6 қырлы жұлдыз тәрізді бұранда басы

Screw drive with 6 lobed star shaped flower petal pattern

Torx (pronounced /t//ɔr//k//s/) is a trademark for a type of screw drive characterized by a 6 point star shaped pattern, developed in 1967 by Camcar Textron. 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. 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. Torx screws are commonly found on automobiles, motorcycles, 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 screwdrivers were not widely available; as drivers became more common, tamper resistant variants, as described below, were developed. Torx screws are also becoming increasingly popular in construction industries.

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.

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.

Torx Paralobe is a further developed Torx Drive System with 6% longer flanks which results in a 20% higher applicable torque.

A Torx successor, Torx Plus, was introduced around 1990 when the original Torx patent was expiring. The Torx Plus patent subsequently expired in 2011. 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 (sometimes listed as IP1 to IP100 ) 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. Though Acument (formerly Textron) lists no designation, TS or IPR 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. Torxstem is a stud with the Torx Plus Maxx drive on both ends.

A proprietary version of Torx called Torx ttap was developed in 2006 and is licensed by Acument Intellectual Properties. It features a second recess to create a "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. Standard Torx drivers can be used to drive Torx ttap screws, but Torx ttap drivers will not fit standard Torx screws.

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.

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 It is available in five sizes: AW 10, AW 20, AW 25, AW 30 and AW 40.