Quick Answer

Match the cup wheel diameter to your grinder's maximum wheel size and the arbor to its spindle thread: M14 for most European-style grinders, 5/8-11 for many US models, 22.23 mm for large grinders. Sizes run 100 mm to 180 mm - bigger cuts faster but is heavier to control.

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Size and Grinder Compatibility

• 4 inch/100 mm: small grinders, detail and edge work
• 5 inch/125 mm: the most common general-purpose size
• 6 inch/150 mm: larger grinders, more surface per pass
• 7 inch/180 mm: heavy stock removal, larger machines

Arbor Matching

• M14: common on European and Asian angle grinders
• 5/8-11 UNC: common on US models
• 22.23 mm: large grinders and many 180 mm machines
• 16 mm: some specific models

Check the spindle thread before ordering - an arbor adapter cannot fix a wrong thread.

Match the Wheel to the Job

• Levelling and heavy removal: 150-180 mm, coarse grit
• General grinding: 125 mm, medium grit
• Edge work and detail: 100-125 mm
• Finish passes: any size, fine grit

Frequently Asked Questions

Q: Can I put a 180mm wheel on a 125mm grinder?

A>No - never exceed the grinder's rated wheel size. The guard and speed rating will not be safe.

Q: What if my grinder takes M14 but the wheel is 22.23mm?

A>Use the wheel with the matching arbor or a proper adapter; never force a mismatched thread.

Q: Does bigger always cut faster?

A>Bigger wheels cover more surface but are heavier and slower to control; match size to the job and your grinder.

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Conclusion

Check the grinder's rated size and spindle thread, then choose the cup wheel that matches the job. The right fit is safe, fast and easy to control.