331740B Mower Blade, Lawn Mower Blades for 22 in.Craftsman, Husqvarna, Poulan Mowers, Replaces OEM no. 420463, 421825, 437601, 532421825, 532437601

What It Is

The 331740B is a 22-inch universal replacement blade for gas walk-behind mowers, designed for mulching or bagging on Craftsman, Husqvarna, and Poulan models with a 22-inch cutting deck.

Fitment & Compatibility

• Deck size: Only fits mowers with a 22-inch cutting deck. Measure your old blade’s length (end to end) to confirm.
• OEM replacements: Replaces Craftsman OEM numbers 420463, 421825, 437601, 532421825, and 532437601. Also fits select Husqvarna and Poulan models using the same blade pattern.
• Center hole: 7/8-inch round with a 5-point star drive. Check that your mower’s spindle matches this shape—some older models use a different hole pattern.
• Brand check: Not compatible with every 22-inch deck; double-check your mower’s model number on the manufacturer’s site or the old blade’s part number. Common models include Craftsman 917 series, Husqvarna 7021P, and Poulan PPB22.

Key Things to Know

• Quality: Medium-carbon steel with a painted finish. Not as hard as OEM high-carbon blades, so expect slightly faster dulling on sandy or rocky lawns.
• Installation: Easy—lift mower, remove old blade with a socket wrench, and torque new blade to 40-50 ft-lbs. Use a blade balancer after install to prevent vibration.
• Gotchas: The star drive hole can be tight on some spindles; file lightly if needed. Never reuse old hardware—use the included bolts if provided.
• Performance: Works well for mulching dry grass but may clog in wet, thick growth. Sharpen after 10-15 hours of use for best cut.

Should You Buy It

If you need a budget-friendly, drop-in replacement for a 22-inch Craftsman, Husqvarna, or Poulan mower and don’t mind slightly shorter lifespan than OEM, this blade is a solid value. Skip it if you mow rough terrain regularly or require premium hardened steel.