MTD Genuine Parts (490-100-M067 Mulching Blades-for 21-Inch Lawn Mowers (1995 and After) Fits Various Troy-Bilt, MTD, Yard Machines, and Other Top Models, Natural

What It Is

This is a set of three mulching blades (PN 490-100-M067) for 21-inch walk-behind lawn mowers, designed to chop grass clippings into fine particles that decompose quickly. They fit most MTD, Troy-Bilt, and Yard Machines mowers made from 1995 onward.

Fitment & Compatibility

Before buying, confirm your mower has a 21-inch cutting deck and uses a three-blade system (not a single blade or two-blade setup). Check your owner’s manual or existing blade part number—this replaces OEM numbers 490-100-M067, 742-100-M067, and 942-100-M067. It fits Troy-Bilt TB110, TB120, TB130, TB200, TB230, TB240; MTD 11A, 11B, 11C series; Yard Machines 11A, 11B, 11C series; and Cub Cadet SC100, SC200, SC300. Measure your blade length: these are 21 inches from tip to tip with a 1-inch center hole and a 0.5-inch offset. Not compatible with 20-inch or 22-inch decks, or any mower with a single blade.

Key Things to Know

• OEM quality – These are genuine MTD parts, not aftermarket, so they match factory specs for balance and thickness. Expect consistent performance and no vibration issues.
• Installation difficulty – Moderate. You’ll need a socket wrench and a blade removal tool (or block of wood to prevent spinning). Torque bolts to 35–40 ft-lbs. Always disconnect the spark plug first.
• Mulching only – These blades are not designed for bagging or side discharge. If you switch between modes, you’ll need a different blade set.
• Durability – Made from hardened steel, but they dull faster than standard blades if you mow over dirt or gravel. Sharpen every 10–15 hours of use for best results.

Should You Buy It

If you own a compatible 21-inch MTD/Troy-Bilt/Yard Machines mower from 1995 or later and want fine mulching performance without bagging, this is the correct OEM replacement. It’s ideal for homeowners who prioritize lawn health and don’t need bagging versatility. Avoid if you have a different deck size or prefer a universal aftermarket blade.