Bsp58 vs Bs341 8: specs compared
Updated 05 September 2026.
5
specs differ
Bsp58 and Bs341 8 differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Bsp58 | Bs341 8 |
|---|---|---|
| Designation | 5/8" BSP (7/8"-14 nut) | W21.8 (British designation) |
| Size / thread | 5/8" BSP female, carried on a 7/8"-14 coupling nut | 21.8 mm x 14 TPI right hand, external (the W21.8 thread) |
| Fitting form | parallel beer thread | cylinder valve outlet nut, external |
| Seals on | flat nylon or fibre washer on the face of the thread | captive O-ring or washer in the nut against the valve outlet |
| Rating / role | the US and UK draft shank and Sanke coupler beer thread | the British Standard 341 designation for the CO2 cylinder outlet used across the UK |
Questions and answers
How do Bsp58 and Bs341 8 compare?
Bsp58 and Bs341 8 differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.