The dimensions of bolt products can be selected in accordance with: GB/T5783, GB/T5782, SH/T3404, DIN933, DIN931, ISO4014, ISO4017, UNI5737/UNI5739 Italian standards, ASME B18.2.3.1M, ASME B18.2.3.5M, ASME B18.2.3.6M metric hexagonal, ANSI/ASME B18.2.1 American standards, non-standard sizes, etc.