| 327 | K7766 | BRITISH STANDARDS INSTITUTION |
| 4A41-Y1-327 | U3341 | THOMPSON VALVES LTD |
| DEFSTAN02-337-327-HN70 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| NES 337 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| BS1806-327 | K7766 | BRITISH STANDARDS INSTITUTION |
| BSM48-327 | K7766 | BRITISH STANDARDS INSTITUTION |
| NES 337-1984 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| NES 337-327-HN70 | K2516 | MINISTRY OF DEFENCE NAVY SHIPS SUPPORT AGENCY |
| NES337-327-HN70-(N73H) | U6183 | PRECISION POLYMER ENGINEERING LIMITE |