Bolt ọdịdị ọkọlọtọ nha nhọrọ nhọrọ: GB/T5783, GB/T5782, SH/T3404, DIN933, DIN931, ISO4014, ISO4017, UNI5737/UNI5739 Italian ọkọlọtọ, ASME B18.2.3.1m, ASME B18.2.3.18m.2, ASME B18.2.3.15m. .5m B18.2.3.6M metric mpụta hexagon, ANSI/ASME B18.2.1 na ndị ọzọ ọkọlọtọ akụkụ.