Editing Screwdriver (section)

===Slotted===
[[File:Big flat screwdriver.jpg|thumb|Screwdriver with rubber handle]]
The tool used to drive a '''slotted''' screw head is called a ''standard'', ''common blade'', ''flat-blade'', ''slot-head'', ''straight'', ''flat'', ''flat-tip'',<ref name="capotosto">{{Citation |last=Capotosto |first=Rosario |title=Screwdriver Basics |journal=[[Popular Mechanics]] |volume=173 |issue=12 |pages=82–83 |date=December 1996 |url=https://books.google.com/books?id=R2YEAAAAMBAJ&pg=PA82 |issn=0032-4558 |postscript=. |url-status=live |archive-url=https://web.archive.org/web/20170216031252/https://books.google.com/books?id=R2YEAAAAMBAJ&pg=PA82 |archive-date=2017-02-16 }}</ref> or "''flat-head''"<ref>{{cite book |last=Review |first=Princeton |title=Cracking the ASVAB |publisher=Random House |location=New York |year=2004 |page=[https://archive.org/details/crackingasvab00prin/page/174 174] |url=https://archive.org/details/crackingasvab00prin |url-access=registration |isbn=978-0-375-76430-1 }}</ref> screwdriver. This last usage can be confusing, because the term ''flat-head'' also describes a screw with a flat top, designed to install in a [[countersink|countersunk hole]].  Before the development of the newer bit types, the flat-blade was called the "Common-Blade", because it was the most common one. Depending on the application, the name of this screwdriver may differ. Within the automotive/heavy electric industries, it is known as a "flat head screwdriver";<ref name="Chilton 2001">{{cite book |last=Chilton |first=G. |title=Homebasics: the complete guide to running today's home |publisher=Barnes & Noble Books |year=2001 |isbn=978-0-7607-2719-5 |url=https://archive.org/details/homebasicscomple0000chil |url-access=registration |access-date=27 September 2018 |page=[https://archive.org/details/homebasicscomple0000chil/page/18 18]}}</ref> within the avionics and mining industries, it is known as a "standard screwdriver".<ref name="Richards Stephenson 1984">{{cite book |last1=Richards |first1=A.J. |last2=Stephenson |first2=J.H. |title=Avionic Navigation Systems Specialist |publisher=Extension Course Institute, Air University |year=1984 |url=https://books.google.com/books?id=NZTgrJRYYPQC |access-date=27 September 2018 |page=169 |archive-date=30 May 2020 |archive-url=https://web.archive.org/web/20200530010403/https://books.google.com/books?id=NZTgrJRYYPQC |url-status=live }}</ref> Though there are many names; the original device from 1908 was known as a "flat-head screw turner".{{citation needed|date=August 2017}}

Among slotted screwdrivers, variations at the blade or bit end involve the profile of the blade as viewed face-on (from the side of the tool).  The more common type is sometimes called '''keystone''', where the blade profile is slightly flared before tapering off at the end, which provides extra stiffness to the workface and makes it capable of withstanding more torque by gripping deeper in the screw slot.  To maximize access in space-restricted applications, the ''cabinet'' variant screwdriver blade sides are straight and parallel, reaching the end of the blade at a right angle. This design is also frequently used in jeweler's screwdrivers.

Many textbooks and vocational schools{{Who|date=January 2023}} instruct mechanics to grind down the tip of the blade, which, due to the taper, increases its thickness and consequently allows more precise engagement with the slot in the screw. This approach creates a set of graduated slotted screwdrivers that will fit a particular screw for a tighter engagement and reduce screw head deformation.  However, many better-quality screwdriver blades are already [[induction hardening|induction-hardened]] (surface heat-treated), coated with black-oxide, black-phosphate, or diamond-coated to increase friction between the screwdriver tip and the screw.<ref>{{cite web | url=https://www.bobvila.com/articles/best-screwdriver-set/#:~:text=Black-oxide%2C%20black-phosphate%2C%20and%20diamond-coated%20tips%20increase%20friction%20between,their%20increased%20grip%20strength%20when%20driving%20a%20screw | title=The 10 Best Screwdriver Sets of 2023, Tested and Reviewed | date=15 April 2020 }}</ref> Thus tip grinding after manufacture will likely compromise their durability so it is best to select the proper tip and avoid weakening the manufacture's treatments.