Its primary advantage over older screw drives is that it resists cam out. https://en.wikipedia.org/w/index.php?title=List_of_screw_drives&oldid=982829612#Slot, Articles with unsourced statements from December 2017, Articles with unsourced statements from February 2007, Articles with unsourced statements from July 2017, Articles with unsourced statements from May 2012, Articles with unsourced statements from February 2011, Articles with unsourced statements from June 2010, Articles with unsourced statements from May 2010, Articles with unsourced statements from February 2017, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 October 2020, at 16:28. Know Your Tools: The Flat-Head Screwdriver. A screw drive is a system used to turn a screw. The internal-wrenching square socket drive for screws (as well as the corresponding triangular socket drive) was conceived several decades before the Canadian P. L. Robertson invented the Robertson screw and screwdriver in 1906 and received the Canadian patent in 1907 (CA103387, U.S. Patent CA103387A ) and US patent 1911 (U.S. Patent 1,003,657 ) for a manufacturing machine. [26], Phillips II recesses are compatible with Phillips drivers, but have a vertical rib in between the cruciform recesses that interacts with horizontal ribs on a Phillips II driver to create a stick-fit, and to provide anti cam-out properties (the ribs are trademarked as "ACR" for Anti Cam-out Ribs). The applicable standards that govern the Torq-set geometry are National Aerospace Standard NASM 33781 and NASM 14191 for the ribbed version. It typically consists of a countersunk flat-head bolt, with a thin shank and hex head protruding from the flat head. The design is often criticized for its tendency to cam out at lower torque levels than other "cross head" designs. This is just one of the many inexpensive tools that you should have in your toolbox. Your recently viewed items and featured recommendations, Select the department you want to search in, KAKIBLIN Anti Flat Head Baby Pillow, Head Shaping Pillow for Infants Soft Head Support Pillow for 0-1 Year Old, Grey, Anti Flat Head Pillow For Newborn, KAKIBLIN Prevent Flat Head Pillow, Blue. At a minimum, it is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. [citation needed]. A hollow-ground screwdriver is less likely to cam out (leave the slot due to the torque being translated into an axial force — similar to that encountered with Phillips drive but dependent only on driver blade), so more torque can be applied without damaging the screw head. Even though the flat-head has been somewhat replaced by screw types like the Phillips head, square-drive heads, pozi-drive, and Torx-type heads, you'll still find the need to use a flat-head screwdriver from time to time.
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