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Step 84Torx® Drive
Torx® was developed in 1965 by Camcar Technical center, located in Rockford, Illinois, of Acument Global Technologies (formerly Camcar Textron), is the trademark for a type of screw head characterized by a 6-point star-shaped recess. People unfamiliar with the trademark generally use the term star, as in star screwdriver or star bits. The generic name is hexalobular internal driving feature and is standardized by the International Organization for Standardization as ISO 10664.
Torx® screws are commonly found on automobiles, hard disk drives, computer systems (Compaq® uses almost exclusively T15 screws) and consumer electronics, but are also becoming increasingly popular in construction.
This style of head is now very common in trucks and automobiles. The walls of the recess are not tapered. Drivers greatly outlast similar hex head drivers.
Torx® head sizes are described using the capital letter "T", followed by a number. A smaller number corresponds to a smaller point-to-point dimension of the screw head. Common sizes include T10, T15 and T25, although they reach as high as T100. Only the proper driver can drive a specific head size without risk of ruining the driver or screw. The same series of Torx drivers is used to drive SAE, metric and other thread system fasteners, reducing the number of bit sizes required. Excellent sizing charts available on the Wiha Toolswebsite.
Fellow instructables contributor peter_broach adds: CNC machines often use rotary broaching tools to make forms like these in custom screws.
Torx® screws are commonly found on automobiles, hard disk drives, computer systems (Compaq® uses almost exclusively T15 screws) and consumer electronics, but are also becoming increasingly popular in construction.
This style of head is now very common in trucks and automobiles. The walls of the recess are not tapered. Drivers greatly outlast similar hex head drivers.
Torx® head sizes are described using the capital letter "T", followed by a number. A smaller number corresponds to a smaller point-to-point dimension of the screw head. Common sizes include T10, T15 and T25, although they reach as high as T100. Only the proper driver can drive a specific head size without risk of ruining the driver or screw. The same series of Torx drivers is used to drive SAE, metric and other thread system fasteners, reducing the number of bit sizes required. Excellent sizing charts available on the Wiha Toolswebsite.
Fellow instructables contributor peter_broach adds: CNC machines often use rotary broaching tools to make forms like these in custom screws.
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