Oregon 21 Inch Lawn Mower Blade, Mulching Blade for 21" Deck, 21" Length, Direct Replacement for MTD 942-0741, 942-0741A, 742-0741, and 742-0741A and Fits MTD & Ryobi (1 Pack)

What It Is

This is a 21-inch mulching blade designed to chop grass clippings into fine particles that decompose quickly, returning nutrients to the lawn. It’s a direct replacement for MTD OEM blades 942-0741, 942-0741A, 742-0741, and 742-0741A, and fits most 21-inch deck mowers from MTD and Ryobi.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: Only for 21-inch cutting decks. Measure your deck’s width from blade tip to blade tip (not the housing).
• Mounting hole: This blade uses a 5-point star center hole (typical for MTD/Ryobi). Check your existing blade’s hole shape—round or star won’t interchange without an adapter.
• OEM cross-reference: Directly replaces MTD 942-0741, 942-0741A, 742-0741, 742-0741A. Also fits many Craftsman, Troy-Bilt, and Cub Cadet models with same deck and mount. Verify your mower’s model number against Oregon’s compatibility list.

Key Things to Know

• Mulching vs. standard: This blade has a curved, serrated edge and deeper air lift for finer clipping recutting. Not ideal for bagging or side-discharge—it clogs easily if grass is wet or tall.
• Installation: Requires a torque wrench (30-40 ft-lbs) and threadlocker on bolt. Use a blade removal tool or block the blade with wood to prevent spinning. Never hand-tighten.
• Sharpening: Can be sharpened 2-3 times before replacement. Balance after sharpening to avoid vibration and bearing wear.
• Quality: Oregon is a reputable aftermarket brand—thick steel, balanced out of box. Check for burrs on edges before install.

Should You Buy It

Buy this if you have an MTD or Ryobi 21-inch mower with a 5-point star mount and primarily mulch your lawn. It’s a solid, affordable upgrade over worn OEM blades for finer clippings and better nutrient recycling. Skip it if you bag or discharge often—get a standard lift blade instead.