New Aftermarket 22" Lawn Mower Blade Fits Craftsman Replaces 420463 421825

What It Is

This is a direct-replacement 22-inch steel mower blade designed for Craftsman walk-behind mowers, typically used on residential lawns. It replaces OEM part numbers 420463 and 421825, making it suitable for standard cutting and bagging.

Fitment & Compatibility

Check deck size: This blade is exactly 22 inches long—measure your current blade from tip to tip. It fits most Craftsman 22-inch steel or aluminum decks from the 1990s onward.

Model fit: Confirmed for Craftsman models like 917 series (e.g., 917.376090, 917.377490, 917.378740) and many 247 series. Verify your model number under the seat or on the deck.

OEM vs aftermarket: This is an aftermarket blade, not OEM. It matches the center hole diameter (usually 1-inch) and offset of originals, but finish or balance may vary slightly.

Measurements: Check the center hole is 1-inch round; if your mower uses a star-shaped hole, this blade won’t fit. Also confirm the blade’s thickness (typically 0.25 inches) matches your spindle.

Key Things to Know

• Quality: Aftermarket steel is generally adequate for residential use, but may not hold an edge as long as OEM. Inspect for burrs or uneven edges before installing.
• Installation difficulty: Easy—requires a socket wrench and a blade removal tool (or a block of wood to jam the blade). Torque the bolt to 40–50 ft-lbs. Always disconnect the spark plug first.
• Common gotcha: Balance can be off. After installation, spin the blade by hand—if it wobbles, you’ll need to re-balance or replace. Use a blade balancer (under $10).
• Sharpening: You can sharpen it 2–3 times before replacement, but avoid overheating the steel (causes brittleness).

Should You Buy It

If you own a compatible Craftsman 22-inch walk-behind and need a budget-friendly replacement for clean, occasional cuts, this blade works well. It’s not for commercial use or tough, thick grass—those scenarios call for a premium OEM or mulching blade. For most homeowners, it’s a solid value at $24.