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  2. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    In Japan, the male sizes are often designated as DTC-20, DTC-27, DTC-40 (discontinued) and DTC-45 corresponding to a respective screw head size of 3.2 mm, 4.6 mm, 6.4 mm and 7.7 mm; with the size of the screw measured across the widest portion of the mating part of the head. The most common sizes in use for consumer electronics are DTC-20 and ...

  3. Allen (brand) - Wikipedia

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

    In January 2017, Apex Tool Group announced they would end the manufacturing of Allen and Armstrong hand tools in their Sumter, South Carolina manufacturing plant. With this, Apex Communications Director Kelly Rhoads confirmed the line would cease production on March 31. This ended production of the Allen brand in hex keys, L-key, and T-handle ...

  4. Torx - Wikipedia

    en.wikipedia.org/wiki/Torx

    A security Torx L-key and fastener with holes for a safety pin to hinder disassembly with an ordinary Torx key. A Torx T8 screw head on a hard disk drive.. Torx (pronounced / t ɔːr k s /) is a trademark for a type of screw drive characterized by a 6-point star-shaped pattern, developed in 1967 [1] by Camcar Textron.