Security star bit is a version known as Security Torx, Tamper-Resistant Torx (often shortened to Torx TR) or pin-in Torx contains a post in the center of the head that prevents a standard Torx driver (or a straight screwdriver) from being inserted.
An External Torx 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). 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. Ever Hardware provides custom-made fasteners and customizable packaging.

Properties of various Torx drives
Size  Point-to-point distance  Maximum torque range ~ E Torx
(in) (mm) (lb•ft) (N•m)
T1 0.031 0.81 0.01–0.02 0.02–0.03
T2 0.036 0.93 0.05–0.07 0.07–0.09
T3 0.046 1.1 0.10–0.13 0.14–0.18
T4 0.05 1.28 0.16–0.21 0.22–0.28
T5 0.055 1.42 0.32–0.38 0.43–0.51 E2
T5.5
T6 0.066 1.7 0.55–0.66 0.75–0.90
T7 0.078 1.99 1.0–1.3 1.4–1.7
T8 0.09 2.31 1.6–1.9 2.2–2.6
T9 0.098 2.5 2.1–2.5 2.8–3.4
T10 0.107 2.74 2.7–3.3 3.7–4.5
T15 0.128 3.27 4.7–5.7 6.4–7.7
T20 0.151 3.86 7.74–9.37 10.5–12.7 E4
T25 0.173 4.43 11.7–14.0 15.9–19 E5
T27 0.195 4.99 16.6–19.8 22.5–26.9
T30 0.216 5.52 22.9–27.6 31.1–37.4 E6
T35
T40 0.26 6.65 39.9–48.0 54.1–65.1 E8
T45 0.306 7.82 63.4–76.1 86–103.2
T47 GM-Style
T50 0.346 8.83 97.4–117 132–158 E10
T55 0.44 11.22 161–189 218–256 E12
T60 0.519 13.25 280–328 379–445 E16
T70 0.61 15.51 465–516 630–700 E18
T80 0.69 17.54 696–773 943–1048 E20
T90 0.784 19.92 984–1094 1334–1483
T100 0.871 22.13 1359–1511 1843–2048 E24
Category Security Star Bit
Finish Electro-Plating
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″
Security star bit precision torx security machine screws cap head

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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.
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