72531-VH7-000 & 72511-VH7-000 Lawn Mower Blade Compatible with HRX217 HRX217K1 HRX217K2 HRX217K3 HRX217K4 Mower 21" MicroCut Twin Blade Set

What It Is

This is a two-piece MicroCut blade set (part numbers 72531-VH7-000 and 72511-VH7-000) designed for Honda HRX217 walk-behind mowers. It uses a smaller upper blade and a larger lower blade to create a vacuum-lift that mulches clippings finer than standard single blades.

Fitment & Compatibility

Before buying, verify your mower deck is exactly 21 inches and that your model is one of these: HRX217, HRX217K1, HRX217K2, HRX217K3, or HRX217K4. This set replaces OEM Honda parts 72531-VH7-000 (upper) and 72511-VH7-000 (lower). Measure your existing blades: the upper blade is roughly 10 inches long, the lower about 20 inches. Check that your mower uses the standard Honda center hole and oval drive pin pattern. This set will not fit HRX models with a different deck size (e.g., HRX217HYA or HRX217VKA may differ in blade design).

Key Things to Know

• Installation requires care: The upper and lower blades have different orientations. The upper blade’s curved tips must point upward toward the deck; the lower blade’s tips point downward. Installing reversed will cause poor cutting or vibration.
• Torque matters: Tighten the center bolt to 35-45 ft-lbs. Under-tightening can loosen the blade, over-tightening may strip the threads on the adapter.
• Check blade adapter condition: These blades mount to a splined adapter on the crankshaft. If the adapter is worn or damaged, the blades won’t seat properly and may wobble.
• Quality variance: At this price point, metal hardness may be lower than OEM Honda blades. Expect slightly shorter sharpness life (20-30% less) and possible edge chipping if you hit rocks or roots.

Should You Buy It

This set is a good budget alternative for Honda HRX217 owners who mulch regularly and want finer clippings without paying OEM prices. It’s not ideal if you bag or side-discharge often (the MicroCut design can clog in wet grass), and you’ll need basic mechanical comfort to install it correctly. If you hit debris frequently or want maximum durability, stick with OEM Honda blades.