0315-30 | 3 | 31.5 | 0.118 | 1.24 |
| 3.00X032.5 | 0325-30 | 3 | 32.5 | 0.118 | 1.28 |
| 3.00X034.5 | 0345-30 | 3 | 34.5 | 0.118 | 1.358 |
| 3.00X035.5 | 0355-30 | 3 | 35.5 | 0.118 | 1.398 |
| 3.00X036.5 | 0365-30 | 3 | 36.5 | 0.118 | 1.437 |
| 3.00X037.5 | 0375-30 | 3 | 37.5 | 0.118 | 1.476 |
| 3.00X039.5 | 0395-30 | 3 | 39.5 | 0.118 | 1.555 |
| 3.00X041.5 | 0415-30 | 3 | 41.5 | 0.118 | 1.634 |
| 3.00X042.5 | 0425-30 | 3 | 42.5 | 0.118 | 1.673 |
| 3.00X044.5 | 0445-30 | 3 | 44.5 | 0.118 | 1.752 |
| 3.00X049.5 | 0495-30 | 3 | 49.5 | 0.118 | 1.949 |
| 3.00X054.5 | 0545-30 | 3 | 54.5 | 0.118 | 2.146 |
| 3.00X055.5 | 0555-30 | 3 | 55.5 | 0.118 | 2.185 |
| 3.00X057.5 | 0575-30 | 3 | 57.5 | 0.118 | 2.264 |
| 3.00X059.5 | 0595-30 | 3 | 59.5 | 0.118 | 2.343 |
| 3.00X062.5 | 0625-30 | 3 | 62.5 | 0.118 | 2.461 |
| 3.00X064.5 | 0645-30 | 3 | 64.5 | 0.118 | 2.539 |
| 3.00X069.5 | 0695-30 | 3 | 69.5 | 0.118 | 2.736 |
| 3.00X074.5 | 0745-30 | 3 | 74.5 | 0.118 | 2.933 |
| 3.00X079.5 | 0795-30 | 3 | 79.5 | 0.118 | 3.13 |
| 3.00X084.5 | 0845-30 | 3 | 84.5 | 0.118 | 3.327 |
| 3.00X089.5 | 0895-30 | 3 | 89.5 | 0.118 | 3.524 |
| 3.00X094.5 | 0945-30 | 3 | 94.5 | 0.118 | 3.72 |
| 3.00X099.5 | 0995-30 | 3 | 99.5 | 0.118 | 3.917 |
| 3.00X104.5 | 1045-30 | 3 | 104.5 | 0.118 | 4.114 |
| 3.00X109.5 | 1095-30 | 3 | 109.5 | 0.118 | 4.311 |
| 3.00X114.5 | 1145-30 | 3 | 114.5 | 0.118 | 4.508 |
| 3.00X119.5 | 1195-30 | 3 | 119.5 | 0.118 | 4.705 |
| 3.00X124.5 | 1245-30 | 3 | 124.5 | 0.118 | 4.902 |
| 3.00X129.5 | 1295-30 | 3 | 129.5 | 0.118 | 5.098 |
| 3.00X134.5 | 1345-30 | 3 | 134.5 | 0.118 | 5.295 |
| 3.00X139.5 | 1395-30 | 3 | 139.5 | 0.118 | 5.492 |
| 3.00X144.5 | 1445-30 | 3 | 144.5 | 0.118 | 5.689 |
| 3.00X149.5 | 1495-30 | 3 | 149.5 | 0.118 | 5.886 |
| 3.00X154.5 | 1545-30 | 3 | 154.5 | 0.118 | 6.083 |
| 3.00X159.5 | 1595-30 | 3 | 159.5 | 0.118 | 6.28 |
| 3.00X164.5 | 1645-30 | 3 | 164.5 | 0.118 | 6.476 |
| 3.00X169.5 | 1695-30 | 3 | 169.5 | 0.118 | 6.673 |
| 3.00X174.5 | 1745-30 | 3 | 174.5 | 0.118 | 6.87 |
| 3.00X179.5 | 1795-30 | 3 | 179.5 | 0.118 | 7.067 |
| 3.00X184.5 | 1845-30 | 3 | 184.5 | 0.118 | 7.264 |
| 3.00X189.5 | 1895-30 | 3 | 189.5 | 0.118 | 7.461 |
| 3.00X194.5 | 1945-30 | 3 | 194.5 | 0.118 | 7.657 |
| 3.00X199.5 | 1995-30 | 3 | 199.5 | 0.118 | 7.854 |
| 3.00X209.5 | 2095-30 | 3 | 209.5 | 0.118 | 8.248 |
| 3.00X219.5 | 2195-30 | 3 | 219.5 | 0.118 | 8.642 |
| 3.00X229.5 | 2295-30 | 3 | 229.5 | 0.118 | 9.035 |
| 3.00X239.5 | 2395-30 | 3 | 239.5 | 0.118 | 9.429 |
| 3.00X244.5 | 2445-30 | 3 | 244.5 | 0.118 | 9.626 |
| 3.00X249.5 | 2495-30 | 3 | 249.5 | 0.118 | 9.823 |
| 5.70X044.3 | 0443-57 | 5.7 | 44.3 | 0.224 | 1.744 |
| 5.70X045.3 | 0453-57 | 5.7 | 45.3 | 0.224 | 1.783 |
| 5.70X049.3 | 0493-57 | 5.7 | 49.3 | 0.224 | 1.941 |
| 5.70X052.3 | 0523-57 | 5.7 | 52.3 | 0.224 | 2.059 |
| 5.70X054.3 | 0543-57 | 5.7 | 54.3 | 0.224 | 2.138 |
| 5.70X055.3 | 0553-57 | 5.7 | 55.3 | 0.224 | 2.177 |
| 5.70X059.3 | 0593-57 | 5.7 | 59.3 | 0.224 | 2.335 |
| 5.70X062.3 | 0623-57 | 5.7 | 62.3 | 0.224 | 2.453 |
| 5.70X064.3 | 0643-57 | 5.7 | 64.3 | 0.224 | 2.531 |
| 5.70X069.3 | 0693-57 | 5.7 | 69.3 | 0.224 | 2.728 |
| 5.70X074.3 | 0743-57 | 5.7 | 74.3 | 0.224 | 2.925 |
| 5.70X079.3 | 0793-57 | 5.7 | 79.3 | 0.224 | 3.122 |
| 5.70X084.3 | 0843-57 | 5.7 | 84.3 | 0.224 | 3.319 |
| 5.70X089.3 | 0893-57 | 5.7 | 89.3 | 0.224 | 3.516 |
| 5.70X094.3 | 0943-57 | 5.7 | 94.3 | 0.224 | 3.713 |
| 5.70X099.3 | 0993-57 | 5.7 | 99.3 | 0.224 | 3.909 |
| 5.70X104.3 | 1043-57 | 5.7 | 104.3 | 0.224 | 4.106 |
| 5.70X109.3 | 1093-57 | 5.7 | 109.3 | 0.224 | 4.303 |
| 5.70X114.3 | 1143-57 | 5.7 | 114.3 | 0.224 | 4.5 |
| 5.70X119.3 | 1193-57 | 5.7 | 119.3 | 0.224 | 4.697 |
| 5.70X124.3 | 1243-57 | 5.7 | 124.3 | 0.224 | 4.894 |
| 5.70X129.3 | 1293-57 | 5.7 | 129.3 | 0.224 | 5.091 |
| 5.70X134.3 | 1343-57 | 5.7 | 134.3 | 0.224 | 5.287 |
| 5.70X139.3 | 1393-57 | 5.7 | 139.3 | 0.224 | 5.484 |
| 5.70X144.3 | 1443-57 | 5.7 | 144.3 | 0.224 | 5.681 |
| 5.70X149.3 | 1493-57 | 5.7 | 149.3 | 0.224 | 5.878 |
| 5.70X154.3 | 1543-57 | 5.7 | 154.3 | 0.224 | 6.075 |
| 5.70X159.3 | 1593-57 | 5.7 | 159.3 | 0.224 | 6.272 |
| 5.70X164.3 | 1643-57 | 5.7 | 164.3 | 0.224 | 6.469 |
| 5.70X169.3 | 1693-57 | 5.7 | 169.3 | 0.224 | 6.665 |
| 5.70X174.3 | 1743-57 | 5.7 | 174.3 | 0.224 | 6.862 |
| 5.70X179.3 | 1793-57 | 5.7 | 179.3 | 0.224 | 7.059 |
| 5.70X184.3 | 1843-57 | 5.7 | 184.3 | 0.224 | 7.256 |
| 5.70X189.3 | 1893-57 | 5.7 | 189.3 | 0.224 | 7.453 |
| 5.70X194.3 | 1943-57 | 5.7 | 194.3 | 0.224 | 7.65 |
| 5.70X199.3 | 1993-57 | 5.7 | 199.3 | 0.224 | 7.846 |
| 5.70X209.3 | 2093-57 | 5.7 | 209.3 | 0.224 | 8.24 |
| 5.70X219.3 | 2193-57 | 5.7 | 219.3 | 0.224 | 8.634 |
| 5.70X229.3 | 2293-57 | 5.7 | 229.3 | 0.224 | 9.028 |
| 5.70X239.3 | 2393-57 | 5.7 | 239.3 | 0.224 | 9.421 |
| 5.70X249.3 | 2493-57 | 5.7 | 249.3 | 0.224 | 9.815 |
| 5.70X259.3 | 2593-57 | 5.7 | 259.3 | 0.224 | 10.209 |
| 5.70X269.3 | 2693-57 | 5.7 | 269.3 | 0.224 | 10.602 |
| 5.70X279.3 | 2793-57 | 5.7 | 279.3 | 0.224 | 10.996 |
| 5.70X289.3 | 2893-57 | 5.7 | 289.3 | 0.224 | 11.39 |
| 5.70X299.3 | 2993-57 | 5.7 | 299.3 | 0.224 | 11.783 |
| 5.70X309.3 | 3093-57 | 5.7 | 309.3 | 0.224 | 12.177 |
| 5.70X319.3 | 3193-57 | 5.7 | 319.3 | 0.224 | 12.571 |
| 5.70X339.3 | 3393-57 | 5.7 | 339.3 | 0.224 | 13.358 |
| 5.70X359.3 | 3593-57 | 5.7 | 359.3 | 0.224 | 14.146 |
| 5.70X379.3 | 3793-57 | 5.7 | 379.3 | 0.224 | 14.933 |
| 5.70X389.3 | 3893-57 | 5.7 | 389.3 | 0.224 | 15.327 |
| 5.70X399.3 | 3993-57 | 5.7 | 399.3 | 0.224 | 15.72 |
| 5.70X419.3 | 4193-57 | 5.7 | 419.3 | 0.224 | 16.508 |
| 5.70X439.3 | 4393-57 | 5.7 | 439.3 | 0.224 | 17.295 |
| 5.70X459.3 | 4593-57 | 5.7 | 459.3 | 0.224 | 18.083 |
| 5.70X479.3 | 4793-57 | 5.7 | 479.3 | 0.224 | 18.87 |
| 5.70X489.3 | 4893-57 | 5.7 | 489.3 | 0.224 | 19.264 |
| 5.70X499.3 | 4993-57 | 5.7 | 499.3 | 0.224 | 19.657 |
| 8.40X144.1 | 1441-84 | 8.4 | 144.1 | 0.331 | 5.673 |
| 8.40X149.1 | 1491-84 | 8.4 | 149.1 | 0.331 | 5.87 |
| 8.40X154.1 | 1541-84 | 8.4 | 154.1 | 0.331 | 6.067 |
| 8.40X159.1 | 1591-84 | 8.4 | 159.1 | 0.331 | 6.264 |
| 8.40X164.1 | 1641-84 | 8.4 | 164.1 | 0.331 | 6.461 |
| 8.40X169.1 | 1691-84 | 8.4 | 169.1 | 0.331 | 6.657 |
| 8.40X174.1 | 1741-84 | 8.4 | 174.1 | 0.331 | 6.854 |
| 8.40X179.1 | 1791-84 | 8.4 | 179.1 | 0.331 | 7.051 |
| 8.40X184.1 | 1841-84 | 8.4 | 184.1 | 0.331 | 7.248 |
| 8.40X189.1 | 1891-84 | 8.4 | 189.1 | 0.331 | 7.445 |
| 8.40X194.1 | 1941-84 | 8.4 | 194.1 | 0.331 | 7.642 |
| 8.40X199.1 | 1991-84 | 8.4 | 199.1 | 0.331 | 7.839 |
| 8.40X204.1 | 2041-84 | 8.4 | 204.1 | 0.331 | 8.035 |
| 8.40X209.1 | 2091-84 | 8.4 | 209.1 | 0.331 | 8.232 |
| 8.40X219.1 | 2191-84 | 8.4 | 219.1 | 0.331 | 8.626 |
| 8.40X229.1 | 2291-84 | 8.4 | 229.1 | 0.331 | 9.02 |
| 8.40X234.1 | 2341-84 | 8.4 | 234.1 | 0.331 | 9.217 |
| 8.40X239.1 | 2391-84 | 8.4 | 239.1 | 0.331 | 9.413 |
| 8.40X249.1 | 2491-84 | 8.4 | 249.1 | 0.331 | 9.807 |
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