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2. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   A die cuts an external thread on cylindrical material, such as a rod, which creates a male threaded piece that functions like a bolt. Dies are generally made in two styles: solid and adjustable. An adjustable die may be adjusted either by an integrated screw or by a set of screws set in to the die holder (termed a "die stock").

3. Die (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Die_(manufacturing)

   Die shoes (holders) – the set of flat, parallel plates that serve as the foundation for mounting die components. [4] Guide pins (pillars) – together with guide bushings, the pins align the die shoes precisely during each press stroke. [4] Die set (plates). [5] Placement can be inverted depending on the operation, such as use of a knock-out: [6]

4. Spring pin - Wikipedia

   en.wikipedia.org/wiki/Spring_pin

   A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole.

5. Tracing wheel - Wikipedia

   en.wikipedia.org/wiki/Tracing_wheel

   The teeth can be either serrated or smooth. It is used to transfer markings from sewing patterns onto fabric with or without the use of tracing paper, [1] and can be used to make slotted perforations. Such markings might include pleats, darts, buttonholes, notches or placement lines for appliques or pockets.

6. Threading (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Threading_(manufacturing)

   In manufacturing, threading is the process of creating a screw thread.More screw threads are produced each year than any other machine element. [1] There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative methods (rolling and forming; molding and casting); additive methods (such as ...

7. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   Self-tapping screws can be divided into two classes: [3] those that displace material (especially plastic and thin metal sheets) without removing it, known as "thread-forming" self-tapping screws, and self-tappers with sharp cutting surfaces that remove the material as they are inserted, termed "thread-cutting" self-tapping screws.