What do spacers do for bolts?

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.

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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 stainless steel, 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. In some cases (e.g., D-subminiature connectors), short standoffs may be used to receive the jackscrews that lock the connection together.

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.[1]

Audio visual equipment (e.g., AV amplifiers) can utilise extra space above or below their mounting in order to achieve extra cooling in the way of better airflow. AV spacers are made for this purpose.

Usage in home computers

Size 4-40 is used to receive jackscrews securing cable connectors to external computer ports, and size 6-32 is used for motherboard mounts.

Dell, Inc. refers to standoffs that receive thumbscrews as "hex nut screws" and measures them with the metric system.

See also

References

Spacers and standoffs are important types of fastener accessories. They are used to create clearance gaps between two or more joined surfaces or components. This is crucial in various assemblies, especially PCB installations and other electrical builds. Spacers also enable the precise positioning of screws or bolts in parts and materials.

This guide to screw or bolt spacers is designed to give all the basic information you will need when choosing and buying spacers for screws online.

By the end of the guide, you will be familiar with exactly what the definition of a spacer is, and the technical differences between them and standoffs.

You will also know which materials are widely available for various spacer applications in the UK, and which are the best spacers or standoffs to buy for your needs.

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