138971 42 inch Toothed Mulching Mower Blades Compatible with Craftsman T110 LT1000 LT2000 Husqvarna LT125 LTH130 YTH1842 YTH20F42T Replaces 138498 127843 532138971 532138498 532127843, 2 Pack

What It Is

This is a 42-inch toothed mulching blade set (2-pack) designed for select Craftsman and Husqvarna lawn tractors. It replaces OEM part numbers 138498, 127843, 532138971, 532138498, and 532127843, and is intended for use with 42-inch cutting decks.

Fitment & Compatibility

Before buying, verify the following:

• Deck size: Only fits 42-inch decks. Measure your deck width—do not assume based on tractor model alone.
• Tractor models: Compatible with Craftsman T110, LT1000, LT2000; Husqvarna LT125, LTH130, YTH1842, YTH20F42T. This is not a universal blade—check your owner’s manual or existing blade part number.
• OEM vs aftermarket: This is an aftermarket replacement. It matches OEM dimensions but may differ slightly in material thickness or balance. Confirm the blade length, center hole size (typically 1-inch), and offset before installing.
• Measurement: Blade length should be exactly 21 inches each (for a 42-inch set). Measure your current blade from tip to tip.

Key Things to Know

• Installation difficulty: Moderate. You’ll need a socket wrench and a blade removal tool or block of wood to prevent spinning. Torque bolts to 70–90 ft-lbs. Use thread locker if bolts are loose.
• Mulching vs bagging: These are mulching blades, not high-lift blades. They chop clippings finer for grass recycling but may not discharge well for bagging. If you bag often, consider a dedicated bagging blade.
• Quality: Budget-friendly, but reviews note occasional balance issues. Check balance with a blade balancer before installation—unbalanced blades cause vibration and deck damage.
• Sharpness: Blades come unsharpened. You’ll need to file or grind the cutting edge before first use for best performance.

Should You Buy It

Buy this set if you have a 42-inch Craftsman or Husqvarna tractor, primarily mulching, and want a cost-effective replacement for worn OEM blades. Avoid if you need bagging performance or prefer premium, pre-balanced blades. Check your deck size and model number first—fitment is not guaranteed for all 42-inch decks.