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2. Buttress thread - Wikipedia

   en.wikipedia.org/wiki/Buttress_thread

   In oil field tubing, buttress thread is a pipe thread form designed to provide a tight hydraulic seal. The thread form is similar to that of Acme thread [10] but there are two distinct threaded portions of differing diameters and profiles, the larger having a wedging profile, with a tapered sealing portion in between the larger and smaller diameters.

3. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood. Twinfast screw: A Twinfast screw is a type of screw with two threads (i.e. a twin-start screw), so that it can be driven twice as fast as a normal (i.e. single-start) screw with the same pitch. [4]

4. Hanger - Wikipedia

   en.wikipedia.org/wiki/Hanger

   Clothes hanger, a device in the shape of human shoulders or legs used to hang clothes on; Casing hanger, part of a wellhead assembly in oil drilling; Derailleur hanger, a slot in a bicycle frame where the derailleur bolt attaches; Tie (engineering), a type of structural member; Hanger, part of a skateboard

5. Set screw - Wikipedia

   en.wikipedia.org/wiki/Set_screw

   A set screw is often headless and threaded along its entire length, so that it will sit entirely inside that hole; in which case it may be called a grub screw or blind screw. Once fully and firmly screwed into the first object, the projecting tip of the set screw presses hard against the second object, acting like a clamp .

6. Wingnut (hardware) - Wikipedia

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

   A similar fastener with a male thread is known as a wing screw [1] [2] or a wing bolt. [3] Types.

7. Snap fastener - Wikipedia

   en.wikipedia.org/wiki/Snap_fastener

   The two halves of a riveted leather snap fastener. The top half has a groove which "snaps" in place when "pressed" into the bottom half. A snap fastener, also called snap button, press button, [1] press stud, [1] press fastener, dome fastener, popper, snap and tich (or tich button), is a pair of interlocking discs, made out of a metal or plastic, commonly used in place of traditional buttons ...