Why bore size matters, how to confirm arbor and flange fit, and what buyers should check before ordering 20mm, 22.23mm or 25.4mm diamond blades.
The bore is a machine-fit dimension
The center bore connects the blade to the machine spindle and flange system. It should be confirmed from the machine rather than selected only because a size is common in a market. A correct outside diameter with an incorrect bore can make the blade unusable or encourage unsafe adaptation.
Common bore sizes
20mm, 22.23mm and 25.4mm are frequently seen across small cutting tools, angle-grinder accessories and larger saw systems, but the correct choice depends on the exact machine. Some products use bushings or reducing rings when the blade and machine are designed for them; this should be confirmed before use.
Check the flange as well
The bore is not the only mounting dimension. Flange diameter, cleanliness, flatness and clamping condition influence blade stability. Dirt, burrs or uneven clamping can create run-out even when the nominal bore is correct.
When OEM artwork lists two bore sizes
Some printed samples show two bore options because the product can be produced or supplied in more than one configuration. The artwork used for a production order should match the actual product supplied. Buyers should not assume every blade physically includes both sizes.
Information to send
- Machine model
- Spindle/arbor size
- Existing blade bore
- Flange arrangement
- Blade diameter
- Material being cut
- Any reducing ring requirement