Internal Hex, External Hex, Internal Torx, TX, Hex
AF, Imperial, Torx, SAE, Metric
9/16 ", 3/16 ", 25 mm, 1-1/2 ", 11/16 "
1-1/2, 2-1/2, 1/2, 3/4, 3/8
25.4, 19.05, 9.53, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide