72531-VH7-000 & 72511-VH7-000 Lawn Mower Blade Compatible with 21 inch Deck Hon da HRX217 HRX537 HRX537C HRR216PKU HRR216VYU HRX217K1 HRX217K2 HRX217K3 HRX217K4 MicroCut Twin Blade Set

What It Is

This is a two-blade MicroCut twin blade set (part numbers 72531-VH7-000 and 72511-VH7-000) designed for 21-inch deck Honda HRX217, HRX537, HRX537C, HRR216PKU, HRR216VYU, and HRX217K1-K4 mowers. It replaces the OEM Honda twin-blade system for finer grass clipping and improved mulching.

Fitment & Compatibility

• Deck size: Only for 21-inch cutting decks. Measure your deck width to confirm.
• Model match: Fits Honda HRX217 (all K1-K4 variants), HRX537, HRX537C, HRR216PKU, HRR216VYU. Check your mower’s model number on the deck or under the seat.
• OEM vs aftermarket: This is a direct replacement for Honda OEM twin blades. No adapter or modification needed.
• Measurements: Each blade is approximately 21 inches long, with a center hole diameter of 1 inch. Confirm your spindle bolt size (typically 5/16″ or 3/8″) before installing.

Key Things to Know

• Installation difficulty: Moderate. You’ll need a socket wrench and a blade removal tool (or a block of wood to prevent spinning). Always disconnect the spark plug first.
• Blade orientation: The MicroCut system requires both blades installed in the correct position—one on top, one on bottom—with the cutting edges facing opposite directions. Mark them before removal.
• Quality note: Aftermarket blades can vary in hardness. This set is rated well (4.8 stars from 16 reviews) but check for balanced weight and sharpness out of the box.
• Common gotcha: The twin-blade design increases lift and mulching, but it can clog in wet or tall grass. Keep the deck clean and sharpen every 25 hours of use.

Should You Buy It

If you own a compatible Honda 21-inch mower and want an affordable, direct replacement for the OEM twin-blade system, this set is a solid choice. It’s well-reviewed and priced lower than dealer parts, but verify your deck size and bolt pattern first. Best for homeowners who mulch regularly and want finer clippings.