| BS4168 PART 1 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS4168 PART 1-M6X55-12.9 CD | K7766 | BRITISH STANDARDS INSTITUTION |
| ISO4762-M6X55-12.9 | I9008 | INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) |
| M6X55-12.9 CADMIUM PLATED | K7766 | BRITISH STANDARDS INSTITUTION |
| BSENISO4762 | K7766 | BRITISH STANDARDS INSTITUTION |