Best Round Shims AI pick
Chosen by an AI model from its trained knowledge, with its reasoning.
AI pick (brand): Artus
Artus is a dedicated shim manufacturer offering round shims in standard metals with controlled thickness, rather than generic stamped washers.
Not for: Buyers who only need a cheap assorted kit of washers for non-critical spacing.
What the AI looks for in Round Shims
- ID/OD fit
- The inner diameter must clear the shaft or bolt with minimal play, and the outer diameter must stay inside the bearing seat or housing shoulder. An oversized ID lets the shim shift off-center, and an oversized OD can rub on rotating parts.
- Shim ring standard
- For metric shaft and bearing work, look for DIN 988 shim rings in the matching shaft size. Standard dimensions mean the shim fits the bearing seats and snap-ring grooves it was designed for.
- Burr-free edges
- Edges should be flat and free of burrs from stamping. A burr adds thickness and stops the shim from seating flat.
- Material and hardness
- Use hardened spring steel or stainless for axial bearing preload. Brass is fine for light spacing. Soft shims deform under axial load and preload is lost.
Brands that matter
- Artus: Shim specialist with round and custom shapes.
- Precision Brand: Shim stock you can cut round shims from in a pinch.
What to avoid
- Generic flat washers used as precision shims, since their thickness tolerance is loose.
- Kits that do not list ID, OD and thickness for each size.
Questions
Is a round shim the same as a flat washer?
No. A shim is made to a controlled thickness for setting position or preload. A washer only spreads load, and its thickness varies much more.