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

External Torx Head Screw Bolt Before Threading Flanged

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What Client’s Say

Those look great! All the specs look perfect.
Kent De Mond
Perfect ! This is that I need.
Hernán Balboa
Thank you very much.
The bolts are perfect and they’re fits good.
Ashley
The nut fits perfect on our M2.5 screw part.
Height is also ok.
Mirjam
I tested the bolts this morning and they are perfect. Thank you so much.
Bill McDonald

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