ZALANA 21" Mulching Replacement Mower Blades - 2-Pack, 2105200317A Heat-Treated Steel for 20–21" Push Mowers

ZALANA’s 21-inch mulching blades (model 2105200317A) are replacement mower blades engineered to restore cutting performance and mulch clippings efficiently on compatible 20–21" push mowers.

If your walk-behind mower has lost its edge or no longer shreds grass evenly, swapping in a fresh pair of ZALANA 2105200317A blades brings back a cleaner cut and improved mulching flow. These two blades are heat-treated steel, sized to match factory dimensions, and designed for straightforward installation—so you can get back to yard work with fewer passes and less clumping.

Will these blades fit my mower model?

These ZALANA blades are made to replace OEM part numbers 2105200317A, 2105200317, and 84005221. They are compatible with a range of 20–21" push mowers from brands like Hyper Tough, Murray, and Black Max when the mower uses the same mounting oval center hole and blade profile.

• Compatible models: Hyper Tough MNA152701 (20"), Murray MNA152901 & MNA152903 (21"), Black Max MNA152905 (21")
• Center mounting: oval hole to match original blades
• Confirm fit: compare your old blade’s part number and mount style before purchase

How do these blades improve cut quality and mulching?

The blades are sharpened and heat-treated to maintain edge retention and resist premature wear. That sharper, more durable edge slices grass cleanly and helps distribute clippings through the deck for better mulching and faster breakdown, reducing visible clumps on the lawn.

• Heat-treated steel improves strength and longevity
• Precision grind keeps a consistent cutting angle
• Design promotes even circulation of clippings in the mower deck

What are the blade dimensions and package contents?

Each blade in this ZALANA two-pack matches typical 21" mower blade specs so you can replace both blades at once for balanced performance. Measurements and mounting details are provided so you can verify compatibility before installation.

• Length: 21 inches; Width: 2-1/4 inches; Thickness: 0.150 inches
• Center mounting: oval hole; package includes two 2105200317A blades
• Replaces OEM part numbers listed on product page

How do I install the replacement blades safely?

Installation is a simple process if you follow basic safety steps: disconnect spark ignition, remove the old blades, and mount the replacements with the correct orientation. Arrows stamped on the blade indicate rotation direction—match that to the old blade and torque hardware to the mower manufacturer’s specification.

• Step 1: Disconnect the spark plug to prevent accidental starts
• Step 2: Remove the blade bolt(s) and old blade(s); clean mounting area
• Step 3: Fit the new blade with arrow pointing in the direction of rotation and tighten securely

Who this is for: Homeowners and lawn-care enthusiasts with 20–21" push mowers who need a reliable, cost-effective blade replacement. Choose the ZALANA 2105200317A 2-pack when you want factory-compatible dimensions, improved edge life from heat-treated steel, and the convenience of swapping both blades for balanced cutting performance. Always verify your mower’s part number and mounting type before ordering.