(2 Pack) Replacement Lawn Mower Mulching Blades for 134149 138498 138971 422719 532134149 - Fits Craftsman LT1000 LT2000 YT4000 Husqvarna YTH18542 YT150 Rider Lawn Tractor - 42" Deck

What It Is

This is a 2-pack of replacement mulching blades for 42-inch lawn tractor decks, designed for Craftsman LT1000, LT2000, YT4000 and Husqvarna YTH18542, YT150 riders. They replace OEM part numbers 134149, 138498, 138971, 422719, and 532134149.

Fitment & Compatibility

Before buying, confirm your deck measures exactly 42 inches (edge to edge). These blades fit only 42" stamped or fabricated decks with a center hole diameter of 1 inch and a 5-point star drive pattern. Double-check your current blade part number against the listed OEM numbers—they are not universal for all 42" decks. Verify your tractor model is in the supported list (Craftsman LT1000/LT2000/YT4000, Husqvarna YTH18542/YT150, or equivalent). Aftermarket blades may vary slightly in thickness or hole tolerance; measure your existing blade length and thickness to compare.

Key Things to Buy

• Quality: Made from hardened steel with a painted finish. Edge retention is adequate for typical residential use; not as durable as OEM or premium aftermarket blades under heavy or rocky conditions.
• Installation: Requires basic tools (socket wrench, torque wrench recommended). Torque blade bolts to 70-90 ft-lbs. Use thread locker if bolts are reused. Lift deck safely—block wheels and disconnect spark plug.
• Gotchas: Mulching blades have a higher lift profile than standard blades—expect reduced bagging performance and slightly higher engine load. Do not use for side discharge or bagging without switching blades.
• Balance: Aftermarket blades may be slightly off-balance out of the pack. Check balance on a blade balancer before installing to avoid vibration.

Should You Buy It

If you own a compatible 42" Craftsman or Husqvarna rider and primarily mulch leaves and grass clippings, this 2-pack at $24.99 is a solid value for the price. It’s not for heavy commercial use or if you need OEM fitment guarantees, but for typical residential mulching, it’s a reliable, budget-friendly choice.