Bolt ko'rinishi standart o'lchami ixtiyoriy: GB/T5783, GB/T5782, SH/T3404, DIN933, DIN931, ISO4014, ISO4017, UNI5737/UNI5739 Italiya standarti, ASME B18.2.3.1m, ASME B18.2.3.1m, ASME B18.2.AS3.B18.2.AS3. .5m B18.2.3.6M metrik tashqi olti burchakli, ANSI/ASME B18.2.1 va boshqa standart o'lchamlar.