Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, Metric, Torx, AF, SAE
9/32 ", 5.5 mm, 15 mm, 11/16 ", 1-1/2 "
3/4, 1-1/2, 2-1/2, 1/2, 3/8
38.1, 6.35, 9.53, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide