Flat head torx screw socket head black screw caps

Flat head torx screw are also known as torx caps screws. 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 flat head torx screw and customizable packaging. 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.

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

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Category Flat head torx screw
Finish Heat treating & Galvanization
Thread type Machine thread
Material Steel or Stainless steel/Aluminum/Titanium
Brand Ever Hardware
Place of origin China Mainland
Size option M1.0 to M30

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