2105300125A Lawn Mower Blade Replacement for Murray,Daye & Hyper Tough MNA152701,MNA152505 Push Mower, 20" Lawn Dethatcher Blade Replacement Parts Number 212-9903,355-101

What It Is

This is a 20-inch replacement blade designed for dethatching (not standard mulching or bagging) on select Murray, Daye, and Hyper Tough push mowers. It lifts and cuts through thatch buildup while leaving grass intact, making it a specialized seasonal tool rather than an everyday cutting blade.

Fitment & Compatibility

Check before buying:

• Deck size: Must be a 20-inch cutting deck. Measure your deck width—this blade will not fit 21” or 22” mowers.
• Model match: Verified for Murray MNA152701 and MNA152505, plus Daye and Hyper Tough push mowers with the same deck. Cross-references OEM part numbers 212-9903 and 355-101.
• Center hole: 7/8-inch round (common for Murray). If your spindle uses a star or oval hole, it won’t fit.
• Blade type: This is a dethatcher blade—flat with raised tines, not a standard straight or mulching blade. Confirm your mower accepts dethatcher blades (some decks require a specific blade adapter).

Pro tip: Remove your current blade and measure center hole diameter and overall length (20”) before ordering. If your mower uses a different spindle bolt size (usually 5/16” or 3/8”), double-check the bolt fits the 7/8” hole.

Key Things to Know

• Not for regular mowing: This blade aggressively combs and cuts thatch, but will scalp or damage healthy grass if used for routine cutting. Only use in spring/fall when thatch is thick.
• Installation is straightforward with a socket wrench and blade stopper. Torque to 35-40 ft-lbs. No special tools needed, but a blade balancer helps avoid vibration.
• Check blade adapter: Many Murray decks use a plastic adapter plate under the blade. If yours is worn or missing, the blade won’t sit flat—replace it (part # 212-9904).
• Sharpening is difficult: Dethatcher tines are thin and brittle. Replace the blade every 1-2 seasons instead of sharpening; it’s cheaper than a damaged deck.

Should You Buy It

Buy this if you have a 20” Murray/Daye/Hyper Tough push mower with a thatch problem and you’re already comfortable swapping blades. Skip it if you need a standard cutting blade or your deck uses a star-shaped spindle hole—this is a niche dethatcher, not an all-purpose replacement. At $23 with strong reviews, it’s a solid value for seasonal thatch control.