Quick Answer

Grinding problems are usually tooling or technique issues rather than defects in the concrete. Match the blade bore exactly to your saw spindle — common sizes are 20 mm, 22.23 mm (7/8"), 25.4 mm (1") and 30 mm. If the blade bore is larger than the spindle, use the correct hardened-steel bushing (reducer ring) that ships with the blade or is sold separately.

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Common Arbor Sizes

What you should know before starting.

Contractors who skip this stage usually end up redoing the floor.

A Practical Guide to Fit a Blade Correctly

The key points in practice.

• If bore > spindle: install the correct bushing first, then the blade.
• Read the bore size on the blade label or center stamp.
• Torque the flange nut to spec — under-tightening causes wobble.
• Read the spindle size on the saw spindle or manual.
• Spin the blade by hand to inspect it seats level on the flange.

This is where most crews get it right - or lose time.

When You Need an Adapter

A closer look at the details.

Our high-frequency welded blade ships with the common bore adapters, and the laser-welded range covers most floor saw spindle sizes.

Getting this part right saves a full re-pass later.

Safety Tips

What you should know before starting.

• Inspect the spindle for burrs before mounting system.
• Never run a blade with a loose bore — it can shatter.
• Replace bent or worn bushings.

Contractors who skip this stage usually end up redoing the floor.

Frequently Asked Questions

Q: Is it possible to use a 25.4 mm blade on a 20 mm arbor?

A: For most jobs, A>Yes, with the correct 25.4-to-20 mm bushing. Never run it without one.

Q: What exactly if my blade bore is smaller than the arbor?

A: In short, A>Do not force it or file it — return the blade for the correct bore size.

Q: Do I bushings affect balance?

A: The practical answer is, A>Quality hardened bushings are machined to tolerance and don't affect balance. Cheap cast washers do.

Q: How exactly do I know my saw's arbor size?

A: For most jobs, A>inspect the spindle with a ruler or the manual — most cut-off saws and grinders print it on the guard.

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Conclusion

Match the tooling to the concrete, keep the machine in good condition, and run even passes - the finish follows. A correctly fitted blade bore and bushing keep your saw safe and wobble-free.