138971 Gator Mulching Blades for 42" Deck, 532138971 Mower Blades Compatible with Craftsman Hus-qvarna Pou-LAN Lawn Tractor, Replaces 134149, 127843, 138498, 422719, 2 Pack

What It Is

This is a set of two 42-inch Gator mulching blades designed to replace OEM blades on Craftsman, Husqvarna, and Poulan Pro lawn tractors. They use a wave-shaped cutting edge to recut clippings into fine mulch, ideal for frequent mowing without bagging.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 42 inches (measured blade tip to tip). These blades replace OEM part numbers 134149, 127843, 138498, and 422719, and fit most Craftsman, Husqvarna, and Poulan Pro models with a 42" stamped or fabricated deck. Check your blade’s center hole size (should be 1-inch hex) and overall length (approximately 20.5 inches). Verify your deck’s spindle pattern—these are for single-bolt mounting, not three-bolt. Double-check your mower’s model number against the manufacturer’s parts list to avoid returns.

Key Things to Know

• Quality: Gator blades are made from heat-treated steel and hold an edge well, but they are heavier than OEM blades, which may slightly increase vibration on older spindles.
• Installation: Easy to swap with a socket wrench. Use a blade removal tool or block wood to prevent spinning. Torque to 40-50 ft-lbs.
• Common gotchas: These are mulching blades, not lift blades—they won’t discharge clippings well if you side-discharge. Also, they may not fit decks with a curved center hole or non-standard spindle design.
• Balance: Check blade balance after mounting; some users report needing to ream the center hole for a perfect fit on certain Craftsman models.

Should You Buy It

If you have a 42-inch Craftsman, Husqvarna, or Poulan Pro tractor and want a durable, effective mulching upgrade for under $30, these are a solid buy. They’re best for frequent mulching on flat lawns—skip them if you need side discharge or have a deck with an unusual spindle pattern.