Irwin 10504354 Torx T25 x 25mm Screwdriver Bits (10 Pieces)

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The TORX(r) Drive System was invented by Camcar Textron in 1967. It was designed to provide an alternative to the slotted-head screwdrivers of the day. The patented system is trademarked by Acumen Intellectual Properties, LLC. Other manufacturers often use the Torx name to promote their products. The metric system is a good fit for larger distances. It is not as accurate for smaller distances. Tamper-Proof If you need to know which size of Torx is the right one for a specific project, take a look at the Torx bit sizes chart. It will tell you which Torx bits are compatible with which screws. KC Tool TORX PLUS Long arm L-Keys". Wiha Tools USA. Archived from the original on 7 October 2015 . Retrieved 14 July 2016.

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. [4] Torx screws are also becoming increasingly popular in construction industries. The most common sizes of a Torx screw are T10, T15, and T25. There are also specialized Torx sizes, including T47, T55, T60, and T65. These are used in certain circumstances, but they are not as common as the T10, T15, and T25.a b "TORX Drive System" (PDF). Textron Fastening Systems. Archived from the original (PDF) on 2007-01-02. Torx (pronounced / t ɔːr k s/) is a trademark for a type of screw drive characterized by a 6-point star-shaped pattern, developed in 1967 [1] by Camcar Textron. [a] 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. [2] 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. [3] The following is a Torx Bit Sizes Chart for Internal Torx. Two dimensions are important with respect to Torx screws. They are Point to Point and Diameter of the screw threads. Torx Size Technical Information on Fasteners: Design recommendations 11.1 Inside drives for screws – AW drive (AW-Antrieb)" (PDF). Adolf Würth GmbH & Co. KG . Retrieved 2 March 2017. Unlike other screwdrivers, Torx fasteners are made to be resistant to cam-out. This is a type of tampering that occurs when a torque is applied to a screw that exceeds its limit. The Torx bit creates a round hole to prevent this from occurring.

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. [30] It is available in five sizes: AW10, AW20, AW25, AW30 and AW40. [31] Gallery [ edit ] This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.a b c U.S. Patent 3,584,667, Bernard F. Reiland, "Coupling arrangement and tools for same", filed 1967-03-21 The most common sizes are T10 and T25. The head height is 0.062 inch (1.6 mm). The head diameter is 0.50 inch (1.27 cm). Some other specialized sizes include T55 and T27. The metric system is more widely used in other countries. In the United States, the Imperial system is still used. It is based on the Roman Empire's system, which considered one foot to be the length of a human being. This means that the same tool in metric units won't fit an Imperial nut. The most obvious SAE vs metric equivalent is the size of the Torx bit. These bits come in a variety of sizes and are typically not interchangeable. The smallest of the lot is the T10, which is about the size of a 1/8" hex. The largest is the T47, which is about the size of a quarter. These bits are designed to work in many thread systems. Using a Torx Bit Sizes Chart is a great way to know which size to buy for a specific fastener. The chart can help you understand the difference between metric and SAE, and can also tell you what size is a good fit for the job at hand. It can also help you choose between an external Torx and an inverted Torx. Torx Bit Sizes Chart

Pavlis, Egon (16 March 2010). "When a Phillips is not a Phillips Plus So Much More!". Instructables.Find sources: "Torx"– news · newspapers · books · scholar · JSTOR ( March 2013) ( Learn how and when to remove this template message) Whether you are buying a new set of Torx tools or replacing a broken one, you will need to make sure you buy the right size. There are three standard sizes of Torx, and each one can be distinguished by the T before a number. In addition to these, there are also specialized sizes that are designed for specific uses. You can browse the chart below to find the right tool for your project. Torx Paralobe is a further developed Torx Drive System with 6% longer Flanks which results in a 20% higher applicable torque. [15] Torx Plus [ edit ] Torx Plus head pattern TS Star Bits (5 Sided) 1/4"D 7pc - Part No. 3389 - Part of the TS Star/Torx* Plus range from Laser Tools" . Retrieved 14 July 2016. The Torx Plus, also known as the Internal Plus, is an improved version of the original design. This version is designed to provide better torque transfer than the original design. The lobes on the screw allow for increased torque without causing much wear on the tool.

The metric system is also the standard for airplanes and boats. To make the process of repairing vehicles easier, the SAE standardized the measuring system. It's also been adopted by major vehicle manufacturing hubs in other countries. 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. [29] External (inverted) Torx [ edit ] External Torx driverA Torx successor, Torx Plus, was introduced around 1990 when the original Torx patent was expiring. The Torx Plus patent subsequently expired in 2011. [16] [17] 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 [18] (sometimes listed as IP1 to IP100 [19]) 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. [18] 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. The SAE is an acronym for the Society of Automotive Engineers. It was created to standardize measurement in the engineering space. The SAE is now known as SAE International, and it has 138,000 members worldwide. The organization sets standards in North America for the construction and automobile industries. a b c d e "Chart of Torx fasteners and tools". Wiha Tools USA. Archived from the original on 2015-12-26 . Retrieved 2012-01-14. Tamper-Resistant TORX PLUS Drive System" (PDF). Textron Fastening Systems. Archived from the original (PDF) on 2006-11-10.