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  2. Child harness - Wikipedia

    en.wikipedia.org/wiki/Child_harness

    A child harness (alternative: child tether, walking harness, British English: walking reins) is a safety device sometimes worn by children when walking with a parent or carer. Child harnesses are most commonly used with toddlers and children of preschool age, though they may also be used with older children, especially if they have special ...

  3. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Schematic of a machine tap. Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

  4. Tap wrench - Wikipedia

    en.wikipedia.org/wiki/Tap_wrench

    The clamp is opened to insert the tool and then tightened down against the tool to secure it. This type of tap wrench is used with larger taps and where there is room to turn a larger wrench. [1] A T-handle is more compact. This type of wrench uses a collet to secure the tool. The collet design has two pieces: a threaded "nosecap" and four ...

  5. 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.

  6. Threaded insert - Wikipedia

    en.wikipedia.org/wiki/Threaded_insert

    TIME-SERT insert. A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. [1] They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work piece thereby eliminating a machining operation, or ...

  7. Pipe wrench - Wikipedia

    en.wikipedia.org/wiki/Pipe_wrench

    Daniel C. Stillson (1826-1899), a mechanic at the Walworth Company, in Cambridge, Massachusetts, created the first such wrench. [1] On October 12, 1869, US patent #95,744 was issued to Stillson. [2] On 17 August 1888, the Swedish inventor Johan Petter Johansson (1853-1943) took out his first patent on the adjustable pipe wrench. [3]

  8. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    So a 1 / 2 in (12.7 mm) diameter drill will be able to drill a hole 4 + 1 / 2 in (114.3 mm) deep, since it is 9 times the diameter in length. A 1 / 8 in (3.175 mm) diameter drill can drill a hole 1 + 5 / 8 in (41.275 mm) deep, since it is 13 times the diameter in flute length. [3]

  9. Rotary table (drilling rig) - Wikipedia

    en.wikipedia.org/wiki/Rotary_table_(drilling_rig)

    In this simple diagram of a drilling rig, #20 (in blue) is the rotary table. The kelly drive (#19) is inserted through the center of the rotary table and kelly bushings, and has free vertical (up & down) movement to allow downward force to be applied to the drill string, while the rotary table rotates it.

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