A Robertson screw, also known as a square screw[1] or Scrulox,[2] is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper. Originally designed to enable the screws to be made using cold forming of the heads,[3]: 79–81 the taper has two other advantages which have helped popularize it: it makes inserting the tool easier, and helps keep the screw on the tool without the user having to hold it there.[3] The Robertson screw is specified as ANSI Type III Square Center. The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly referred to as a Robertson in that it shares practically identical drive dimensions and the same colour identification system, however the contemporary square drive uses a driver with parallel sides whereas the true Robertson possesses slightly tapered sides that allowed for easier screw removal and initially simpler screw manufacture when stamping the recess into the screw. [citation needed]
^Kelsey, John; Kirby, Ian J. (2004). Furniture Projects for the Deck and Lawn. ISBN 9781892836175. Retrieved 12 March 2012.
^Robertson Inc. "Robertson Inc. – The Original Robertson Fastening System". Robertson Inc. main site. Retrieved 28 September 2011.
^ abRybczynski, Witold (2000). One good turn : a natural history of the screwdriver and the screw. New York [u.a.]: Scribner. ISBN 0-684-86729-X.
A Robertsonscrew, also known as a square screw or Scrulox, is a type of screw with a square-shaped socket in the screw head and a corresponding square...
At a minimum, a screw drive is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. Usually, it also involves...
industrial manufacture. Canadian P.L. Robertson, though he was not the first person to patent the idea of socket-head screws, was the first to successfully commercialize...
assembled with Torx or Pozidriv head screws, which have been specifically designed not to cam out. Robertsonscrews are commonplace in Canada, and significantly...
(Robertson). In the UK, the term "set screw" or "setscrew" refers simply to a bolt which is fully threaded, with no smooth shank; called cap screw in...
Canadian Peter Robertson for inventing the square-head screw that bears his name. The Robertsonscrew represented a significant advance in the history of...
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only 2 years after Robertson's Canadian patent.) This cost problem drove SPS to purchase its first screw machine and make its screws in-house, which led...
Jaime Royal "Robbie" Robertson OC (July 5, 1943 – August 9, 2023) was a Canadian musician. He was lead guitarist for Bob Dylan in the mid-late 1960s and...
more #6-32 UNC screws hold the main cover on the case They are almost always provided with a #2 Phillips drive. Sometimes a Green Robertson or Torx drive...
Naismith (1861–1939) – invented basketball P. L. Robertson (1879–1951) – invented the Robertsonscrew Henry Ruttan (1792–1871) – invented air-conditioned...
Angeles Kings goaltender Cam Talbot. Birthplace of Peter Robertson, inventor of the Robertsonscrew. Birthplace of Andrew Campbell, former Toronto Maple Leafs...
Steam frigates (including screw frigates) and the smaller steam corvettes, steam sloops, steam gunboats and steam schooners, were steam-powered warships...
(1846). "The paddle-Wheel and screw their comparative powers of speed". The Mechanic's Magazine. Vol. XLV. Robertson, London. p. 365-371. ISBN 978-1-347-61485-3...
(Written and directed by Su Rynard) Episode 12: Brilliant Amenities: The Robertsonscrew, plastic garbage bag and bear-proof trash bin (Written and directed...
Lomer–Cottrell junction. The two main types of mobile dislocations are edge and screw dislocations. Edge dislocations can be visualized as being caused by the...
1907. The Robertsonscrew is not common in the U.S. (where it is called the "square drive screw") but "accounts for over 75% of all screws sold in Canada"...
Thomas Morgan Robertson (born 14 October 1958), known by the stage name Thomas Dolby, is an English musician, producer, composer, entrepreneur and teacher...
creative control over ScrewAttack from him and making decisions regarding ScrewAttack without input from himself or other ScrewAttack members. Community-run...
lathes have only one leadscrew that serves all carriage-moving purposes. For screw cutting, a half nut is engaged to be driven by the leadscrew's thread; and...
Torx (pronounced /tɔːrks/) is a trademark for a type of screw drive characterized by a 6-point star-shaped pattern, developed in 1967 by Camcar Textron...
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