Precision Round Shims (DIN 988) are specified where the joint requires the mechanical function defined by its drawing and dimensional table. The sections below cover the typical end-uses by industry, the size and material decisions for each, assembly practice, and the applications this fastener type is not suited to. Stocked across roughly 3 mm to 20 mm, they cover general to heavy-duty work.
Typical Applications for Precision Round Shims
The most common settings where these are specified:
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
- Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
How to Specify Precision Round Shims for Your Application
- Size: Select on bore diameter, and confirm it against the mating feature in the assembly. This product spans 3 mm–20 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 product is supplied to DIN 988. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Where Precision Round Shims 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.
