Replacement 2105200317A 21" Mower Blades, Compatible with HyperTough Murray Blackmax MNA152701 MNA 152901 MNA 152903 MNA152905 Push Mower, Replace for 84005221 2105200317, 1 Pack

What It Is

This is a 21-inch replacement mower blade (part number 2105200317A) designed for HyperTough, Murray, and Blackmax push mowers. It’s a direct swap for worn or damaged OEM blades to restore clean cutting performance.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: Must be a 21-inch cutting deck. Measure your old blade’s length end-to-end (not the cutting path) to confirm 21 inches.
• Model numbers: Fits HyperTough MNA152701, MNA152901, MNA152903, MNA152905, plus Murray/Blackmax equivalents. Check your mower’s model tag (usually under the deck or on the frame).
• OEM parts: Replaces Murray 84005221 and 2105200317. Aftermarket, not OEM – center hole diameter and blade thickness should match your original. Measure the center hole (typically 1-inch or 7/8-inch) and the blade thickness (usually 0.125 to 0.150 inches) to avoid wobble or poor fit.

Key Things to Know

• Quality: 4.4 stars from 114 reviews suggests decent durability for home use. Expect mild steel – not as hard as premium brands (e.g., Oregon or Gator), but fine for occasional mowing.
• Installation: Simple swap with a socket wrench – remove the bolt, replace blade, torque to 40-50 ft-lbs. No special tools needed, but a blade balancer is recommended to check for vibration after install.
• Common gotchas: This is a single-pack (one blade), not a set. Some users note that the blade may require minor filing to fit if the center hole is slightly tight. Always lift the mower and disconnect the spark plug first.
• Sharpness: Comes pre-sharpened but not razor-sharp. Expect to sharpen after 10-15 hours of use for best results.

Should You Buy It

Yes, if you need a budget-friendly, drop-in replacement for a 21-inch HyperTough, Murray, or Blackmax push mower and don’t want to pay OEM prices. Skip it if you mow heavy grass or rocks often – a thicker, heat-treated blade will last longer and resist bending.