Internal Torx, External Hex, TX, Hex, 6-Point
Imperial, Torx, Metric, AF, SAE
3/16 ", 14 mm, 1/4 ", 5/16 ", 9 mm
1, 1-1/2, 3/8, 2-1/2, 1/2
6.35, 19.05, 12.5, 25.4, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Phosphatized, Oxidised, Black Oxide, Black Phosphate