palart (2 Pack) 134149 138498 138971 422719 532134149 Replacement Lawn Mower Mulching Blades Compatible with Craftsman LT1000 LT2000 YT4000 Husqvarn YTH18542 YT150 Rider Lawn Tractor - 42" Deck

What It Is

This is a 2-pack of mulching blades designed for 42-inch cutting decks on select Craftsman and Husqvarna lawn tractors. Mulching blades have a more curved shape and higher lift than standard blades, cutting grass into finer clippings that decompose faster and return nutrients to the lawn.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: These blades are specifically for 42-inch decks. Measure your deck if unsure.
• OEM part numbers: The pack replaces Craftsman/Husqvarna OEM numbers 134149, 138498, 138971, 422719, and 532134149. Cross-reference your current blade’s part number.
• Tractor models: Fits Craftsman LT1000, LT2000, YT4000 series and Husqvarna YTH18542, YT150, and similar riders with a 42" stamped deck. Not compatible with zero-turn mowers or 46"/54" decks.
• Blade measurements: Each blade is approximately 21 inches long, 2 inches wide, with a 1-inch center hole and 7-point star drive pattern. Measure your old blade’s length, width, and hole pattern to confirm.

Key Things to Know

• Installation difficulty: Easy to moderate. Requires a 15/16" or 5/8" socket (depending on your deck), a torque wrench (recommended 70-90 ft-lbs), and safety glasses. Consider using a blade removal tool or block of wood to prevent spinning.
• Mulching vs. bagging: These are designed for mulching only. If you bag or side-discharge, you’ll need different blades.
• Balance check: After sharpening or replacing, always balance the blade. An unbalanced blade causes vibration, cuts poorly, and damages the spindle.
• Quality note: These are aftermarket blades—generally good value, but may be slightly thinner or less durable than OEM. Fine for residential use, but commercial operators should stick with OEM.

Should You Buy It

If you own a Craftsman or Husqvarna rider with a 42-inch deck and want to mulch your clippings instead of bagging, this is a solid, affordable option. The 2-pack gives you a spare or lets you replace both spindles at once. Just double-check your deck size and blade pattern before ordering—it’s the most common mistake. For light-to-moderate residential mowing, these will perform well.