4PK Oregon 42" Lawn Mower Blades Replacement for Sears Craftsman Poulan AYP Ariens 127843, 138498, 138971, 532127843, 532138498, 532138971 High Lift Blades

What It Is

This is a 4-pack of Oregon 42-inch high-lift lawn mower blades designed to replace blades on select Sears Craftsman, Poulan, AYP, and Ariens mowers. High-lift blades create stronger airflow for improved grass clipping discharge and bagging performance, making them ideal for taller or wetter grass.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch cutting deck and uses blades with a 1-inch center hole, a 0.25-inch thickness, and a 3.5-inch offset. These blades replace OEM part numbers 127843, 138498, 138971, 532127843, 532138498, and 532138971. They fit many Craftsman, Poulan (Pro, Husqvarna), AYP, and Ariens 42-inch decks from the 1990s and 2000s. Measure your existing blade length (42 inches across both tips) and compare mounting hole pattern—these require a 5-point star or 5/8-inch center hole with two offset mounting holes. Not compatible with 46-inch or 54-inch decks, or zero-turn mowers with different spindle patterns.

Key Things to Know

• Quality: Oregon is a reputable aftermarket brand; these are heat-treated for durability but may not last as long as OEM blades in abrasive conditions.
• Installation difficulty: Moderate. You’ll need a socket wrench, blade removal tool, and possibly a torque wrench (recommended 70-90 ft-lbs). Watch for sharp edges—wear gloves.
• Common gotchas: The high-lift design increases engine load and can cause belt wear on older mowers. Ensure your mower has enough horsepower (typically 15+ HP) to handle them. Also, these blades may not fit decks with a center bolt that requires a 5/8-inch hex hole—check your spindle.
• Balance: They come pre-balanced, but after sharpening, you’ll need to re-balance them to avoid vibration.

Should You Buy It

If you have a 42-inch Craftsman, Poulan, or Ariens mower and need reliable, affordable replacements for bagging or discharging tall grass, this 4-pack is a solid choice. Avoid if your mower has a non-standard spindle pattern or if you primarily mulch—these are optimized for lifting, not mulching.