Application: Actuation of passenger car tire valves and valve application of car air conditioning hexagonal drive ISO 1173 C6.3 (1/4″) Drive: Hexagonal solid 6.3 (1/4 inch) special steel for highest demands highest dimensional accuracy of the tips and cutting edges for electric or compressed air driven machine screwdrivers (rotary screwdrivers) as well as for manual actuation tough for threaded screws (hard screw case) Permanent hardness of 59-61 HR C for high requirements in industry and trade high torque values, well over DIN standard, with long service life
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