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2. F-clamp - Wikipedia

   en.wikipedia.org/wiki/F-clamp

   F-clamps. An F-clamp, also known as a bar clamp or speed clamp, is a type of clamp. The name comes from its "F" shape. This tool is used in woodworking while more permanent attachment is being made with screws or glue, or in metalworking to hold pieces together for welding or bolting. F-clamps are similar to but distinct from C-clamps and pipe ...

3. Parallel (engineering) - Wikipedia

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

   Generally, workshop parallels have 4 faces that are machined and ground - the front, back and sides, although some do have the ends with a smooth surface. The surface of a parallel can often tell how it was manufactured, with a 'grain' showing that it was ground - and a smooth or mirrored finish showing it has been lapped.

4. Clamp (tool) - Wikipedia

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

   Upper row: F-clamp or bar clamp, one-handed bar clamp ("Quick Grip"), wooden handscrew; Lower row : spring clamp, C-clamp (G-clamp ), wooden cam clamp A clamp is a fastening device used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure .

5. Chuck (engineering) - Wikipedia

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

   A drill chuck is a specialised self-centering, three-jaw chuck, usually with capacity of 0.5 in (13 mm) or less, and rarely greater than 1 in (25 mm), used to hold drill bits or other rotary tools. This type of chuck is used on tools ranging from professional equipment to inexpensive hand and power drills for domestic use.

6. Hose clamp - Wikipedia

   en.wikipedia.org/wiki/Hose_clamp

   The clamp is placed over the end of the hose or tube to be connected and when each ear is closed at the base of the ear with a special pincer tool, it permanently deforms, pulling the band, and causing the band to tighten around the hose. The size of clamp should be chosen such that the ear(s) are almost completely closed on installation.

7. Rail fastening system - Wikipedia

   en.wikipedia.org/wiki/Rail_fastening_system

   In the 1830s rolled T-shaped (or single-flanged T parallel rail) and I-shaped (or double-flanged T parallel or bullhead) rails were introduced; both required cast-iron chairs to support them. [36] Originally, iron keys were used to wedge the rail into the vertical parallel jaws of the chair; these were superseded by entirely wooden keys. [36]