Digest, Reader's (2003). Family Handyman Best Projects, Tips and Tools. Reader's Digest. p.106. ISBN 978-0-7621-0455-0. Archived from the original on 2016-12-24 . 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

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.Phillips Fastener". Phillips Fastener. Archived from the original on 2020-10-23 . Retrieved 2020-09-05.

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. Machinery's Handbook (PDF) (27thed.). Industrial Press, Inc. 2004. p.1596. Archived from the original (PDF) on 8 September 2017 . Retrieved 8 September 2017. Spanner-Bolts". Loss Prevention Fasteners. Ultra Fasteners Inc. Archived from the original on 2015-09-26 . Retrieved 2015-09-25. 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]

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. Phillips screwdrivers have an X-shaped tip that is made to fit inside the X-shaped notch of a compatible Phillips head screw. These tools were developed in the 19th century as an improvement over flathead screwdrivers because the shape of the screwdriver head provides better traction or grip when you are driving or removing screws. Similar to flathead screwdrivers, there are a wide range of sizes and lengths for Phillips screwdrivers and they also come in both manually driven and electric options. While Phillips screwdrivers do provide better control and driving power, the tip can still slip out of the screw head if it is driven with too much force. Go slow to ensure that the screwdriver tip grips the screw properly to avoid stripping the screw head.

Some consumer appliances, such as espresso machines from Jura Elektroapparate, use a proprietary screw head with an eccentric oval to dissuade owners from servicing their own machines. About Bristol Wrench Spline Drive Bits". 2016-10-21. Archived from the original on 2016-10-21 . Retrieved 2019-11-23. Ryder Windham (2006). You Know You're in Rhode Island When...: 101 Quintessential Places, People, Events, Customs, Lingo, and Eats of the Ocean State. Globe Pequot Press. pp.60ff. ISBN 978-0-7627-3940-0.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.