942-0640 Blade Compatible with 20" Deck MTD Yard Machines Walk Behinds Replaces OEM-742-0640, 942-0640, 742-0640, 490-100-M115, 1 Pack

What It Is

This is a 20-inch replacement blade for walk-behind mowers, designed to cut grass on standard residential lawns. It fits MTD Yard Machines and similar brands with a 20" deck.

Fitment & Compatibility

Before buying, check your mower’s deck size (must be exactly 20"). This blade replaces OEM part numbers 742-0640, 942-0640, and 490-100-M115. It fits most MTD, Yard Machines, Yard Man, Cub Cadet, Troy-Bilt, and Craftsman walk-behinds with a 20" stamped steel deck. Measure your current blade’s length, center hole diameter (usually 7/8"), and thickness to confirm match. Verify your mower uses a single straight blade—this is not a mulching or gator-style blade. If your model has a different mounting system (e.g., offset or pin-style), it won’t work.

Key Things to Know

• Quality: Made from hardened steel, but not as thick as OEM premium blades—may wear faster under heavy use.
• Installation: Straightforward if you have a socket wrench and block of wood to lock the blade. Torque to 30–40 ft-lbs.
• Gotcha: Double-check the blade’s “sail” (lift curve) orientation before mounting—wrong side up reduces cutting performance.
• Common issue: Some users report the blade is slightly lighter than OEM, causing vibration if the mower isn’t balanced after install. Balance it before use.

Should You Buy It

Buy this if you need a budget-friendly, direct-fit replacement for a standard 20" MTD/Yard Machines walk-behind and don’t mind slightly less durability than OEM. It’s fine for average-sized lawns (under 1/2 acre) and occasional use. Skip it if you want a thicker, longer-lasting blade or need a mulching/performance design.