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2. Fastener - Wikipedia

   en.wikipedia.org/wiki/Fastener

   A fastener (US English) or fastening (UK English) [1] is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or dismantled without damaging the joining components. [2]

3. Wall plug - Wikipedia

   en.wikipedia.org/wiki/Wall_plug

   [4] [6] Other varieties of wall plug are mechanical anchors for heavy duty loads and hollow wall fixings for fixing to plasterboard. The first mechanical anchor, the Rawlbolt, was designed in the 1930s by the Rawlplug company and the first fixing for hollow walls was the Toggle Bolt, which was also designed by Rawlplug in 1941.

4. Anchor bolt - Wikipedia

   en.wikipedia.org/wiki/Anchor_bolt

   Column-to-foundation connection [1] Anchor bolts are used to connect structural and non-structural elements to concrete. [2] The connection can be made by a variety of different components: anchor bolts (also named fasteners), steel plates, or stiffeners. Anchor bolts transfer different types of load: tension forces and shear forces. [3]

5. Rail fastening system - Wikipedia

   en.wikipedia.org/wiki/Rail_fastening_system

   Common sizes are from 9 ⁄ 16 to 10 ⁄ 16 inch (14 to 16 mm) square and 5 + 1 ⁄ 2 to 6 inches (140 to 150 mm) long. [ 10 ] : 582–583 A rail spike is roughly chisel-shaped and with a flat edged point; the spike is driven with the edge perpendicular to the grain, which gives greater resistance to loosening. [ 11 ]

6. Concentric reducer - Wikipedia

   en.wikipedia.org/wiki/Concentric_reducer

   A copper concentric reducer. A concentric reducer is used to join pipe sections or tube sections on the same axis. [1] The concentric reducer is cone-shaped, and is used when there is a shift in diameter between pipes. [1] For example, when a 1" pipe transitions into a 3/4" pipe and the top or bottom of the pipe doesn't need to remain level. [2]

7. Eccentric reducer - Wikipedia

   en.wikipedia.org/wiki/Eccentric_reducer

   They are used where the diameter of the pipe on the upstream side of the fitting (i.e. where flow is coming from) is larger than the downstream side, and where there is a danger that vapour may accumulate. [1] Unlike a concentric reducer, which resembles a cone, eccentric reducers have an edge that is parallel to the connecting pipe, referred ...