UDC Parts 532134149 Mulching Blades Replacement for Craftsman 42 Inch 422719 134149 Husqvarna YTH18542 YTA18542 YTH1842 138971 532138971 138498 Poulan PO17542LT YTH1542XP LT1000 LT2000 / 2 Pack

What It Is

This is a two-pack of aftermarket mulching blades designed to replace OEM blades on select 42-inch Craftsman, Husqvarna, and Poulan lawn tractors. Mulching blades have a curved, high-lift design that recirculates clippings for fine shredding, ideal for returning nutrients to the lawn rather than bagging or side-discharging.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Must be a 42-inch cutting deck. Measure center spindle to center spindle if unsure.
• Model numbers: Confirmed fit for Craftsman 422719, Husqvarna YTH18542, YTA18542, YTH1842, Poulan PO17542LT, YTH1542XP, LT1000, LT2000. Also replaces OEM parts 134149, 138971, 532138971, 138498.
• Blade dimensions: Each blade measures 20.5 inches long, 2.5 inches wide, with a 1-inch center hole and 0.5-inch star-shaped drive. Measure your old blade’s length, width, center hole, and drive pattern—these specs must match exactly.

Note: This is an aftermarket blade, not OEM Craftsman/Husqvarna. It will work on many other 42-inch tractors with the same spindle pattern (e.g., some AYP, Murray, Sears), but always cross-reference your model number with the listed OEM numbers.

Key Things to Know

• Quality: Made from heat-treated steel with a protective coating. Users report good durability for residential use, but may dull faster than OEM blades on heavy-duty or rocky lawns.
• Installation difficulty: Straightforward—remove the old blade with a socket wrench, install new blade with the lift edge facing upward toward the deck. Torque the bolt to 70-80 ft-lbs. Use thread locker to prevent loosening.
• Common gotcha: These are mulching blades, not high-lift bagging blades. If you want to bag clippings, you’ll need a different blade. Also, mulching works best when grass is dry and not too tall—cut no more than 1/3 of the blade length at a time.
• Balance: Some users report needing to balance the blades before installation (use a simple blade balancer). Unbalanced blades cause vibration and wear spindle bearings.

Should You Buy It

If you own a 42-inch Craftsman, Husqvarna, or Poulan tractor with a standard spindle and want an affordable, well-reviewed mulching blade for regular residential mowing, this is a solid choice. Avoid if you need bagging performance or have heavy commercial use—consider OEM blades for longer edge life.