Editing Torx

{{Short description|Screw drive with 6-lobed star-shaped flower-petal pattern}}
{{Redirect|Star key|the key on a telephone keypad|asterisk#Telephony}}
{{More citations needed|date=March 2013}}
[[File:18-04-13-Schrauben-Schlüssel RRK3428.jpg|thumb|A security Torx L-key and fastener with holes for a safety pin to hinder disassembly with an ordinary Torx key.]]
[[File:Torx screw.JPG|thumb|A Torx T8 screw head on a [[hard disk drive]].]]

'''Torx''' (pronounced {{IPAc-en|t|ɔr|k|s}}) is a trademark for a type of [[screw drive]] characterized by a 6-point star-shaped pattern, developed in 1967<ref name="patent667">{{US patent|3584667}}, Bernard F. Reiland, "Coupling arrangement and tools for same", filed 1967-03-21</ref> by Camcar [[Textron]].{{Efn|Camcar eventually became part of [[Textron]] Fastening Systems in the 1990s. In 2006 Textron Fastening Systems was sold to Platinum Equities, LLC, of Beverly Hills, California. They renamed the company [http://www.acument.com/ Acument Global Technologies], which as of 2010 includes Avdel, Camcar, Ring Screw, and others. In 2014, [http://www.platinumequity.com/news/907/platinum-equity-sells-acument-to-fontana-gruppo Acument was sold] from Platinum Equity to Fontana Gruppo.}} A popular generic name for the drive is ''star'', as in '''star screwdriver''' or '''star bits'''. The official generic name, standardized by the [[International Organization for Standardization]] as '''ISO 10664''', is '''hexalobular internal'''.<ref>{{cite web |title=ISO 10664:2005 |url=http://www.iso.org/iso/catalogue_detail.htm?csnumber=40257 |publisher=ISO.org |access-date=2012-01-14 }}</ref> This is sometimes abbreviated in databases and catalogs as '''6lobe''' (starting with the numeral ''6'', not the capital letter ''G''). '''Torx Plus,''' '''Torx Paralobe''' and '''Torx ttap''' are improved head profiles.<ref>{{Cite web |date=2020-08-12 |title=What Is a Torx Screw? |url=https://fastenerengineering.com/what-is-a-torx-screw/ |access-date=2021-10-04 |website=Fastener Engineering }}</ref>

Torx screws are commonly found on [[automobile]]s, [[motorcycle]]s, [[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 [[screwdriver]]s were not widely available. However, as torx drivers became more common, tamper-resistant [[Torx#Competitive variants|variants]], as described below, were developed.<ref>{{cite journal |first=Paul |last=Sharke |title=Fast and Secure: how much proof is tamperproof? |journal=Mechanical Engineering |date=June 2005 |volume=127 |issue=6 |page=32 |doi=10.1115/1.2005-JUN-2 |url=http://www.memagazine.org/backissues/membersonly/june05/features/fastand/fastand.html |access-date=2012-01-14 |issn=0025-6501 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20070209152751/http://www.memagazine.org/backissues/membersonly/june05/features/fastand/fastand.html |archive-date=2007-02-09 |doi-access=free |url-access=subscription }}</ref> Torx screws are also becoming increasingly popular in construction industries.

==Principles of operation==
[[File:Torx-hex-contact-angles-forces.svg|thumb|upright|The angle between the plane of contact between tool and fastener and the circumferentially directed force is much closer to 90° in a Torx type of head (lower) than in a conventional [[Hex key|hex]] head (upper). (Exaggerated for illustrational purposes)]]

By design, Torx head screws resist [[cam out]] better than [[Phillips head]] or [[slot head]] screws.<ref name="patent667" /> Whereas the tendency of Phillips drivers to cam out under excessive torque has been listed as a feature preventing damage to the screw-head or driver,<ref>{{cite patent |country=US |number=2474994 }}</ref> Torx heads were designed to ''prevent'' cam-out. The development of better [[Torque limiter|torque-limiting]] automatic screwdrivers for use in factories allowed this change. Rather than rely on the tool to slip out of the screw head when a desired torque level is reached (which risks damage to the driver tip, screw head, or workpiece), torque-limiting driver designs achieve a desired torque consistently.

The Torx design allows for a higher torque to be exerted than a similarly sized conventional hex socket head without damaging the head or the tool.<ref name="patent667" /> The diagram depicts the interaction between the male and female components of a conventional hex drive and a Torx drive. The clearance between the components is exaggerated for clarity.

The green circle, passing through the six points of contact between the two components, represents the direction of the rotational force being exerted at each of those points. Because the plane of contact is not perpendicular to this circle, a radial force is also generated which tends to "burst" the female component and "crush" the male one. If this radial force component is too great for the material to withstand, it will cause the corners to be rounded off one or both components or will split the sides of the female part. The magnitude of this force is proportional to the [[cotangent]] of the angle (depicted in orange) between the green circle and the contact plane.

For the Torx type of design, the angle is much closer to 90° than in the case of the hex head, and so for a given torque the potentially damaging radial force is much lower. This property allows the head of the fastener to be smaller for the same required torque, which can be an advantage in applications where space to accommodate the head is limited.

==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
|}

==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
|}

== Competitive variants ==
'''AW drive''' is a hexalobular-type screw head similar to Torx, with a tapered profile to aid in centering, developed by the [[Würth]] Group in Germany.<ref>{{cite web |title=Technical Information on Fasteners: Design recommendations 11.1 Inside drives for screws – AW drive (AW-Antrieb) |url=http://wueko.wuerth.com/medien/produktinfo0000-EN/pdfNEW/09199.pdf |publisher=Adolf Würth GmbH & Co. KG |access-date=2 March 2017 |archive-date=1 March 2017 |archive-url=https://web.archive.org/web/20170301213648/http://wueko.wuerth.com/medien/produktinfo0000-EN/pdfNEW/09199.pdf |url-status=dead }}</ref> It is available in five sizes: AW&nbsp;10, AW&nbsp;20, AW&nbsp;25, AW&nbsp;30 and AW&nbsp;40.<ref>{{cite web |title=Construction Range Overview (Fasteners: Introducing the AW Drive System, p. 3) |url=http://wurth.co.nz/construction-snapshot/files/assets/common/downloads/page0005.pdf |publisher=Würth New Zealand |date=2016 }}</ref>

'''T-Star plus''' has a similar screw drive design to Torx ttap and was introduced in 2005 by German fastener manufacturer [[Altenloh, Brinck & Co]] under its brand name ''Spax''.<ref>{{cite web |title=Multi-Material Construction Screws |url=https://spax.us/multi-purpose-construction-screws |publisher=Spax US |access-date=16 June 2024 |archive-url=https://web.archive.org/web/20240616145411/https://spax.us/multi-purpose-construction-screws |archive-date=16 June 2024}}</ref>

== Gallery ==
<gallery widths="200px" heights="150px">
File:Torx-Bits_T15-T20-T25-T30.jpg|Torx bits T15, T20, T25, and T30
File:Torx 01 KMJ.jpg|A Torx wrench
File:Torx.jpg|Closeup of Torx screwdriver tip
File:18-03-22-Schrauben-M6x20 RRK3361.jpg|A Torx T30 bolt
</gallery>

== See also ==
* [[Wrench]]

== Explanatory notes ==
{{Notelist}}

== References ==
{{Reflist}}

== External links ==
* {{Commons category-inline}}

[[Category:Screws]]