| BS450 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS450-1958TAB2-2 3-16BSWX1 1-2 - | K0195 | BRITISH STANDARDS INSTITUTION |
| NEN1780A-BSW3/16X1,1/2-4.6-A2P | H1266 | STICHTING NEDERLANDSNORMALISATIE-INSTITUUT |
| BS450-1958TAB2-2-3-16BSWX1-1-2-- | K0195 | BRITISH STANDARDS INSTITUTION |