| 200-251-4490 | U1068 | TRELLEBORG SEALING SOLUTIONS (UK)LTD |
| 251 | K7766 | BRITISH STANDARDS INSTITUTION |
| ASCC 17/27-110 | 99237 | AIRFORCE-NAVY AERONAUTICAL DESIGN STANDARD |
| BS1806 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS1806-251 | K7766 | BRITISH STANDARDS INSTITUTION |
| BSM48-251 | K7766 | BRITISH STANDARDS INSTITUTION |