21 Inch Ninja Mulching Mower Blades Fit for Snapper C21409R CP21409R C21509R CP21509R C21559BV Lawn Mower Replaces OEM Jonsered Snapper Murray Poulan Simplicity 7026407AYP

What It Is

This is a set of 21-inch “Ninja” mulching blades designed for specific Snapper rear-engine riders and similar lawn tractors. They replace OEM part 7026407AYP and are intended for machines with 21-inch cutting decks, focusing on fine mulching rather than bagging or side discharge.

Fitment & Compatibility

Before buying, confirm your mower deck measures exactly 21 inches (blade length). These blades fit Snapper models C21409R, CP21409R, C21509R, CP21509R, and C21559BV. They also cross-reference with Jonsered, Murray, Poulan, and Simplicity mowers using OEM 7026407AYP. Check your existing blade’s center hole diameter and offset – these are likely 5-point star or 5/8-inch round center hole with a 0.25-inch offset. Measure your blade’s thickness (typically 0.25 inches) and ensure the blade’s mounting pattern matches your spindle. If your mower uses a different center hole or offset, these won’t fit.

Key Things to Know

• Quality concerns: With only 1 review (1.0/5), be cautious. The “Ninja” design may wear faster or balance poorly compared to OEM blades. Inspect for warping or dull edges on arrival.
• Installation: Standard – lift mower, remove blade bolt (left-hand thread on some models), and torque to manufacturer spec (usually 70-90 ft-lbs). Use a blade balancer after installation.
• Mulching vs. bagging: These are dedicated mulching blades with a curved “wing” design. They won’t work well for bagging or side discharge – expect clumping if grass is wet or tall.
• Part number mismatch: Some listings may incorrectly claim fit for models not listed. Always verify your mower’s OEM blade part number (check under deck or in manual) before purchasing.

Should You Buy It

Only buy if you’re confident in the fitment (deck size and mounting pattern match exactly) and you primarily mulch grass with a Snapper or compatible tractor. Given the single poor review, consider OEM Snapper blades (part 7026407AYP) for guaranteed quality and balance – the small price difference is worth avoiding vibration or premature wear.