NO.1 Phillips Drive Screwdriver

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a b Radio Material School, Naval Research Laboratory. (1943). NAVPERS 14004 Mechanical Practice. Washington, D.C.: USGPO. pp. 48, 50, 51.

A thumbscrew is a type of screw drive with either a tall head and ridged or knurled sides, or a key-like flat-sided vertical head. They are intended to be tightened and loosened by hand, and are usually not found in structural applications. They are sometimes also cut for Phillips head or slotted screwdrivers, as well as having the knurling for finger grip. ASME Standard 18.6.8 covers dimensions for Type A (shoulder under the head), regular and heavy, along with Type B (without shoulder), regular and heavy. They can be found on many computer cases, and in other locations where easy access without tools is desired. Some screws have heads designed to accommodate more than one kind of driver, sometimes referred to as combo-head or combi-head. The most common of these are a combination of a slotted/Phillips head. Phillips head screwdrivers come in sizes indicated by numbers rather than measurements, such as is the case with regular or flathead screwdrivers. Screws, too, are designated according to number, from 0 to 24. Screws may be machined to fit single-slotted drivers or crosshead drivers. Flathead, single-slotted drivers are measured in inches and fit a particular size of screw, in some cases more than one.Combo drive". Klien Tools. 3 November 2014. Archived from the original on March 11, 2015 . Retrieved 1 July 2022.

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] Avsafe". www.losspreventionfasteners.com. Archived from the original on 2017-03-01 . Retrieved 2017-02-28.The JIS B 1012 [29] was commonly found in Japanese made equipment, such as cameras and motorbikes. Superficially it looks like a Phillips screw with narrower and more vertical slots, to give less tendency to cam out. The bottom of the recess is flat, and the point of the driver has to be blunt. A Phillips screwdriver has the same 26.5 degree cone angle but because of the tapered slots will not seat fully, and will damage the screw if forced. Phillips head screwdrivers are also made in very small sizes. They are used in precision work and are not commonly included in standard toolsets. The following are screw drives based on a cruciform shape; i.e., a cross shape. Other names for these types of drives are cross recessed, cross-head, cross tip, and cross-point. A double slotted screw drive is not considered cruciform because the shape is not recessed, and consists only of two superimposed simple milled slots. Some of these types are specified in ISO 4757, Cross recesses for screws. Screw Holding Screw Driver" (PDF). Audiocraft Magazine: 7. April 1956. Archived (PDF) from the original on 2021-10-16 . Retrieved 2018-09-17.

Pozidriv and Phillips appear broadly interchangeable, but may cause damage if incorrectly used. Pozidriv screwdrivers will jam fit into Phillips screws, but when tightened they may slip or tear out the Phillips screw head. Conversely, while Phillips screwdrivers will loosely fit and turn Pozidriv screws, they will cam out if enough torque is applied, potentially damaging the screw head or screwdriver. [10] [23] Supadriv [ edit ] The earliest documented screwdrivers were used in the late Middle Ages. They were probably invented in the late 15th century, either in Germany or France. The tool's original names in German and French were Schraubenzieher [2] [3] [4] [ circular reference] (screw-tightener) and tournevis (turnscrew), respectively. The first documentation of the tool is in the medieval Housebook of Wolfegg Castle, a manuscript written sometime between 1475 and 1490. [5] These earliest screwdrivers had pear-shaped handles and were made for slotted screws (diversification of the many types of screwdrivers did not emerge until the Gilded Age). The screwdriver remained inconspicuous, however, as evidence of its existence throughout the next 300 years is based primarily on the presence of screws. 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. His invention revolutionized assembly lines and helped push the Industrial Revolution even further. Today, the Phillips head screwdriver is a DIYer's must-have and a toolbox favorite. 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 Acument Global Technologies, which as of 2010 includes Avdel, Camcar, Ring Screw, and others.

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This unique tip design is made specifically to fit into corresponding Phillips head screws, which have corresponding X-shaped slots where the screwdriver fits. This unique design creates a firm hold between the screw and screwdriver, which prevents slipping. What is the smallest Phillips size?

Oberg, E. Jones, F. Horton, H. (1984). Machinery's Handbook, 22nd ed. New York: Industrial Press Inc. pp. 1157, 1159 The Phillips screw drive (specified as an ANSI Type I Cross Recess [9] and type H in ISO documentation) was created by John P. Thompson, who, after failing to interest manufacturers, sold his design to businessman Henry F. Phillips. [10] [11] Phillips is credited with forming a company ( Phillips Screw Company), improving the design, and promoting the adoption of his product. [10] The original 1932 patent [12] expired in 1966, but the Phillips Screw Company continued to develop improved designs. [10] New Bolt Drives FCA to Better Seat Assembly". www.assemblymag.com. Archived from the original on 23 August 2019 . Retrieved 23 August 2019. a b Thompson, Avery (October 10, 2016). "11 Strange Screws You Don't See Every Day". Popular Mechanics. Archived from the original on August 4, 2020 . Retrieved September 5, 2020.a b c d e "screw drive systems". Sizes.com. 2010-12-30. Archived from the original on 2012-03-13 . Retrieved 2012-03-12. a b arcticpenguin (2008-12-29). "SupaDriv". Instructables.com. Archived from the original on 2012-03-24 . Retrieved 2012-03-12. JIS B 1012-1985 ねじ用十字穴 Cross Recesses for Screws". Archived from the original on 2023-03-22 . Retrieved 2023-05-01.