How to find the right Notched Shims AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Notched Shims
- Notch width vs fastener
- Notch or slot width should clear the bolt or anchor shank with a little side play; choose the next notch size up rather than enlarging a notch in the field. A shim that binds on the bolt will not seat flat, and opening the notch with a grinder leaves burrs that throw off the stack height.
- Footprint vs mounting pad
- The outer dimensions should cover the full bearing area of the machine foot or base without overhanging it significantly. An undersized shim concentrates load and can crush or walk out. An oversized one interferes with adjacent features.
- Material for the environment
- Use stainless steel (302/304 type) for outdoor, washdown or corrosive settings. Use carbon steel or brass only indoors and dry. Use plastic or composite only for light-load construction leveling, not machinery alignment. Rusting steel shims swell and flake, which changes alignment over time. Plastic creeps under sustained heavy load.
- Thickness accuracy and marking
- Each shim should be stamped or etched with its thickness. For alignment work, check the stated thickness tolerance and confirm flatness and burr-free edges. Stacking unmarked or burred shims makes laser or dial-indicator alignment a guessing game.
- Assortment vs single size
- Buy graduated kits covering several thicknesses in one footprint for alignment jobs. Buy bulk packs of a single thickness for repetitive installs. Alignment needs fine increments on hand. Production installs need consistency and quantity.
- Stack height
- Keep stacks to a few shims; replace thin multiples with one thicker shim where possible. Every interface adds soft-foot springiness and potential error.
Brands that matter
- Maudlin Products: Widely used precut stainless shim kits and single sizes for pump and motor alignment.
- Artus: Long-established maker of precision shims and shim stock in steel, brass and plastic.
- Precision Brand: Known for shim stock and precut shim assortments in multiple materials.
- Nelson Wood Shims: Composite and wood construction shims for door, window and cabinet leveling, not machinery.
What to avoid
- Unmarked shims with no stated thickness or material grade.
- Plastic or composite shims under motors, pumps or other heavy vibrating equipment.
- Carbon steel shims in outdoor or washdown locations.
- Shims with burrs or bent edges along the notch.
Questions
What is the difference between notched and slotted shims?
The terms often overlap. Both have an opening so the shim can slide in around a bolt without removing it. Check the drawing for the opening's width, depth and shape rather than relying on the name.
Can I cut my own notched shims from shim stock?
Yes, for one-off jobs. Deburr carefully and mark the thickness. For repeated alignment work, precut kits are flatter and faster.