Unthreaded Round Spacers are selected when an assembly calls for setting a fixed distance on a screw that passes straight through it, with no thread of its own. This application guide to the Trade series (plain bore spacer) type covers concrete end-uses, the specification checklist, correct installation, and where an alternative fastener performs better. Stocked across roughly 3.2 mm to 6.4 mm, they cover general to heavy-duty work.
Typical Applications for Unthreaded Round Spacers
The most common settings where these are specified:
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
- Electronics assembly: holding boards off a chassis and stacking multiple boards at a fixed pitch.
- Enclosures & panels: spacing a fascia, guard or label plate off the surface behind it.
- Machine alignment: setting and correcting the height of a component on its mounting.
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
How to Specify Unthreaded Round Spacers for Your Application
- Size: Select on bore diameter, and confirm it against the mating feature in the assembly. This product spans 3.2 mm–6.4 mm; check the full table below for the exact dimensions of each size.
- Material: Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This is a trade-series article rather than one covered by a published dimensional standard, so dimensions can differ between manufacturers. Quote the dimensions you need — or the part you are replacing — rather than a standard number.
Where Unthreaded Round Spacers Are Not the Right Choice
Match the fastener to the load, environment and whether the joint must be reopened; the wrong class or style is the usual cause of joint failure.
Custom manufacturing · Made to drawing
Need a unthreaded round spacers outside the standard range?
A non-standard standoff & spacer is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Made by tapping or turning.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
