Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, Torx, AF, Metric, SAE
5.5 mm, 11/16 ", 10 mm, 12 mm, 5/16 "
1-1/2, 1, 3/8, 2-1/2, 3/4
6.35, 19.05, 12.5, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide