42 inch Deck Lawn Mower Blades,138971 Mulching Blades with 5 Point Star, Compatible with LT1000 LT2000 T110 YT3000, Repalce for 138971, 134149, 138498, 532138971

What It Is

This is a set of three 42-inch mulching blades designed to replace OEM part 138971 (and cross-reference 134149, 138498, 532138971) on select riding lawn mowers. They use a 5-point star center hole and are aimed at cutting grass into fine clippings for nutrient recycling, not side-discharge or bagging.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: Your mower must have a 42-inch cutting deck—measure if unsure.
• Center hole: The 5-point star pattern fits specific spindles on models like LT1000, LT2000, T110, and YT3000. If your mower uses a different hole shape (round, oval, or keyed), these won’t work.
• OEM cross-reference: Confirmed compatible with 138971, 134149, 138498, and 532138971. Check your owner’s manual or current blade part number. These are aftermarket, not OEM, so dimensions may vary slightly—measure blade length, width, and thickness against your old blade if possible.

Key Things to Know

• Mulching only: These blades have a curved, closed design that recirculates clippings. They’re not meant for bagging or side discharge; performance suffers if used with open chutes.
• Installation: Moderate difficulty—requires a socket wrench and blade removal tool (or a block of wood to prevent spinning). Torque to manufacturer specs (typically 70-90 ft-lbs). The 5-point star must align perfectly; don’t force it.
• Sharpness out of box: Most users report they’re sharp enough for a season, but check for burrs on the cutting edge. Lightly file if needed.
• Balancing: Aftermarket blades can be slightly off-balance. Use a blade balancer before installing to avoid vibration and spindle wear.

Should You Buy It

If you own a 42-inch riding mower with a 5-point star spindle (like a Craftsman LT1000 or John Deere T110) and want an affordable mulching upgrade, these are a solid choice—especially for fine clippings in dry grass. Skip them if you need bagging or side-discharge blades, or if your deck uses a different center hole pattern.