Replace 742-04308 942-0616 Mower Blades, 21" Mower Blade 742-0616A Compatible with Cub Cad et MTD 42" Mower Deck, 742-0616 Mulching Blades Fit for Cub Cad et Troy-Bilt LT1040 LT1042 RZT42, 2 Pack

What It Is

This is a set of two 21-inch mulching blades designed to replace OEM parts 742-04308, 942-0616, and 742-0616A. They’re built for 42-inch mower decks on Cub Cadet, Troy-Bilt, MTD, and similar models—ideal for homeowners who want finer clippings for lawn nutrition without bagging.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: These are 21-inch blades for a 42-inch deck (three blades total). If your deck is 46" or 50", these won’t fit.
• Model numbers: Confirmed fit for Cub Cadet LT1040, LT1042, RZT42, and Troy-Bilt equivalents. Check your mower’s model number against the OEM part numbers listed (742-04308, 942-0616, 742-0616A).
• Measurements: Blade length is 21", center hole diameter is 1", and offset is 3/4". Measure your current blade’s center hole and offset—if different, these won’t mount correctly.

These are aftermarket blades, not OEM. Quality and balance can vary, but reviews suggest they’re reliable for the price.

Key Things to Know

• Mulching vs. standard: These are mulching blades (curved with more lift). They chop clippings finer than standard blades but may leave clumps in wet grass or thick growth.
• Installation difficulty: Moderate. You’ll need a socket wrench and a blade removal tool (or a block of wood to prevent spinning). Torque to 70-90 ft-lbs—overtightening can strip the spindle.
• Common gotcha: These blades are sold as a 2-pack. For a 42" three-blade deck, you’ll need to buy two packs or mix with a compatible third blade. Check your deck’s blade count.
• Sharpness out of box: They’re sharp enough to cut grass but not razor-sharp. If you want maximum cut quality, give them a quick hand-file before first use.

Should You Buy It

Yes, if you have a compatible 42-inch Cub Cadet or Troy-Bilt mower and want an affordable mulching upgrade for average-sized lawns. Skip them if you need OEM exactness, have a larger deck, or prefer standard lift blades for bagging. For $24, they’re a solid value for the fit.