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  2. Washer (hardware) - Wikipedia

    en.wikipedia.org/wiki/Washer_(hardware)

    This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminium or plastic, [8] and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth). There are four types: internal, external, combination ...

  3. Countersink - Wikipedia

    en.wikipedia.org/wiki/Countersink

    This may be required to allow the correct seating for a countersunk-head screw or to provide the lead in for a second machining operation such as tapping. Countersink cutters are manufactured with six common angles, which are 60°, 82°, 90°, 100°, 110°, or 120°, with the two most common of those being 82° and 90°.

  4. Self-tapping screw - Wikipedia

    en.wikipedia.org/wiki/Self-tapping_screw

    The countersunk head has a Pozidriv recess. A self-tapping screw is a screw that can tap its own hole as it is driven into the material. More narrowly, self-tapping is used only to describe a specific type of thread-cutting screw intended to produce a thread in relatively soft material or sheet materials, excluding wood screws.

  5. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    An external Torx screw has a projecting head in the shape of a Torx screwdriver bit (instead of a standard recessed cavity); a Torx socket is used to drive it. The external "E" Torx nominal sizing does not correspond to the "T" size (for example, an E40 socket is too large to fit a T40, while an E8 Torx socket will fit a T40 Torx bit [68 ...

  6. Belleville washer - Wikipedia

    en.wikipedia.org/wiki/Belleville_washer

    Belleville washer. A Belleville washer, also known as a coned-disc spring, [1] conical spring washer, [2] disc spring, Belleville spring or cupped spring washer, is a conical shell which can be loaded along its axis either statically or dynamically. A Belleville washer is a type of spring shaped like a washer.

  7. Keps nut - Wikipedia

    en.wikipedia.org/wiki/Keps_nut

    A Keps nut, (also called a k-lock nut [1] or washer nut), is a nut with an attached, free-spinning washer. It is used to make assembly more convenient. Common washer types are star-type lock washers, conical, and flat washers.

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