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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. Pruning shears - Wikipedia

    en.wikipedia.org/wiki/Pruning_shears

    Professional pruning shears often have replaceable blades. There are three different blade designs for pruning shears: anvil, bypass and parrot-beak. Anvil pruners have only one blade, which closes onto a flat surface; unlike bypass blades it can be sharpened from both sides and remains reliable when slightly blunt. Anvil pruners are useful for ...

  4. Loppers - Wikipedia

    en.wikipedia.org/wiki/Loppers

    Anvil loppers have a single sharpened blade, with a straight or sometimes curved edge, that closes against a similarly contoured flat anvil like surface on the other side of the jaws, usually made of a softer metal than the blade. Anvil loppers have the disadvantage of tending to crush rather than cut, sometimes leaving an untidy wound, more ...

  5. Shear (sheet metal) - Wikipedia

    en.wikipedia.org/wiki/Shear_(sheet_metal)

    Close-up of upper blade, lower blade, backgauge and work-holding device of a Gasparini guillotine shear The design of press tools is an engineering compromise. A sharp edge, strength, and durability are ideal, but a sharp edge is not very strong or durable, so blades for metal work tend to be square-edged rather than knife-edged .

  6. Socket wrench - Wikipedia

    en.wikipedia.org/wiki/Socket_wrench

    Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.

  7. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    where is the tap drill size, is the major diameter of the tap (e.g., 3 ⁄ 8 in for a 3 ⁄ 8-16 tap), and / is the thread pitch (1 ⁄ 16 inch in the case of a 3 ⁄ 8-16 tap). For a 3 ⁄ 8-16 tap, the above formula would produce 5 ⁄ 16, which is the correct tap drill diameter. The above formula ultimately results in an approximate 75% thread.