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2. Key (engineering) - Wikipedia

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

   Hollow spring pins provide a weaker shear strength than a solid dowel pin, and the strength may be varied by varying the wall thickness. This limited shear strength specification is designed to sustain normal operation, but then give way in the event of excessive shaft torque, thus protecting the rest of the machine from damage.

3. 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:

4. Glossary of locksmithing terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

   A security pin is a pin designed in a non-standard way to make picking the lock more difficult. [9] Examples of security pins include serrated pins, spools, and mushroom pins. [9] Shear line In a cylinder lock, the shear line (also known as the split line in Australia), is where the inner cylinder (plug) ends and the outer cylinder begins.

5. 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.

6. Nut (hardware) - Wikipedia

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

   Steel cross dowel or dowel nut, cross dowel (woodworking) A round slug or formed sheet metal part with threads perpendicular to the length of the nut Cage nut: Caged nut, captive nut, clip nut A (usually square) nut in a spring steel cage which wraps around the nut.

7. Punch (tool) - Wikipedia

   en.wikipedia.org/wiki/Punch_(tool)

   The tips of roll pin punches are not flat and should never be used on regular solid pins. If a roll pin punch is used on a solid pin, it will mar or mark the pin. If the end of a roll pin punch is damaged or deformed, it should be discarded. It is virtually impossible to regrind the tip of the roll pin punch and properly shape the center ...