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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.)
  		Diameter
Inside
Points
T-10.0330.024
T-20.0370.027
T-30.0440.032
T-40.0510.036
T-50.0550.040
T-60.0660.048
T-70.0770.056
T-80.0900.065
T-90.0970.070
T-100.1070.077
T-150.1280.092
T-200.1510.109
T-250.1730.124
T-270.1950.140
T-300.2160.155
T-400.2600.187
T-450.3060.218
T-500.3460.242
T-550.4400.312
T-600.5200.372
T-700.6100.435
T-800.6890.497
T-900.7820.558
T-1000.8700.620

RF Cafe Software

RF Cascade Workbook
 RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

Smith Chart™ for Excel
Smith Chart™ for Visio
RF & EE Symbols Word
RF Stencils for Visio
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