Mower Mulching Blades 138971 fits for 42" Poulan/Husqvar/Craftsman 2 Blades Set Replaces 561713XB 138498 532138971 138971x431 PP24005

What It Is

This is a 2-blade set of mulching blades for 42-inch cutting decks, designed to replace OEM part numbers 138971, 561713XB, 138498, and 532138971. Mulching blades have a curved, serrated edge that recirculates grass clippings for finer cutting and natural lawn fertilization.

Fitment & Compatibility

• Deck size: Only for 42-inch decks. Measure your deck from spindle to spindle or check your mower’s model specs.
• Brand fit: Fits many Poulan, Husqvarna, and Craftsman models (including some AYP/Electrolux-built units) with a 42" deck. Not universal—verify your mower’s deck part number.
• Measurements: Each blade is approximately 21.5 inches long, with a 1-inch center hole and 5-point star pattern. Check your existing blade for length, center hole shape, and thickness (about 0.25 inches).
• OEM vs aftermarket: This is an aftermarket set. It’s a direct replacement for OEM parts listed above, but always confirm your exact model number (e.g., 917.xxxxx) against the seller’s compatibility list.
• What to check: Blade length, center hole shape (star vs round), and number of mounting holes. Also ensure your mower uses two blades (not one long or three short).

Key Things to Know

• Quality: Customer rating is 4.6/5 (3 reviews). Limited feedback—be cautious. Some aftermarket blades may be thinner or less balanced than OEM.
• Installation: Easy if you have a socket wrench and blade removal tool. Always disconnect the spark plug and tip the mower with the carburetor side up to prevent oil leaks.
• Gotcha: Mulching blades require a mulching plug or kit on many mowers. Without it, you’ll get poor clippings discharge. Check your deck has a mulching baffle or buy the kit.
• Sharpness: Blades typically arrive uncoated and may need light sharpening before first use. Re-sharpen every 25 hours of cutting.

Should You Buy It

This is a solid budget-friendly option if you own a 42-inch Poulan, Husqvarna, or Craftsman mower and want mulching capability instead of bagging or side-discharge. Verify your deck size and model number first, and consider OEM blades if you prioritize durability and verified fit over saving a few dollars.