Quick Answer

Match the blade diameter to the machine: 115–125 mm for angle grinders, 180–230 mm for larger grinders, 300–350 mm for hand-held cut-off saws, 350–450 mm for tile/stone saws, and 500 mm and up for floor saws. Never fit a blade larger than the machine's maximum rating.

Key Size Ranges

Machine	Typical Blade Diameter	Best For
Small angle grinder	115–125 mm	Tile, thin stone, light cuts
Large angle grinder	180–230 mm	Stone, masonry, deeper cuts
Cut-off saw	300–350 mm	Concrete, brick, pipe
Tile / table saw	250–450 mm	Stone slabs, large tile
Floor / road saw	500–1200 mm	Deep concrete and asphalt cuts

How to Choose the Right Size

• Check the machine's maximum blade diameter and arbor size.
• Check the RPM rating — larger blades must run slower; smaller blades faster.
• Match the arbor hole (bore) to the spindle, using the correct reducer rings.
• Choose the largest diameter the machine accepts for the deepest cut.

How to Use It Correctly

• Never exceed the blade's maximum RPM at the machine's speed.
• Use the correct guards and flanges for the blade size.
• Do not use a blade on a machine not rated for its diameter.
• Inspect the blade for cracks or warping before mounting.

Frequently Asked Questions

Q: What is the max blade size for a 125 mm angle grinder?

A>Use a 125 mm blade — never larger. The guard, flange and RPM rating are matched to that size.

Q>Can I use a 230 mm blade on a 180 mm grinder?

A>No. The larger blade exceeds the machine's rating and guard, creating a serious safety risk.

Q: Does a bigger blade always cut deeper?

A>Yes, up to the machine's limit — larger diameter means a deeper cut, but speed and torque must still match.

Conclusion

Match diameter to the machine, keep RPM within rating, and use the right arbor. For silent, stable large-blade work, the Dekton Saw Blade (Silent Core) — JOY-DK-SC is a strong choice; the Marble Saw Blade (Straight Slot) — JOY-MS-ST suits smaller stone jobs.