External Hex, Internal Torx, Internal Hex, TX, Hex
Torx, AF, Imperial, Metric, SAE
5.5 mm, 9 mm, 11/16 ", 28 mm, 1-1/2 "
3/4, 2-1/2, 1-1/2, 3/8, 1/2
9.53, 38.1, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Phosphate, Black Oxide