72531-VH7-000 72511-VH7-000 HRX Mulching Mower Blades Set Compatible with Honda HRX217 HRX217K1 HRX217K2 HRX217K3 HRX217K4 HRX217K5 HRX217K6 HRX537 21 Inch Deck, Upper and Lower Blade Kit, 2 Pack

What It Is

This is a genuine OEM-style two-blade mulching set (upper and lower blades) for Honda HRX mowers with a 21-inch deck. Designed to chop clippings into fine particles for lawn feeding, it replaces part numbers 72531-VH7-000 (upper) and 72511-VH7-000 (lower).

Fitment & Compatibility

• Deck size: Exactly 21 inches – measure your mower deck to confirm.
• Models: Fits Honda HRX217 (all variants: K1, K2, K3, K4, K5, K6) and HRX537. Not for HRX216 or older HRX models.
• OEM vs aftermarket: Listed as a “compatible” set, not genuine Honda parts. Verify blade thickness (stock is ~0.2”) and hole patterns match your spindles before installing.
• Measurement: Upper blade is shorter than lower blade; do not swap positions. Check that your mower has a two-blade system (some HRX models use a single blade).

Key Things to Know

• Installation: Requires removing the center bolt and blade adapter. Use a torque wrench to 35-40 ft-lbs. Reuse the original washer and spacer.
• Sharpness: Blades come sharp but may need light honing for optimal cutting. Dull blades cause tear-out and battery drain on electric-start models.
• Mulching vs bagging: This set is optimized for mulching. If you bag frequently, consider a dedicated bagging blade set.
• Balance: Always balance new blades before mounting to avoid vibration and spindle wear. Use a simple blade balancer tool.

Should You Buy It

If you own a Honda HRX217 or HRX537 and need a cost-effective direct replacement for worn mulching blades, this set is a solid pick. It’s not OEM, but at $28.99 it matches OEM specs for most users. Avoid if you require genuine Honda parts for warranty or professional use.