Editing Torx (section)

=== External (inverted) Torx ===
[[File:FemaleTorxSocket.JPG|thumb|upright=0.5|External Torx driver]]

An '''External Torx''' version exists, also known as '''Inverted Torx''', 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 a T40 Torx bit, while an E8 Torx socket will fit a T40 Torx bit<ref name="WihaChart" />).

{| class="wikitable mw-collapsible mw-collapsed" style="text-align:center;"
|+ Properties of various External Torx drives
|-
! rowspan="2" scope="col" style="valign:bottom;" | Size
! colspan="2" scope="col" | Point-to-point distance<ref name="WihaChart" />
! colspan="2" scope="col" | Standard fastener selection<ref name="Textron" />
|-
! scope="col" | (in)
! scope="col" | (mm)
! scope="col" | SAE
! scope="col" | Metric
|-
| E4
| {{convert|3.8|mm|in|disp=tablecen|order=flip}}
| #6
| M3
|-
| E5
| {{convert|4.7|mm|in|disp=tablecen|order=flip}}
| #8
| M4
|-
| E6
| {{convert|5.6|mm|in|disp=tablecen|order=flip}}
| #10
| M5
|-
| E7
| {{convert|6.1|mm|in|disp=tablecen|order=flip}}
|
|
|-
| E8
| {{convert|7.4|mm|in|disp=tablecen|order=flip}}
| 1/4"
| M6 & M7
|-
| E10
| {{convert|9.3|mm|in|disp=tablecen|order=flip}}
| 5/16"
| M8
|-
| E12
| {{convert|11.1|mm|in|disp=tablecen|order=flip}}
| 3/8"
| M10 & M11
|-
| E14
| {{convert|12.8|mm|in|disp=tablecen|order=flip}}
| 7/16"
| M12
|-
| E16
| {{convert|14.7|mm|in|disp=tablecen|order=flip}}
| 1/2"
|
|-
| E18
| {{convert|16.6|mm|in|disp=tablecen|order=flip}}
| 9/16"
| M14
|-
| E20
| {{convert|18.4|mm|in|disp=tablecen|order=flip}}
| 5/8"
| M16
|-
| E24
| {{convert|22.1|mm|in|disp=tablecen|order=flip}}
| 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
|}