1. The bolt product dimensions can be selected to comply 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.

2. The standard sizes of nuts available are: GB/T6170, GB/T6172, GB/T6175, GB/T9125 (large hexagon), GB/T1229 (large hexagon for steel structure), GB/T923, HG/T20634 (special), HG/T20613 (special), SH/T3404, DIN934, ISO4032, ISO4035, UNI5587 heavy duty, UNI5588, ANSI (UNC/UNF/UN) American standard coarse/fine/8-tooth permanent, ANSI/ASME B18.2.2 American heavy duty, ASME B18.2.4.1M, ASME B18.2.4.2M, ASME B18.2.4.3M, ASME B18.2.4.6M metric hexagon nuts, non-standard, etc.

3. Surface treatment: blackening, phosphating.