a b c d Capotosto, Rosario (December 1996). "Screwdriver Basics". Popular Mechanics. 173 (12): 82–83. ISSN 0032-4558. Archived from the original on 2017-02-16 . Retrieved 2016-09-24. A U-drive screw has a helical thread with an angle acute enough to be driven by a hammer or pressure from an arbor press, and thus has a domed head with no means of turning it. [92] These are most frequently driven into plastics with a pre-drilled pilot hole. 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.

There are various types of drill bits available for different materials. Installer bits are designed specifically for installing wiring. The drill bit has a hole in the side which is used for feeding wiring through the drilled hole. This is a great option for specialized tasks. ConclusionC) and (D) show tip cross-section when looking straight at the tip. Philips has a slightly larger radius (3), which prevents it from fitting properly into JIS screws. 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.

United States Maritime Service Institute. (1949). Engine Room Tools. New York: Mast Magazine Association. p. 25 The Phillips head was adopted by Ford and was unfortunately spread through Europe (and the rest of the world) via WWII equipment. I have never used a Robertson but I have read much about it and I have lamented for years about the awful slut, I mean slot head screw and the the commonly “cammed out” Phillips. Oh for a world full of Robertson heads and the drivers of course. Not very) fun fact: DIN stands for “Deutsches Institut fur Normung” (German Institute for Standardization). National Bureau of Standards. (1942) National Bureau of Standards Handbook H28, Screw Thread Standards for Federal Services. pp. 177, 179, 182, 184You can identify the size required for a random screw by measuring the width of the slot and comparing it to a Torx sizing chart. Torx Sizes Chart Torx Size