(2-Pack) Mower Mulch Blades - 42'' Fits John Deere L100 L110 L105 L108 L118 L111 GX20249

What It Is

This is a 2-pack of 42-inch mulching blades designed for select John Deere lawn tractors. They replace standard cutting blades to chop grass clippings finer and blow them back into the turf for natural fertilization, reducing bagging needs.

Fitment & Compatibility

Before buying, verify three things: deck size, model number, and blade dimensions. These blades fit 42-inch cutting decks only—not 38-inch or 48-inch decks. Compatible John Deere models include L100, L110, L105, L108, L118, L111, and others using OEM part GX20249. Measure your existing blade length (should be 21 inches end-to-end), center hole diameter (typically 1 inch), and spindle hole spacing. Cross-check your mower’s model number on the frame or under the seat. These are aftermarket blades, not OEM John Deere, so confirm they match your spindle mount (usually a 5-point star pattern). Avoid using on non-listed models or decks with different mounting designs.

Key Things to Know

• Quality: Aftermarket blades may be slightly thinner or less balanced than OEM. Check for warping or uneven edges before installation. User reviews average 4.5 stars, but some report shorter lifespan in heavy-use conditions.
• Installation: Moderate difficulty. You’ll need a socket wrench, a blade removal tool or block of wood to prevent spinning, and torque to 30-50 ft-lbs. Always disconnect the spark plug and wear gloves.
• Gotchas: Mulching blades require higher engine RPM to work effectively—don’t mow too slow or too fast. Wet grass clumps easily, so mow when dry. These will not work well with baggers or side-discharge unless you remove them.
• Maintenance: Sharpen every 10-15 hours of use. Replace if bent or cracked. The 2-pack gives you one spare.

Should You Buy It

If you own a compatible John Deere 42-inch deck tractor and want to mulch grass clippings instead of bagging or side-discharging, this is a cost-effective option. It’s best for residential lawns under 1 acre where fine mulching improves lawn health. For heavy-duty commercial use or if you prefer OEM fit and finish, consider genuine John Deere GX20249 blades instead.