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2. Spacers and standoffs - Wikipedia

   en.wikipedia.org/wiki/Spacers_and_standoffs

   In general, a spacer is a solid material used to separate two parts in an assembly. Spacers can vary in size from microns to centimeters. They can be made of metal, plastic, glass, and other materials. Shapes include flat sheet, cylindrical and spherical. Two sizes of metal standoffs and one plastic standoff.

3. Rebar spacer - Wikipedia

   en.wikipedia.org/wiki/Rebar_spacer

   A concrete spacer with a plastic clip in use Concrete spacers in a precast element Diaphragm wall block on rebar for a Diaphragm wall. A rebar spacer is a short, rod-like device used to secure reinforcing steel bars, or rebar, within cast assemblies for reinforced concrete structures. The rebar spacers are fixed before the concrete is poured ...

4. Washer (hardware) - Wikipedia

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

   Other uses are as a spacer, spring (Belleville washer, wave washer), wear pad, preload indicating device, locking device, and to reduce vibration (rubber washer). Washers are usually metal or plastic. High-quality bolted joints require hardened steel washers to prevent the loss of pre-load due to brinelling after the torque is applied.

5. Shim (spacer) - Wikipedia

   en.wikipedia.org/wiki/Shim_(spacer)

   A shim is a thin and often tapered or wedged piece of material, used to fill small gaps or spaces between objects. [1] Shims are typically used in order to support, adjust for better fit, or provide a level surface. Shims may also be used as spacers to fill gaps between parts subject to wear.

6. Warm edge - Wikipedia

   en.wikipedia.org/wiki/Warm_edge

   A warm edge spacer is a type of spacer bar used in insulated glazing. It separates the panes of glass in double or triple glazing, or curtain walling and seals off the air cavity between each. Recent warm edge spacers are generally made from plastics, although stainless steel can meet the definition. [1]

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9. Rebar - Wikipedia

   en.wikipedia.org/wiki/Rebar

   Rebar (short for reinforcing bar), known when massed as reinforcing steel or steel reinforcement, [1] is a tension device added to concrete to form reinforced concrete and reinforced masonry structures to strengthen and aid the concrete under tension.