UDC Parts 942-0741A Mower Blades 21 Inch Replacement for Troy Bilt TB130 TB240 TB160 TB115 TB230 Craftsman M230 M250 Cub Cadet Yard Machines 742-0741 742-0741A 942-0741 CMXGZAM100067 / Mulching 2 Pack

What It Is

This is a 21-inch mulching blade set (2-pack) designed for select Troy-Bilt, Craftsman, Cub Cadet, and Yard Machines walk-behind mowers. It replaces OEM part numbers 742-0741, 742-0741A, and 942-0741, and is intended for use on residential lawns with frequent mulching or bagging.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Your mower must have a 21-inch cutting deck – this blade will not fit 20-inch or 22-inch decks.
• Center hole & spindle fit: The blade has a 5-point star center hole (common on MTD/Cub Cadet spindles) with a 1-inch diameter. It will not fit standard round-hole or oval-hole spindles.
• Model numbers: Confirmed fit for Troy-Bilt TB130, TB115, TB160, TB230, TB240; Craftsman M230, M250; Cub Cadet SC100, SC300, XT1; Yard Machines 11A series. Cross-check your mower’s model number (often on a sticker under the seat or near the rear wheels) against the seller’s list.

Note: This is an aftermarket blade, not OEM. It’s made by UDC Parts and is a direct replacement for the listed OEM numbers.

Key Things to Know

• Mulching vs. bagging: The curved, high-lift design works well for mulching and bagging, but is less efficient for side-discharge – if you mostly side-discharge, consider a standard lift blade.
• Installation difficulty: Easy – just one center bolt. Use a torque wrench to tighten to 30–40 ft-lbs. No special tools needed, but a blade removal tool or block of wood helps lock the blade.
• Durability: The steel is heat-treated and hardened, but users report they dull faster than OEM blades on sandy or rocky lawns. Expect to sharpen or replace after 10–15 hours of heavy use.
• Balance: Each blade is factory-balanced, but always check balance after sharpening. An unbalanced blade will vibrate and damage the spindle.

Should You Buy It

Yes, if you need a budget-friendly, direct-fit mulching blade for a common 21-inch MTD-platform mower and don’t mind slightly faster wear than OEM. Skip it if you need a side-discharge blade or your mower has a non-standard spindle (round hole or oval). For the price, it’s a solid value for regular mulching and bagging.