Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, AF, Torx, Metric, SAE
7/8 ", 9/16 ", 3/16 ", 5/8 ", 11/16 "
1, 1-1/2, 2-1/2, 1/2, 3/8
9.53, 38.1, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Oxide, Black Phosphate