Internal Hex, External Hex, TX, Hex, External Torx
Torx, AF, Imperial, Metric, SAE
5.5 mm, 13/16 ", 5/16 ", 33 mm, 11/16 "
1, 2-1/2, 1-1/2, 1/2, 3/8
38.1, 25.4, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Phosphated, Oxidised, Black Phosphate, Black Oxide