Direct Answer: Choosing the correct diamond blade diameter depends on your saw horsepower, arbor shaft size, and required depth of cut: 4.5" to 7" blades fit angle grinders (1.5"ā2.25" cut depth); 12" to 14" blades fit handheld cut-off saws and 13HP floor saws (4"ā4.6" cut depth); 18" to 24" blades fit 20HPā35HP floor saws (6.5"ā9.5" cut depth); and 30" to 36" blades fit heavy-duty 50HP+ street saws (12"ā15" cut depth).
| Blade Diameter | Common Power Tool | Max Cut Depth | Standard Arbor Size |
|---|---|---|---|
| 4.5 Inches | Small Angle Grinder | 1.25 Inches | 7/8" - 5/8" Bushing |
| 14 Inches | Gas Cut-Off Saw / 13HP Floor Saw | 4.625 Inches | 1" / 20mm (Stihl) |
| 20 Inches | 35HP Floor Saw | 7.625 Inches | 1" with Drive Pin Hole |
A 14-inch diamond blade on a handheld cut-off saw or walk-behind saw provides a maximum cut depth of 4.6 inches.