Honda 72531-VA3-810 Blade Upper Mulch

What It Is

The Honda 72531-VA3-810 is a genuine OEM upper mulch blade designed for select Honda HRC and HRS commercial mower decks. It sits above the lower cutting blade in a two-blade mulching system to recut clippings for finer dispersion.

Fitment & Compatibility

• Deck size: Fits 21-inch Honda commercial walk-behind mowers (HRC216, HRS216 series).
• Measure your existing blade: Overall length must be 21 inches, center hole diameter 1 inch, and the blade’s “upper” mounting orientation—this is not a standard lower blade.
• Check model number: Confirm your mower uses a twin-blade mulching kit. Common compatible models: HRC216K1, HRC216K2, HRS216K1, HRS216K2.
• OEM only: Aftermarket versions of this specific upper mulch blade are rare; Honda’s part number is unique. Cross-reference with your owner’s manual or existing blade’s stamped number.

Key Things to Know

• Quality: Genuine Honda steel with balanced, heat-treated edge—holds sharpness well in grass/light debris.
• Installation: Requires removing the lower blade first; torque to 30–35 ft-lbs (check your manual). Use a blade stop tool or wedge to prevent rotation.
• Gotcha: This blade only works in mowers with the factory mulch kit installed. If your deck lacks the upper blade mounting bracket, it won’t fit.
• Wear: Replace when edge is rounded or nicked—dull blades tear grass, leading to browning. Inspect every 25 hours of use.

Should You Buy It

If you own a Honda HRC or HRS 21-inch commercial mower and want OEM-grade mulching performance with minimal clumping, this blade is the correct replacement. It’s not for standard single-blade decks or non-Honda mowers. For $19, it’s a reliable, exact-fit part that avoids guesswork.