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Torx® Bits

TORX, developed by Camcar LLC of Acument Global Technologies (formerly Camcar Textron), is the trademark for a type of screw head characterized by a 6-point star-shaped pattern (in the same way that slotted heads, Phillips, hex socket, and Robertson have linear, cruciform, hexagonal, and square tips, respectively). 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 standardised by the International Organization for Standardization as ISO 10664. TORX is frequently styled Torx despite the official all-caps trademark styling.

By design, TORX head screws resist cam-out better than Phillips head or slot head (flathead) screws. Where Phillips heads were designed to cause the driver to cam out, to prevent over-tightening, TORX heads were designed to prevent it. The reason for this was the development of better torque-limiting automatic screwdrivers for use in factories. Rather than relying on the tool slipping out of the screw head when a torque level is reached, and thereby risking damage to the driver tip, screw head and workpiece, the drivers were designed to achieve a desired torque consistently. Camcar LLC claims this can increase tool bit life by ten times or more.

- Wikipedia

Here is their main Torx webpage.

This table presents the most common sizes.

 

Driver
Size
"A" Diameter
Across Points (in.)
  - RF Cafe
Diameter
Inside
Points
T-1 0.033 0.024
T-2 0.037 0.027
T-3 0.044 0.032
T-4 0.051 0.036
T-5 0.055 0.040
T-6 0.066 0.048
T-7 0.077 0.056
T-8 0.090 0.065
T-9 0.097 0.070
T-10 0.107 0.077
T-15 0.128 0.092
T-20 0.151 0.109
T-25 0.173 0.124
T-27 0.195 0.140
T-30 0.216 0.155
T-40 0.260 0.187
T-45 0.306 0.218
T-50 0.346 0.242
T-55 0.440 0.312
T-60 0.520 0.372
T-70 0.610 0.435
T-80 0.689 0.497
T-90 0.782 0.558
T-100 0.870 0.620
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Copyright: 1996 - 2018
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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