AB4200D Lawn Mower Blade, 21 Inch Mulch Lawn Mower Blade Set, Compatible with E GO Power+ ZT4204L 42" Z6 Zero Turn Riding Mower, 2 Pack

What It Is

This is a 21-inch mulching blade set (2-pack) designed for zero-turn riding mowers, specifically targeting the EGO Power+ ZT4204L 42" Z6 model. It’s intended to cut grass into fine clippings that decompose quickly, reducing the need for bagging.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: This blade is 21 inches long. It fits the EGO ZT4204L 42" deck (which uses two 21-inch blades). It will not fit standard 21-inch walk-behind mowers (those typically use 21-inch single blades with different center holes).
• Model number: Confirmed compatible with EGO ZT4204L only. Not for ZT4200L, ZT4202L, or other Z6 variants without checking deck specs.
• OEM vs aftermarket: This is an aftermarket replacement for EGO part #297000300R. The center hole diameter and blade thickness must match OEM specs—measure your existing blade’s center hole (likely 5/8” or 7/8”) and thickness (typically 0.2”–0.25”). If mismatched, the blade won’t seat properly or could vibrate.

Key Things to Know

• Quality concerns: With a 2.8 rating from only 2 reviews, reliability is unproven. Expect potential balance issues, softer steel, or poor coating compared to OEM blades.
• Installation difficulty: Easy—use a socket wrench to remove the center bolt. Torque to manufacturer spec (usually 70-90 ft-lbs). Always lift the deck and block securely; never work under a mower on a jack.
• Common gotchas: Mulching blades require sharp edges for fine clippings—dull blades tear grass. Check blade balance before installing (use a blade balancer). If the mower vibrates after installation, the blade is likely warped or unbalanced.
• Durability: Aftermarket blades often dull faster than OEM. Expect 10-20 hours of mowing before needing sharpening, depending on debris and grass type.

Should You Buy It

Only if you need a budget replacement for an EGO ZT4204L and are comfortable with potential quality trade-offs. If you mow frequently or on rough terrain, stick with OEM EGO blades (around $40–$50 per set) for proven durability and balance. For occasional use on a clean lawn, this 2-pack offers decent value—but check the center hole measurement and balance immediately upon arrival.