External torx head is one of special head type for screw or bolt. External torx head is a variant of torx drive. Torx developed in 1967 by Camcar Textron, is the trademark for a type of screw head characterized by a 6-point star-shaped pattern. A popular generic name for the drive is star, as in star screwdriver or star bits. The official generic name, standardized by the International Organization for Standardization as ISO 10664, is hexalobular internal. This is sometimes abbreviated in databases and catalogs as 6lobe (starting with numeral “6”, not a capital “G”). Torx Plus is an improved head profile. Ever Hardware provides custom-made fasteners and customizable packaging.
Torx screws are commonly found on automobiles, motorcycles, bicycle brake systems (disc brakes), hard disk drives, computer systems and consumer electronics. Initially, they were sometimes used in applications requiring tamper resistance, since the drive systems and screwdrivers were not widely available; as drivers became more common, tamper-resistant variants, as described below, were developed. Torx screws are also becoming increasingly popular in construction industries.
An External Torx head version exists, where the screw head has the shape of a Torx screwdriver bit, and a Torx socket is used to drive it. The external “E” Torx nominal sizing does not correlate to the “T” size, (e.g. an E40 socket is too large to fit an E40, while E8 Torx socket will fit a T40 Torx bit ).
| Category | External Torx Head |
|---|---|
| Finish | Galvanization |
| Thread type | Metric/Imperial/According to Request |
| Material | Stainless Steel/Carbon Steel/Aluminum/Brass/Copper, etc. |
| Brand | Ever Hardware |
| Place of origin | China Mainland |
| Size option | M1.0 to M18/#0 to 1/2″ |
Properties of various External Torx drives
| Size | Point-to-point distance | Standard fastener selection | ||
|---|---|---|---|---|
| (in) | (mm) | (SAE) | (metric) | |
| E4 | 0.15 | 3.8 | #6 | M3 |
| E5 | 0.18 | 4.7 | #8 | M4 |
| E6 | 0.22 | 5.6 | #10 | M5 |
| E7 | 0.24 | 6.1 | ||
| E8 | 0.29 | 7.4 | 1/4″ | M6 & M7 |
| E10 | 0.36 | 9.3 | 5/16″ | M8 |
| E12 | 0.43 | 11.1 | 3/8″ | M10 & M11 |
| E14 | 0.50 | 12.8 | 7/16″ | M12 |
| E16 | 0.57 | 14.7 | 1/2″ | |
| E18 | 0.65 | 16.6 | 9/16″ | M14 |
| E20 | 0.72 | 18.4 | 5/8″ | M16 |
| E24 | 0.87 | 22.1 | 3/4″ | M18 & M20 |
| E28 | 7/8″ | M22 | ||
| E32 | 1″ | M24 & M27 | ||
| E36 | 1-1/8″ | M30 | ||
| E40 | 1-1/4″ | M33 | ||
| E44 | 1-3/8″ | M36 | ||
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