2105200317A Mower Blades for 21" Deck, Compatible with M-urray Daye H-yper Tough Black-Max MNA152701 MNA152901 MNA152903 Lawn Mower, Replaces 84005221, 2105200317, 2 Pack

What It Is

This is a 2-pack of 21-inch replacement mower blades designed for standard residential push mowers. They match the OEM specs for M-urray, Daye, H-yper Tough, and Black-Max models, making them a direct swap for worn or damaged blades.

Fitment & Compatibility

Before buying, confirm these three things:

1. Deck size: Only for 21-inch cutting decks. Measure your blade length (end to end) – it must be exactly 21 inches.
2. Model match: Fits MNA152701, MNA152901, MNA152903. Also compatible with M-urray, Daye, H-yper Tough, and Black-Max mowers using OEM part numbers 84005221 or 2105200317.
3. Center hole & offset: These blades use a standard 1-inch center hole and a 0.75-inch offset (bent near the center). Measure your old blade’s hole diameter and offset height to confirm.

If your mower isn’t listed, compare blade length, hole size, and offset visually. Aftermarket blades may require minor grinding to balance perfectly.

Key Things to Know

• Quality: Rated 4.6/5 – users report they’re sharp out of the box and hold an edge well for residential use. Not for heavy commercial cutting.
• Installation: Easy if you have a socket wrench and block the blade to prevent spinning. Torque bolts to 30-40 ft-lbs. Install with the lift wing facing up toward the deck.
• Common gotchas: Check blade balance before mounting (hang on a nail). Unbalanced blades cause vibration and deck damage. Also, verify that the center hole is exactly 1 inch – some older M-urray decks use a 5/8-inch hole.
• Pack includes: 2 blades only. No hardware (bolts/washers) – re-use your old ones if in good shape, or buy new fasteners separately.

Should You Buy It

If you have one of the listed mower models and need a quick, affordable replacement for a dull or bent blade, this 2-pack is a solid value. It’s not for commercial mowers or decks larger than 21 inches, but for standard residential cutting, the quality and price are right.