Internal Hex, External Hex, Internal Torx, Hex, TX
Torx, Metric, AF, Imperial, SAE
9/32 ", 4.5 mm, 7/16 ", 5/16 ", 1-1/2 "
1/4, 1, 1-1/2, 2-1/2, 1/2
25.4, 6.35, 38.1, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide