External Torx, Internal Torx, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
13/16 ", 7/16 ", 5/8 ", 13 mm, 5/16 "
38.1, 19.05, 6.35, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Phosphate, Black Oxide