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  2. P. L. Robertson - Wikipedia

    en.wikipedia.org/wiki/P._L._Robertson

    Illustration from the 1909 Canadian patent for the Robertson screw. Peter Lymburner Robertson (December 10, 1879 – September 28, 1951) was a Canadian inventor, industrialist, salesman, and philanthropist who popularized the square-socket drive for screws , often called the Robertson drive .

  3. Bolt (fastener) - Wikipedia

    en.wikipedia.org/wiki/Bolt_(fastener)

    Where a fastener forms its own thread in the component being fastened, it is called a screw. [3] This is most obviously so when the thread is tapered (i.e. traditional wood screws), precluding the use of a nut, [3] or when a sheet metal screw or other thread-forming screw is used. A screw must always be turned to assemble the joint.

  4. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily ...

  5. Speed nut - Wikipedia

    en.wikipedia.org/wiki/Speed_nut

    U-nut on the left, speed nut on the right to be used with a self-tapping screw. A speed nut, aka sheet metal nut or Tinnerman nut, is a type of locknut with two sheet metal prongs that act as one thread. They are made from spring steel.

  6. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood. Twinfast screw: A Twinfast screw is a type of screw with two threads (i.e. a twin-start screw), so that it can be driven twice as fast as a normal (i.e. single-start) screw with the same pitch. [4]

  7. Is Canadian Tire Corporation Limited’s (TSE:CTC.A) Balance ...

    www.aol.com/news/canadian-tire-corporation...

    Small and large cap stocks are widely popular for a variety of reasons, however, mid-cap companies such as Canadian Tire Corporation Limited (TSX:CTC.A), with a market cap of CA$11.88B, oftenRead ...

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