Torx bit and e-torx socket are very common in the automotive industry. These are the size charts for you to find the best-fit sockets for your fasteners.

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Torx bit sockets
Internal torx bolt can be found in
automotive industry and computer system.
Torx bit (or External Torx/Male Torx)
sockets are designed to fit and turn
fasteners with an internal Torx head.
The sizes of Torx bit sockets are described
using the letter T followed by a number,
ranging between T1(smallest) and
T100(largest).
Torx bit socket sizes chart
Sizes
Point to Point
(Inch)
Point to Point
(mm)
Maximum torque range
(lb·ft)
T1 .031 .81 0.015–0.022
T2 .036 .93 0.052–0.066
T3 .046 1.10 0.10–0.13
T4 .050 1.28 0.16–0.21
T5 .055 1.42 0.32–0.38
T6 .066 1.70 0.55–0.66
T7 .078 1.99 1.0–1.3
T8 .090 2.31 1.6–1.9
T9 .098 2.50 2.1–2.5
T10 .107 2.74 2.7–3.3
T15 .128 3.27 4.7–5.7
T20 .151 3.86 7.7–9.4
T25 .173 4.43 11.7–14.0

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Sizes
Point to Point
(Inch)
Point to Point
(mm)
Maximum torque range
(lb·ft)
T27 .195 4.99 16.6–19.8
T30 .216 5.52 22.9–27.6
T40 .260 6.65 39.9–48.0
T45 .306 7.82 63.4–76.1
T50 .346 8.83 97–117
T55 .440 11.22 161–189
T60 .519 13.25 280–328
T70 .610 15.51 460–520
T80 .690 17.54 696–773
T90 .784 19.92 984–1,094
T100 .871 22.13 1,359–1,511

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E-Torx socket
External torx bolt can be commonly found in
German cars
Also known as external torx socket/ female torx
socket. They are not actually bit socket because,
well, they do not have any bit. They are designed
to fit and turn fasteners with an external Torx
head.
The head size of E-torx sockets are designated
by the letter E followed by a number, ranging
between E4 (smallest) and E44 (largest)
E-torx socket sizes chart
Size
Point to Point
distance
(inch)
Point to Point
distance
(mm)
Standard fastener
selection (SAE)
Standard fastener
selection (Metric)
E4 0.15 3.8 #6 M3
E5 0.19 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 0.37 9.3 5/16" M8
E12 0.44 11.1 3/8" M10 & M11
E14 0.50 12.8 7/16" M12
E16 0.58 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

4. Gmundcars.com
Size
Point to Point
distance
(inch)
Point to Point
distance
(mm)
Standard fastener
selection (SAE)
Standard fastener
selection (Metric)
E36 1-1/8" M30
E40 1-1/4" M33
E44 1-3/8" M36
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socket-sets/