Editing Torx (section)

==Variants==
Although the brand "Torx" generally refers to the standard 6-star-driver or -socket, there are many variations to the original design, including a number made or licensed by Torx. Other tool manufacturers have been producing 8-, 10- and 12-point star drivers and sockets for many decades. The Torx brand is often used universally to describe these and other star driver variations.

=== Security Torx ===
[[File:Torx driver secure.png|thumb|upright=0.5|Security Torx driver]]

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 from being inserted. However, the pin allows a smaller flat head screw driver to be used successfully between two adjacent lobes.

Security Torx has its own set of variations, and many other variations of Torx drives are available in Security or TR versions. These include five- and seven-lobed TR heads.<ref>{{Cite web |title=7 Lobe Pin Button Security Screws |url=https://www.fastenright.com/security-fasteners/7-lobe-pin-button-security-screws/tx22 |access-date=2022-04-17 |website=Fastenright Ltd }}</ref>

=== Torx Paralobe ===
[[File:Screw Head - Torx Paralobe.svg|thumb|upright=0.5|Torx Paralobe head pattern]]

'''Torx Paralobe''' is a further developed Torx Drive System with 6% longer flanks which results in a 20% higher applicable torque.<ref>{{Cite web|url=https://www.acument.com/licensing/licensed-products/torx-paralobe-drive-system/|title=TORX PARALOBE Drive System {{!}} Acument Global Technologies|last=Media|first=Miller|access-date=2019-07-11|archive-date=2019-03-30|archive-url=https://web.archive.org/web/20190330121917/https://www.acument.com/licensing/licensed-products/torx-paralobe-drive-system/|url-status=dead}}</ref>

=== Torx Plus ===
[[File:Screw Head - Torx Plus.svg|thumb|upright=0.5|Torx Plus head pattern]]

A Torx successor, '''Torx Plus''', was introduced around 1990 when the original Torx patent was expiring. The Torx Plus patent subsequently expired in 2011.<ref>{{Cite patent |number=US5207132A |title=Elliptical lobed drive system |gdate=1993-05-04 |invent1=Goss |invent2=Seidl |inventor1-first=David |inventor2-first=Richard |url=https://patents.google.com/patent/US5207132A/en/ }}</ref><ref>{{Cite patent |number=CN1048080C |title=有椭圆凸出部的传动装置 |gdate=2000-01-05 |invent1=D·戈斯 |invent2=R·赛德尔 |url=https://patents.google.com/patent/CN1048080C/en/ }}</ref> The lobes are more square to allow for higher torque and to minimize wear. The name is shortened to '''IP''' (Internal Plus) with sizes ranging from 1IP to 100IP <ref name="TORX_PLUS">{{cite web|title=TORX PLUS Drive System|url=http://www.acument.com/pdfs/Catalog_TORX_PLUS_DS.pdf|publisher=Acument|access-date=2013-12-13|archive-date=2020-08-09|archive-url=https://web.archive.org/web/20200809132603/http://www.acument.com/pdfs/Catalog_TORX_PLUS_DS.pdf|url-status=dead}}</ref> (sometimes listed as IP1 to IP100 <ref>{{cite web |url=http://www.wihatools.com/300seri/366_IP_serie.htm |title=TORX PLUS Long arm L-Keys |publisher=Wiha Tools USA |access-date=14 July 2016 |archive-url=https://web.archive.org/web/20151007065658/http://www.wihatools.com/300seri/366_IP_serie.htm |archive-date=7 October 2015 }}</ref>) and '''EP''' (External Plus) with sizes ranging from 1EP to 42EP as well as smaller sizes ranging from H7EP to H2EP and includes five-lobed tamper-resistant variants.<ref name="TORX_PLUS" /> The specifications for these licenses are held by Textron. Standard Torx drivers can be used to drive Torx Plus screws, but not to full torque because of the loose fit. Torx Plus drivers will not fit into standard Torx screws.
* A tamper-resistant version of Torx Plus exists having '''five''' lobes rather than six, plus a solid post in the center, and is used for security as the drivers are uncommon.<ref>{{cite web|url=http://www.instructables.com/id/When-a-Phillips-is-not-a-Phillips-Plus-So-Much-Mor/step70/Torx-Plusreg-Security/|title=When a Phillips is not a Phillips Plus So Much More!|date=16 March 2010|work=[[Instructables]]|first=Egon |last=Pavlis }}</ref> Though Acument (formerly Textron) lists no designation,<ref>{{cite web |title=Fastening Solutions |url=http://www.acument.com/pdfs/Catalog_Fastening_Solutions.pdf |publisher=Acument }}</ref><ref>{{cite web |title=Tamper-Resistant TORX PLUS Drive System |url=http://www.textronfasteningsystems.com/PDFs/TP_tech/Tampresisttorxplus.pdf |publisher=Textron Fastening Systems |archive-url=https://web.archive.org/web/20061110014752/http://www.textronfasteningsystems.com/PDFs/TP_tech/Tampresisttorxplus.pdf |archive-date=2006-11-10 }}</ref> '''TS'''<ref>{{cite web |url=http://www.lasertools.co.uk/item.aspx?cat=1246&item=748 |title=TS Star Bits (5 Sided) 1/4"D 7pc - Part No. 3389 - Part of the TS Star/Torx* Plus range from Laser Tools |access-date=14 July 2016 }}</ref> or '''IPR'''<ref>{{cite web|url=http://www.wihatools.com/700seri/716_IPR_serie.htm |archive-url=https://web.archive.org/web/20151213093852/http://www.wihatools.com/700seri/716_IPR_serie.htm |archive-date=13 December 2015 |title=Security TORX PLUS Insert Bits |publisher=Wiha Tools USA |access-date=14 July 2016 }}</ref> may be seen. The screw may alternatively be a [[Pentalobe]].
* '''Torx Plus Maxx Stems''' is a highly specialized variant used on the ends of fasteners opposite the bolt-head, and provides higher torque than other drive systems allow.<ref>{{Cite web |url=https://www.acument.com/licensing/licensed-products/torx-plus-maxx-drive-system/ |title=TORX PLUS MAXX Drive System |access-date=2018-01-17 |archive-date=2020-08-09 |archive-url=https://web.archive.org/web/20200809160651/https://www.acument.com/licensing/licensed-products/torx-plus-maxx-drive-system/ |url-status=dead }}</ref> Torxstem is a stud with the Torx Plus Maxx drive on both ends.

=== Torx ttap ===
[[File:Screw_Head_-_TTAP.svg|thumb|upright=0.5|Torx Ttap head pattern]]

A proprietary version of Torx called '''Torx ttap''' was developed in 2006 and is licensed by Acument Intellectual Properties.<ref>{{Cite web |title=TORX ttap Advantages and benefits |url=https://www.ttapdrive.com/Product |access-date=2022-04-17 |website=Ttapdrive.com |archive-date=2019-09-23 |archive-url=https://web.archive.org/web/20190923125925/https://www.ttapdrive.com/Product |url-status=dead }}</ref> It features a second recess to create a [[Interference fit|"stick-fit"]] engagement (branded Frixion Fit), designed to minimize wobbling (branded Stable Drive) without pressing and the need for magnetic bits, a feature that can be important to certain industrial users.<ref>{{cite web |title=TTAP Fastener |url=https://www.acument.com/licensing/licensed-products/ttap/ |publisher=Acument Global Technologies |access-date=26 February 2017 |archive-date=27 February 2017 |archive-url=https://web.archive.org/web/20170227064510/https://www.acument.com/licensing/licensed-products/ttap/ |url-status=dead }}</ref> Standard Torx drivers can be used to drive Torx ttap screws, but Torx ttap drivers will not fit standard Torx screws.<ref>{{cite web |url=https://www.ttapdrive.com/Product |title=Torx ttap Advantages |website=Ttapdrive.com |publisher=Ttapdrive AS |access-date=26 February 2017 |archive-date=23 September 2019 |archive-url=https://web.archive.org/web/20190923125925/https://www.ttapdrive.com/Product |url-status=dead }}</ref>

=== AudiTorx ===
'''AudiTorx''' is a tamper-proof fastener where a convex and smooth fastener head is topped with a break-away Torx drive that snaps off when the engineered torque is reached, leaving a rivet-like bolt head that cannot be easily removed. The main application for these fasteners is in the railroad industry.<ref>{{Cite web |url=https://fontanagruppoagtna.com/auditorx/ |title=Acument Global Technologies |website=Fontana Group |access-date=2023-10-03 }}</ref>

=== 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
|}