SporGain Lawn Mower Blade Sharpener, 15°–45° Adjustable Lawnmower Blade Sharpener, Fits 1.65"–3.60" Mower Blades, Use with Angle Grinder, Precision Lawn Mower Blade Sharpening Tool

What It Is

This is a guided sharpening jig that clamps onto a mower blade and uses an angle grinder to restore a consistent cutting edge. It’s designed for homeowners or semi-pros who sharpen blades manually, fitting most walk-behind, zero-turn, and riding mower blades.

Fitment & Compatibility

• Blade width: Fits blades 1.65" to 3.60" wide (measured across the flat, non-curved section).
• Blade thickness: Works with standard 0.10"–0.25" thick blades.
• Grinder arbor: Requires a standard 4.5" or 5" angle grinder with a 5/8"-11 threaded spindle.
• Not for: Curved, serrated, or mulching blades with complex profiles—only flat or slightly curved blades.
• Check before buying: Measure your blade’s width at its widest flat point. If it’s narrower than 1.65" or wider than 3.60", this won’t clamp securely.

Key Things to Know

• Quality: Solid aluminum construction with a steel guide—holds up to repeated use, but the plastic adjustment knob can crack if overtightened.
• Installation difficulty: Easy (5 minutes). Clamp onto blade, set angle (15°–45°), run grinder along guide. No drilling or permanent modification.
• Common gotchas:
  • You must remove the blade from the mower first—cannot sharpen on the deck.
  • The guide leaves a slight burr on the back edge; remove it with a light pass or file.
  • Over-sharpening (beyond factory bevel) reduces blade life; stick to 30°–35° for most residential blades.

Should You Buy It

If you sharpen multiple blades per season and want repeatable, even edges without freehanding, this jig is worth it. Skip it if you only sharpen once a year, have narrow or curved blades, or prefer a bench grinder—that’s faster for occasional use.