Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, Metric, AF, Imperial, SAE
11/16 ", 5/16 ", 7/8 ", 9/16 ", 7/16 "
1/4, 3/8, 2-1/2, 1/2, 3/4
38.1, 19.05, 6.35, 9.53, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide