Lox: Screws Designed for Power Tools". www.lox.com. Archived from the original on 2017-12-09 . Retrieved 2017-12-24. The 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was part of the obsolete, U.S-designed Optimum Metric Fastener System and was defined by ASTM B18.2.7.1M, which was withdrawn in 2011, [81] making the spline drive obsolescent. Wilder, George. "What are the differences between the two types of drive– Phillips and Posidriv?" (PDF). v8register. Archived (PDF) from the original on 2016-04-09 . Retrieved 2017-09-02. The Slotted/Pozidriv is slightly different from the Slotted/Phillips (PH/S), and good use requires special screwdrivers. [ citation needed] ACR Phillips II Plus [ edit ]

Clutch Head Bit Set (Set of 4)". Vintage Trailer Supply. Archived from the original on 2020-08-13 . Retrieved 2020-09-05. The applicable standards that govern the Torq-set geometry are National Aerospace Standard NASM 33781 and NASM 14191 for the ribbed version. The ribbed version is also known as ACR Torq-set. [84] Tri-angle [ edit ]Machinery's Handbook (PDF) (27thed.). Industrial Press, Inc. 2004. p.1596. Archived from the original (PDF) on 8 September 2017 . Retrieved 8 September 2017. The Ultra-Lok, and Ultra-Lok II are some of these designs that use custom keyed drivers, which tend to be confined to industrial and institutional uses that are unavailable to the average layperson. Key-Rex screws are another design, and are used in such things as ballot boxes and bank vaults. [41] Frauenfelder, Mark (2011-01-20). "Apple's diabolical plan to screw your iPhone". Boing Boing. Archived from the original on 2011-01-23 . Retrieved 2011-01-23. Don’t miss out! Join the Halfords Motoring Club today to access a range of amazing benefits and discounts that are designed to keep you moving, keep you safe and keep you saving. When a Phillips is not a Phillips!". Instructables.com. Archived from the original on 2011-08-27 . Retrieved 2011-08-01.

Screw head types / Product Guides / Service / Information & Services / England / Home— Wiha | Screwdrivers L-Keys Bits Pliers Online Shop| Premium Tools for Professionals". 2008-02-13. Archived from the original on 2008-02-13 . Retrieved 2012-03-12.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. The Supadriv (sometimes spelled incorrectly as "Supadrive") screw drive is very similar in function and appearance to Pozidriv. It is a later development by the same company. The description of the Pozidriv head applies also to Supadriv. While each has its own driver, [26] the same screwdriver heads may be used for both types without damage; for most purposes it is unnecessary to distinguish between the two drives. Pozidriv and Supadriv screws are slightly different in detail; the later Supadriv allows a small angular offset between the screw and the screwdriver, while Pozidriv has to be directly in line. [25] [27] [28] McMaster-Carr catalog (116thed.). p.2821. Archived from the original on 2019-12-14 . Retrieved 2011-09-26. Needs login a b Editors (April, May 1913). "Goodwin's Hollow Safety Set Screw" Hardware Dealers' Magazine. pp. 846 V, 865, 1090