138971 42 Inch Mower Blades for Craftsman T110 LT1000 LT2000 YS4500 YT3000 42'' Deck Zero-Turn Mowers Husqvarna Poulan Pro 127843 138498 139775 532139775 532138971 532127843 134149 3-IN-1 2 PCS

What It Is

This is a set of two replacement 3-in-1 mower blades (mulch, bag, side-discharge) designed for 42-inch cutting decks on Craftsman T110, LT1000, LT2000, YS4500, YT3000, and select Husqvarna/Poulan Pro zero-turn mowers. They fit decks requiring a 20.5-inch blade length with a 1-inch center hole and 5-point star drive.

Fitment & Compatibility

Before buying, confirm your deck measures exactly 42 inches cutting width. These blades are 20.5 inches long, 2.5 inches wide, with a 1-inch center hole and 5-point star (5/8-inch) drive. They replace OEM part numbers 138971, 127843, 138498, 139775, 532138971, 532127843, and 134149. Not compatible with 46-inch or 54-inch decks, or models using a different center hole shape (e.g., oval or 7-point star). Double-check your model number on the mower frame or deck for exact fit.

Key Things to Know

• Quality: Made from heat-treated carbon steel with a protective coating; sharp out of the box but benefit from a quick touch-up on a bench grinder for optimal cut.
• Installation: Moderate difficulty – requires a socket wrench (usually 15/16-inch) and a blade removal tool or block of wood to prevent spinning. Torque to 70-80 ft-lbs.
• Common gotchas: The star drive must align perfectly with the deck spindle; if your spindle uses a different pattern (e.g., 7-point), these won’t fit. Also, these blades are slightly heavier than OEM, so balance-check after installation to avoid vibration.
• Maintenance: Replace after 25 hours of use or when the cutting edge is dull/nicks appear – sharpening more than twice reduces balance.

Should You Buy It

If you own a 42-inch Craftsman T110, LT1000, or similar Husqvarna/Poulan Pro model and want a cost-effective replacement that handles mulching, bagging, and side-discharge equally well, this is a solid choice. It’s a direct fit for the listed OEM numbers and offers good durability for residential use. Skip it if your deck uses a non-standard drive pattern or you need ultra-light blades for high-speed commercial mowing.