Internal Torx, Internal Hex, External Hex, Hex, TX
Torx, AF, Imperial, SAE, Metric
18 mm, 5/16 ", 9/16 ", 25 mm, 1-1/2 "
3/8, 1/4, 1-1/2, 2-1/2, 3/4
25.4, 6.35, 38.1, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Phosphate, Black Oxide