Most tamper-resistant screw configurations rely on the common unavailability of corresponding drivers to reduce the likelihood of widespread tampering. True tamper-proof - rather than merely resistant - screw drives include the breakaway head and one-way screw drives. In Japan, the male sizes are often designated as DTC-20, DTC-27, DTC-40 (discontinued) and DTC-45 corresponding to a respective screw head size of 3.2mm, 4.6mm, 6.4mm and 7.7mm; with the size of the screw measured across the widest portion of the mating part of the head. The most common sizes in use for consumer electronics are DCT-20 and DTC-27.

The term "hex-head" is sometimes used to refer to this type of drive, but this use is not consistent with its more conventional use referring to external-wrenching hexagons. Also called BNAE NFL22-070 after its Bureau de normalisation de l'aéronautique et de l'espace standard number. A cross-head screw with a two-step driver design, with the blade diameter stepping up at a distance from the point. Phillips Screw Company". Phillips-screw.com. Archived from the original on 2017-05-02 . Retrieved 2017-05-01. Burton, Walter E. (February 1946), "Hold Everything", Popular Science, New York, NY, USA, vol.148, no.2. ISO Fastener Standards Should Be Referenced for All Metric Fasteners" (PDF). Archived (PDF) from the original on 2021-06-26 . Retrieved 2021-10-16.

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A combination slotted/hex head cap is often used for self-tapping screws for metal, where the hex head enables greater torque during the initial self-tapping installation, while allowing the convenience of a slotted screwdriver to be used for removal and reinsertion.

A cross or double-slot screw drive has two slots, oriented perpendicular to each other, in the fastener head; a slotted screwdriver is still used to drive just one of the slots. This type is usually found in cheaply-made roofing bolts and the like, where a thread of 5mm (0.20in) or above has a large flattened pan head. The advantage is that they provide some measure of redundancy: should one slot be deformed in service, the second may still be used. Anyone else who spots something suspicious can always report it to our Customer Service team, so our Fraud team can investigate. Docter, Quentin; Dulaney, Emmett; Skandier, Toby (2006). CompTIA A+ Complete Study Guide. John Wiley and Sons. p.766. ISBN 978-0-470-04831-3. Archived from the original on 2017-02-21 . Retrieved 2016-09-24. National Bureau of Standards. (1942) National Bureau of Standards Handbook H28, Screw Thread Standards for Federal Services. pp. 177, 179, 182, 184 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.A Phillips screw head is slightly different from a PoziDriv; [10] see §Pozidriv section below for details. When a Phillips Is Not a Phillips Plus So Much More!". Instructables. Archived from the original on 2021-06-08 . Retrieved 2021-09-23. 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. Apple uses Y-type screws to secure the battery on the 2010 and 2011 MacBook Pro, as well as an extremely small type in the Apple Watch, iPhone 7 and iPhone X. [87] [88] This style of screw is often called a "tri-wing", although that name more properly belongs to a different design (see below).

Coin-slot drives are so-called because of the curved bottom of the recess, which facilitates driving them with a suitable coin. They are often used on items where the user is not likely to have a screwdriver when needed, such as recessed screws that attach cameras to tripod adapters, and battery compartments in some equipment such as children's toys. [ citation needed] Hi-Torque [ edit ] Tri-Wing Screwdriver. "Tri-wing screwdriver: Types". Triwingscrewdrivers.com. Archived from the original on 2012-03-23 . Retrieved 2012-03-12. While a Phillips screwdriver has slightly tapered flanks, a pointed tip, and rounded corners, a Pozidriv screwdriver has parallel flanks, a blunt tip, and additional smaller ribs at 45° to the main slots. The manufacturing process for Pozidriv screwdriver bits requires a slightly more complex cutter than that for Phillips, however both can be manufactured in four cuts from a tapered blank. The store is just a 1 minute drive time from Link Street, Exit 36 (Central Expressway) of US-75, North Central Expressway or Saint Andrew's Drive; a 5 minute drive from East Exchange Parkway, Chelsea Boulevard and East Stacy Road; or a 10 minute trip from Allen Drive and North Greenville Avenue. a b Radio Material School, Naval Research Laboratory. (1943). NAVPERS 14004 Mechanical Practice. Washington, D.C.: USGPO. pp. 48, 50, 51.Transactions of Technical Conference on Metric Mechanical Fasteners. American National Standards Institute. 1975. p.67. Archived from the original on 2021-04-15 . Retrieved 2020-10-26. Unlike JIS, the ISO 4757 standard for cross-head screws does not specify a dot on the screw head. [33] Phillips II [ edit ] Recessed head fastener and driver combination". Google Patents. 2015-12-11. Archived from the original on 2020-01-26 . Retrieved 2017-10-13.