7026407AYP Lawn Mower Mulching Blade for 21" Deck, Compatible with S-Napper Nin-ja C21409R C21509R CP21409R CP21509R C21559BV Walke Behind Mower, 1 Pack

What It Is

This is a 21-inch mulching blade (part #7026407AYP) designed to finely chop grass clippings and return them to the lawn as natural fertilizer. It’s intended for walk-behind mowers, specifically the S-Napper Nin-ja models listed.

Fitment & Compatibility

Before buying, confirm your mower has a 21-inch cutting deck—this blade won’t fit 20” or 22” decks. It’s compatible with S-Napper Nin-ja models: C21409R, C21509R, CP21409R, CP21509R, and C21559BV. Measure your existing blade’s center hole diameter (typically 7/8” or 1”) and overall length (exactly 21”). If your mower uses a different center hole size or offset pattern, this won’t mount. This is an aftermarket replacement; check that your OEM part number matches 7026407AYP.

Key Things to Know

• Quality: 4.8/5 stars from 25 reviews suggests consistent sharpness and durability for residential use.
• Installation difficulty: Easy—requires a socket wrench to remove the blade bolt. Always disconnect the spark plug first.
• Common gotcha: Mulching blades have a curved or angled design for lift. Install with the cutting edge facing the direction of rotation (usually marked “up” or with an arrow). Wrong orientation reduces cut quality and can damage the blade.
• Single pack: You get one blade; if your mower uses two (rare on 21” walk-behinds), you’ll need a second.

Should You Buy It

Yes, if you own one of the listed S-Napper Nin-ja models with a 21” deck and want a dedicated mulching blade for better lawn health. The high rating and specific fitment make it a safe, effective upgrade over a standard bagging or side-discharge blade. Avoid if your mower isn’t on the compatibility list or you need a different blade type.