Replacement 2105200317A 21" Mower Blades, Compatible with HyperTough Murray Blackmax MNA152701 MNA 152901 MNA 152903 MNA152905 Push Mower, Replace for 84005221 2105200317, 2 Pack

What It Is

This is a 2-pack of 21-inch replacement mower blades (part 2105200317A) designed for cutting grass on HyperTough, Murray, and Blackmax push mowers. It replaces OEM parts 84005221 and 2105200317.

Fitment & Compatibility

• Deck size: Only fits 21-inch cutting decks. Measure your deck width before buying.
• Brand/models: Compatible with HyperTough, Murray, and Blackmax push mowers including models MNA152701, MNA152901, MNA152903, and MNA152905.
• OEM cross-reference: Replaces genuine Murray/Blackmax part numbers 84005221 and 2105200317.
• Measurements: Check blade length (21 inches), center hole diameter (typically 1/2 inch), and blade thickness (usually 0.125-0.150 inches). Verify these match your current blade.
• Mounting: Standard 5-point star center hole pattern. Confirm your mower uses this design—some models use a different pattern.

Key Things to Know

• Quality: Aftermarket blade, not OEM. Sharpens well but may not hold an edge as long as genuine Murray blades. Good value for the price.
• Installation: Straightforward swap. Disconnect spark plug, remove the old blade bolt (left-hand thread on most push mowers), and replace. Torque bolt to 40-50 ft-lbs.
• Sharpening: Dull faster than premium blades. Expect to sharpen every 5-10 hours of use on typical grass. Resharpening is easy with a file or grinder.
• Balance: Always check blade balance after sharpening or installation. An unbalanced blade causes vibration and bearing wear.

Should You Buy It

Buy this if you own a compatible HyperTough, Murray, or Blackmax push mower and want an affordable replacement blade that works fine for regular home lawn care. Skip it if you need OEM durability for heavy use or thick, tough grass—consider a premium aftermarket or genuine Murray blade instead.