1/2" Drive Hex/Allen Key bit Socket Set Metric Sizes 4mm - 19mm AT659

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Means for uniting a screw with a driver". US Patent and Trademark Office. US Government. Archived from the original on 5 March 2016 . Retrieved 28 February 2016.

Improvements in or relating to screw threaded fasteners and drivers for use therewith". Google Patents. 1962-05-04. Archived from the original on 2020-01-26 . Retrieved 2017-10-13. a b c d e f g h i Higgins, Matt (September 16, 2015). "What is the Difference: Screw Bits– Phillips vs. Pozidriv". Fine Homebuilding. 154 (November 2015): 38. Archived from the original on 2016-04-19 . Retrieved 2015-09-25. The term "hex key" is best known as " Allen" in the English-speaking countries like the UK, Australia, Canada and the U.S. (The "Allen" name is a registered trademark, originated by the Allen Manufacturing Company of Hartford, Connecticut circa 1910, [1] now owned by Apex Tool Group, LLC, which was acquired by Bain Capital in 2014), and also in Spain and Mexico ( llave Allen, in Spain pronounced with Spanish double L, /ʎaβe aʎen/). Call Allen Ford Romford Service Centre Parts: 01708 917962 Service: 01708 917961 Bodyshop: 01708 242651The 12-spline flange screw drive has twelve splines in the fastener and tool. It consists of 12 equally spaced protrusions, each with a 60° angle. It is achieved overlaying 4 equilateral triangles, each one rotated 30° over the previous one. The spline drive was part of the obsolete, U.S-designed Optimum Metric Fastener System and was defined by ASTM B18.2.7.1M, which was withdrawn in 2011, [81] making the spline drive obsolescent. Combo drive". Klien Tools. 3 November 2014. Archived from the original on March 11, 2015 . Retrieved 1 July 2022.

The Pozidriv, sometimes incorrectly spelled "Pozidrive", is an improved version of the Phillips screw drive. It is designated "Type IA" by ANSI standards. [20] and "Type Z" in ISO documents. The Pozidriv was patented by GKN Screws and Fasteners in 1962. [21] [22] It was designed to allow more torque to be applied and greater engagement than Phillips drives. As a result, the Pozidriv is less likely to cam out. [10] [23] [24] It is similar to, and compatible with, the Supadriv screw drive. [25] Triple-square fasteners are referred to as "spline" in the UK. This is potentially confusing if looking for the more unusual 12-spline flange type. While they are distinguished under close inspection by the angle at the tip of each of the 12 points (with a 90° angle on the XZN, instead of 60°) the general similarity and ability to insert the wrong tool can cause damage to the head.ISO Fastener Standards Should Be Referenced for All Metric Fasteners" (PDF). Archived (PDF) from the original on 2021-06-26 . Retrieved 2021-10-16.

Hi-Torque slot drives were designed by Alcoa Fastening Systems, for situations where very high torque is needed, along with the ability to repeatedly install and remove the fastener. [7] The design features curved walls, unlike the straight-walled slot drive.The polydrive screw drive, also known as RIBE, [74] is spline-shaped with rounded ends in the fastener head. The tool has six flat teeth at equal spacing; the sizes are determined by the diameter of the star points. Its primary advantage over older screw drives is that it resists cam out. It is used primarily in the automotive industry in high-torque applications, such as brakes and driveshafts.

Alloy Artifacts, Various Tool Makers (section on Allen Manufacturing Company), archived from the original on 30 December 2011 , retrieved 25 January 2012.Palese, Jim (July 7, 2015). "Salient Features of Clutch Head Screws". The Mutual Screw Mantra. Archived from the original on 2016-05-29 . Retrieved 20 March 2021.