How to find the right Spacers & Standoffs AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Spacers & Standoffs
- Threaded or unthreaded
- Standoffs are internally and/or externally threaded and hold parts on their own. Spacers are plain sleeves that need a screw passing through them. Choosing the wrong type means either missing threads or a part with nothing to clamp it.
- Thread or bolt size
- Match the exact thread: M2.5 for Raspberry Pi-class boards, M3 for most hobby and metric PCBs, and #4-40 or #6-32 for US electronics and PC cases. For spacers, the inner diameter must clear the bolt. Metric and UNC sizes that look close, such as M3 and #4-40, do not interchange.
- Length definition
- Body length is measured from shoulder to shoulder and excludes any male thread. Board-to-board or board-to-chassis gap is set by body length, so including the stud gives the wrong height.
- Material vs conductivity
- Use nickel-plated brass, steel or aluminum where you want a ground path or need strength. Use nylon where you need electrical insulation or only light loads. A metal standoff can short a trace near a mounting hole, and nylon strips or creeps under high torque.
- Load and environment
- Use stainless for moisture or outdoor use, and metal over nylon for vibration or heat. Zinc-plated steel corrodes, and nylon softens at elevated temperatures.
Brands that matter
- Keystone Electronics: Broad catalog of threaded standoffs and unthreaded spacers in brass, aluminum, steel and nylon.
- RAF Electronic Hardware: US maker of standoffs and spacers in inch and metric sizes.
- Harwin: PCB standoffs and spacers, including surface-mount types.
- Essentra Components: Nylon PCB supports, spacers and standoffs (absorbed the Richco line).
- PennEngineering (PEM): Self-clinching standoffs that press into sheet metal.
- Würth Elektronik: Metric PCB standoffs and spacers with published dimensions.
- Bivar: Nylon spacers and LED mounting spacers.
What to avoid
- Kits that list thread size without pitch or standard, so you cannot tell M3 from #4-40.
- Listings that do not say whether the length includes the male stud.
- Nylon standoffs in high-torque, hot or vibrating mounts.
- Bare or zinc-plated steel in damp locations.
Questions
What is the difference between a spacer and a standoff?
A standoff has threads and fastens parts at a fixed distance. A spacer is an unthreaded sleeve that only sets the distance, while a separate screw does the clamping.