4 Pk. High Lift Mower Blades 532138971 21" x 2-1/4" Fits AYP LTH1342 YTH1542XP

What It Is

This is a 4-pack of high-lift mower blades (OEM part #532138971) designed for 21-inch cutting decks. They are intended for AYP (American Yard Products) lawn tractors and zero-turn mowers, providing increased airflow for superior grass clipping discharge and bagging performance.

Fitment & Compatibility

Before buying, verify these specifics:

• Deck size: Only fits 21-inch decks. Measure your deck’s blade tip-to-tip distance.
• Model fit: Confirmed for AYP LTH1342 and YTH1542XP, but also fits many AYP/Craftsman, Husqvarna, and Poulan Pro models with a 21" deck. Check your mower’s manual or OEM part number.
• Dimensions: Blade is 21" long, 2-1/4" wide, with a 1" diameter center hole and a 5-point star drive. Measure your old blade’s length, width, and hole pattern.
• OEM vs aftermarket: These are aftermarket replacements for the OEM part #532138971. They meet or exceed OEM specs but are not factory-labeled.

Key Things to Know

• High-lift design creates strong suction for clean cuts and better bagging, but increases engine load and may wear faster on dusty/mulching-only mowers.
• Installation difficulty: Easy with basic tools (socket wrench, torque wrench). Use a blade removal tool to prevent spinning. Torque bolts to 70-90 ft-lbs.
• Common gotchas: High-lift blades can cause more vibration if the deck is not level or spindles are worn. Always sharpen blades after installation for best performance.
• Quality: Made from heat-treated steel with a durable coating. Expect 2-3 seasons of use under normal conditions.

Should You Buy It

Buy this 4-pack if you own a compatible AYP or Craftsman 21" deck tractor and prioritize bagging or side-discharge performance over mulching. It’s a solid value for the price, offering OEM-equivalent specs at a lower per-blade cost. Avoid if you only mulch or have a smaller 20" or larger 22" deck.