Ponahalo ea bolt boholo bo tloaelehileng ka boikhethelo: GB/T5783, GB/T5782, SH/T3404, DIN933, DIN931, ISO4014, ISO4017, UNI5737/UNI5739 standard ea Italy, ASME B18.2.3.1m, ASME B18.2.3.5m. .5m B18.2.3.6M metric hexagon e ka ntle, ANSI/ASME B18.2.1 le litekanyo tse ling tse tloaelehileng.