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2. Socket wrench - Wikipedia

   en.wikipedia.org/wiki/Socket_wrench

   For example, a 1 ⁄ 4-inch to 3 ⁄ 8-inch adapter allows sockets with 1 ⁄ 4-inch drive holes to attach to a 3 ⁄ 8-inch ratchet, and so on. Universal joints are two articulated socket joints (about 1 inch (25 mm) long) combined at a right angle, that allow a bend in the turning axis of the wrench and socket. They are used with extensions ...

3. Rivet - Wikipedia

   en.wikipedia.org/wiki/Rivet

   The most common machine is the impact riveter and the most common use of semi-tubular rivets is in lighting, brakes, ladders, binders, HVAC duct-work, mechanical products, and electronics. They are offered from 1/16-inch (1.6 mm) to 3/8-inch (9.5 mm) in diameter (other sizes are considered highly special) and can be up to 8 inches (203 mm) long.

4. Flat (theatre) - Wikipedia

   en.wikipedia.org/wiki/Flat_(theatre)

   Hollywood or studio flats can be made in various thicknesses to suit a particular design, but are most often made of 1-by-3-inch (25 mm × 76 mm) nominal (3 ⁄ 4 by 2 + 1 ⁄ 2 inches, 19 mm × 64 mm actual) pine boards. The boards are laid out on edge on the shop floor, the ends are glued together and stapled or screwed.

5. Riser clamp - Wikipedia

   en.wikipedia.org/wiki/Riser_clamp

   A riser clamp is a type of hardware used by mechanical building trades for pipe support in vertical runs of piping (risers) at each floor level. The devices are placed around the pipe, and integral fasteners are then tightened to clamp them onto the pipe.

6. Bolted joint - Wikipedia

   en.wikipedia.org/wiki/Bolted_joint

   The clamp load, also called preload of a fastener, is created when a torque is applied, and so develops a tensile preload that is generally a substantial percentage of the fastener's proof strength. Fasteners are manufactured to various standards that define, among other things, their strength.

7. 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.