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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.
A standoff is a threaded separator of defined length used to raise one part in an assembly above another. They are usually round or hex (for wrench tightening), often made of aluminum, brass, or nylon, and come in male-female or female-female forms. In electronics they are frequently used to raise a printed-circuit board above a surface. Insulating standoffs keep two parts from touching each other, thereby preventing electrical shorts. When used to fasten cable connectors (e.g., "D" connectors) together, they are called jack Screws.
Both Spacers and Standoffs come in Round and Hex shapes with male and female threads. Knurling on the outside surface can also be done to provide sturdier grip.
In contrast, some spacers may look similar to standoffs but are unthreaded pieces of tubing which let the entire bolt pass through. Since they cannot be tightened, they are usually round.
sign standoffs, hex standoffs, standoff spacer
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