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2. Taper pin - Wikipedia

   en.wikipedia.org/wiki/Taper_pin

   A taper pin is a fastener used in mechanical engineering. They are steel rods with one end having a slightly larger diameter than the other. Metric taper pins have a taper of 1:50. [1] A 1:50 taper means that one end of a 50 mm long bar will be 1 mm smaller in diameter than the other end.

3. Drift pin - Wikipedia

   en.wikipedia.org/wiki/Drift_pin

   The tapered drift pin is used to align the two bolt holes in two separate components that are designed to mate. First the two components are maneuvered until the holes in each are in semi-alignment, such that the narrow end of the tapered drift pin can be inserted through the two holes.

4. Treenail - Wikipedia

   en.wikipedia.org/wiki/Treenail

   A treenail, also trenail, trennel, or trunnel, is a wooden peg, pin, or dowel used to fasten pieces of wood together, especially in timber frames, covered bridges, wooden shipbuilding and boat building. [1] It is driven into a hole bored through two (or more) pieces of structural wood (mortise and tenon).

5. Dowel - Wikipedia

   en.wikipedia.org/wiki/Dowel

   Wooden dowel pins. The dowel is a cylindrical shape made of wood, plastic, or metal. In its original manufactured form, a dowel is long and called a dowel rod, which are often cut into shorter dowel pins. [citation needed] Dowels are commonly used as structural reinforcements in cabinet making and in numerous other applications, including:

6. Nail (fastener) - Wikipedia

   en.wikipedia.org/wiki/Nail_(fastener)

   Thumbtack (or "push-pin" or "drawing-pin") are lightweight pins used to secure paper or cardboard. Casing nails – have a head that is smoothly tapered, in comparison to the "stepped" head of a finish nail. When used to install casing around windows or doors, they allow the wood to be pried off later with minimal damage when repairs are needed ...

7. Key (engineering) - Wikipedia

   en.wikipedia.org/wiki/Key_(engineering)

   The tapered key is tapered only on the side that engages the hub. The keyway in the hub has a taper that matches that of the tapered key. Some taper keys have a gib, or tab, for easy removal during disassembly. The purpose of the taper is to secure the key itself, as well as to firmly engage the shaft to the hub without the need for a set screw.