Siffar Bolt daidaitaccen girman zaɓi na zaɓi: GB/T5783, GB/T5782, SH/T3404, DIN933, DIN931, ISO4014, ISO4017, UNI5737/UNI5739 ma'aunin Italiyanci, ASME B18.2.3.1m, ASME B18.2.3.3.2m. .5m B18.2.3.6M metric outer hexagon, ANSI/ASME B18.2.1 da sauran ma'auni.