Editing Torx (section)

==Sizing==
{{Screws}}

Torx head sizes are described using the capital letter "T" followed by a number ranging from T1 to T100.<ref name="WihaChart">{{cite web|url=http://www.wihatools.com/Marketing/torxspec.htm |archive-url=https://web.archive.org/web/20151226084217/http://www.wihatools.com/Marketing/torxspec.htm |archive-date=2015-12-26 |title=Chart of Torx fasteners and tools |publisher=Wiha Tools USA |access-date=2012-01-14 }}</ref> Some manufacturers and resellers head sizes are also described using "TX" or "Tx" in front of the number.<ref>{{Cite web|url=https://lunatools.com/en/product-category/bits-en/torx-bits-en/|title=Torx bits}}</ref><ref>{{Cite web|url=https://www.contorion.at/|title=Contorion: digitaler Fachhändler für Handwerk und Industrie|first=Contorion|last=GmbH|website=Contorion.at}}</ref> A smaller number corresponds to a smaller point-to-point dimension of the screw head (diameter of circle circumscribed on the cross-section of the tip of the screw driver). Common sizes include T10, T15, and T25, while T35 and T47 tend to see specialized use. Only the proper driver can drive a specific head size without risk of damaging the driver or screw. The same series of Torx drivers is used to drive [[Society of Automotive Engineers|SAE]], [[Metric screw thread|metric]] and other thread system fasteners, reducing the number of bit sizes required.

The "external" variants of Torx head sizes (see below) are described using the capital letter "E" followed by a number ranging from E4 to E44.<ref name="Textron">{{cite web|title=TORX Drive System |url=http://www.textronfasteningsystems.com/PDFs/torx.pdf |publisher=Textron Fastening Systems |archive-url=https://web.archive.org/web/20070102194628/http://www.textronfasteningsystems.com/PDFs/torx.pdf |archive-date=2007-01-02 }}</ref> The "E" numbers are different from the "T" numbers of the same size: for example, an E4 Torx socket fits a T20 head.<ref name="WihaChart" />

{| class="wikitable" style="text-align:center;"
|+ Properties of various Torx drives<ref>{{cite ISO standard |csnumber=63207 |title=ISO 10664:2014 - Hexalobular internal driving feature for bolts and screws}}</ref><ref name="WihaChart" />
|- style="vertical-align:bottom;"
! rowspan="2" scope="col" | Size
! colspan="2" scope="col" | Point-to-point distance
! colspan="2" scope="col" | Maximum torque range
! rowspan="2" scope="col" | ~ E Torx
|-
! scope="col" | (in)
! scope="col" | (mm)
! scope="col" | (lb·ft)
! scope="col" | (N·m)
|-
| T1
| {{convert|0.90|mm|in|disp=tablecen|order=flip}}
| {{convert|0.02|-|0.03|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T2
| {{convert|1.00|mm|in|disp=tablecen|order=flip}}
| {{convert|0.07|-|0.09|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T3
| {{convert|1.20|mm|in|disp=tablecen|order=flip}}
| {{convert|0.14|-|0.18|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T4
| {{convert|1.35|mm|in|disp=tablecen|order=flip}}
| {{convert|0.22|-|0.28|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T5
| {{convert|1.50|mm|in|disp=tablecen|order=flip}}
| {{convert|0.43|-|0.51|Nm|lb.ft|disp=tablecen|order=flip}}
| E2
|-
| T6
| {{convert|1.75|mm|in|disp=tablecen|order=flip}}
| {{convert|0.75|-|0.90|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T7
| {{convert|2.10|mm|in|disp=tablecen|order=flip}}
| {{convert|1.4|-|1.7|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T8
| {{convert|2.40|mm|in|disp=tablecen|order=flip}}
| {{convert|2.2|-|2.6|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T9
| {{convert|2.60|mm|in|disp=tablecen|order=flip}}
| {{convert|2.8|-|3.4|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T10
| {{convert|2.80|mm|in|disp=tablecen|order=flip}}
| {{convert|3.7|-|4.5|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T15
| {{convert|3.35|mm|in|disp=tablecen|order=flip}}
| {{convert|6.4|-|7.7|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T20
| {{convert|3.95|mm|in|disp=tablecen|order=flip}}
| {{convert|10.5|-|12.7|Nm|lb.ft|disp=tablecen|order=flip}}
| E4
|-
| T25
| {{convert|4.50|mm|in|disp=tablecen|order=flip}}
| {{convert|15.9|-|19|Nm|lb.ft|disp=tablecen|order=flip}}
| E5
|-
| T27
| {{convert|5.10|mm|in|disp=tablecen|order=flip}}
| {{convert|22.5|-|26.9|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T30
| {{convert|5.60|mm|in|disp=tablecen|order=flip}}
| {{convert|31.1|-|37.4|Nm|lb.ft|disp=tablecen|order=flip}}
| E6
|-
| T35<ref>{{cite web|url=http://www.sourcingmap.com/pcs-t35-313-torx-head-screwdriver-link-12-square-mechanic-drive-socket-p-268675.html|title=2 Pcs T35 3/13 Torx Head Screwdriver Link 1/2 Square Mechanic Drive Socket|access-date=2013-12-13|archive-date=2020-11-25|archive-url=https://web.archive.org/web/20201125021753/http://www.sourcingmap.com/pcs-t35-313-torx-head-screwdriver-link-12-square-mechanic-drive-socket-p-268675.html|url-status=dead}}</ref>
| {{convert|5.90|mm|in|disp=tablecen|order=flip}}
| 
| 
| E7
|-
| T40
| {{convert|6.75|mm|in|disp=tablecen|order=flip}}
| {{convert|54.1|-|65.1|Nm|lb.ft|disp=tablecen|order=flip}}
| E8
|-
| T45
| {{convert|7.93|mm|in|disp=tablecen|order=flip}}
| {{convert|86|-|103.2|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T47<ref>{{cite web|url=http://buy1.snapon.com/catalog/item.asp?item_ID=636916&group_ID=674869|title=FTX47E, Socket Driver, TORX, GM-style, T47|access-date=2013-12-13|archive-date=2013-12-16|archive-url=https://web.archive.org/web/20131216052637/http://buy1.snapon.com/catalog/item.asp?item_ID=636916&group_ID=674869|url-status=dead}}</ref><ref>{{cite web|url=http://www.rodneydickman.com/torxsockets.html|title=Fiero Torx Sockets|access-date=2013-12-13|archive-date=2017-12-12|archive-url=https://web.archive.org/web/20171212021306/http://www.rodneydickman.com/torxsockets.html|url-status=dead}}</ref>
| GM-Style
| 
| 
| 
| 
|-
| T50
| {{convert|8.95|mm|in|disp=tablecen|order=flip}}
| {{convert|132|-|158|Nm|lb.ft|disp=tablecen|order=flip}}
| E10
|-
| T55
| {{convert|11.35|mm|in|disp=tablecen|order=flip}}
| {{convert|218|-|256|Nm|lb.ft|disp=tablecen|order=flip}}
| E12
|-
| T60
| {{convert|13.45|mm|in|disp=tablecen|order=flip}}
| {{convert|379|-|445|Nm|lb.ft|disp=tablecen|order=flip}}
| E16
|-
| T70
| {{convert|15.70|mm|in|disp=tablecen|order=flip}}
| {{convert|630|-|700|Nm|lb.ft|disp=tablecen|order=flip}}
| E18
|-
| T80
| {{convert|17.75|mm|in|disp=tablecen|order=flip}}
| {{convert|943|-|1048|Nm|lb.ft|disp=tablecen|order=flip}}
| E20
|-
| T90
| {{convert|20.20|mm|in|disp=tablecen|order=flip}}
| {{convert|1334|-|1483|Nm|lb.ft|disp=tablecen|order=flip}}
| 
|-
| T100
| {{convert|22.40|mm|in|disp=tablecen|order=flip}}
| {{convert|1843|-|2048|Nm|lb.ft|disp=tablecen|order=flip}}
| E24
|}