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2. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   breakaway bolt: A breakaway bolt is a bolt with a hollow threaded shank, which is designed to break away upon impact. Typically used to fasten fire hydrants, so they will break away when hit by a car. Also used in aircraft to reduce weight. cap screw: The term cap screw refers to many different things at different times and places. Currently ...

3. Bolted joint - Wikipedia

   en.wikipedia.org/wiki/Bolted_joint

   Chemical locking methods create friction after the breakaway torque. The prevail torque is usually higher than zero since the cured polymer still creates friction when rotating the nut. [citation needed] Safety wire (lockwire) Holes are drilled in nuts and bolt heads, and wire is threaded through the holes to prevent back-rotation.

4. Key (engineering) - Wikipedia

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

   If the hole and key are tapered, the key is referred to as a Dutch pin, which is driven in and optionally finished by cutting or grinding flush with the end of the shaft. If a straight Dutch keyway hole is optionally tapped with a thread, then an ordinary screw serves as the threaded Dutch key.

5. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Instead, a one-way screw can be removed by drilling a hole through the head of the screw and inserting a screw extractor. Alternatively, a rotary tool with cutting disk can be used to extend the slot, the head can be gripped with locking pliers, or the screw can be removed with a pin spanner (snake-eyes driver) after drilling two holes in the ...

6. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   The tapped hole (or nut) into which the screw fits, has an internal diameter which is the size of the screw minus the pitch of the thread. Thus, an M6 screw, which has a pitch of 1 mm, is made by threading a 6 mm shank, and the nut or threaded hole is made by tapping threads into a hole of 5 mm diameter (6 mm − 1 mm).

7. Pilot hole - Wikipedia

   en.wikipedia.org/wiki/Pilot_hole

   When a screw is driven into a material without a pilot hole, it can act as a wedge, generating outward pressure which can cause many materials to split. By drilling a small pilot hole into the material, into which a screw is then driven, less wedging takes place, thereby reducing the likelihood of the material being split. [2]