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  2. Yankee screwdriver - Wikipedia

    en.wikipedia.org/wiki/Yankee_screwdriver

    The trade name "Yankee" screwdriver was first marketed by North Brothers Manufacturing Company in ≈16 April 1895, with the No. ≠130 spiral ratchet screwdriver. Yankee soon became and still is a well-known name in automatic spiral ratchet screwdrivers , with several other models, and model improvements patented by North Bros. over a 40-year ...

  3. Wrench size - Wikipedia

    en.wikipedia.org/wiki/Wrench_size

    Sizes that may interchange, depending on the precision needed, include 2 mm (close to 5 ⁄ 64 inch (1.98 mm)), 4 mm (close to 5 ⁄ 32 inch (3.97 mm)) and 8 mm (close to 516 inch (7.94 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.

  4. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    Spline drives were specified for 5, 6.3, 8, 10, 12, 14, 16, and 20 mm size screws. [86] Its primary advantage is its ability to resist cam-out , so it is used in high-torque applications, such as tamper-proof lug nuts , cylinder head bolts, and other engine bolts.

  5. British Standard Whitworth - Wikipedia

    en.wikipedia.org/wiki/British_Standard_Whitworth

    The sides are at a flank angle of Θ = 27.5° perpendicular to the axis. Thus, if the thread pitch is p , the height of the fundamental triangle is H = p /(2tan Θ ) = 0.96049106 p . However, the top and bottom 1 ⁄ 6 of each of these triangles is cut off, so the actual depth of thread (the difference between major and minor diameters) is 2 ...

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Crescent (brand) - Wikipedia

    en.wikipedia.org/wiki/Crescent_(brand)

    [4] [5] There was a rumor that Richard Evelyn Byrd, on his initial journey to Alaska, had a Crescent wrench in his provisions. [3] The Crescent Tool Company was acquired by a group of investors from Schoellkopf, Hutton & Pomeroy in 1960 after Marvin Peterson, Karl's son, sold it. [5] The combined company was renamed the Crescent Niagara ...

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