2-Pack 21" Mulching Mower Blades Replacement for Cub Cadet MTD Troy-Bilt 742-05177-L 742P05177-L 490-110-C198 Craftsman CMXGZAM110199, Fits 42" Deck XT1 LT42 XT2 LX42 Z5200

What It Is

This is a 2-pack of 21-inch mulching blades designed to replace OEM models on select Cub Cadet, MTD, Troy-Bilt, and Craftsman lawn tractors. They are intended for use on 42-inch cutting decks and are ideal for mulching grass clippings into fine particles to return nutrients to the lawn.

Fitment & Compatibility

Before buying, confirm your mower deck size is exactly 42 inches (not 46 or 54). These blades replace OEM part numbers 742-05177-L, 742P05177-L, 490-110-C198, and Craftsman CMXGZAM110199. They fit Cub Cadet XT1 LT42, XT2 LX42, and Z5200 models, plus many MTD and Troy-Bilt tractors with 42-inch decks. Measure your existing blade length (21 inches), center hole diameter (typically 1 inch), and drive pin pattern (usually a 5-point star). If your deck has a different spindle or blade adapter, these will not work. Always cross-check your mower’s model number against the manufacturer’s compatibility list.

Key Things to Know

• Quality: Aftermarket blades at this price point are generally sharp out of the box but may not hold an edge as long as OEM. Check for balanced weight and uniform thickness.
• Installation difficulty: Easy—requires a socket wrench and a block of wood to lock the blade. Torque the blade bolt to 40-50 ft-lbs. Do not overtighten.
• Common gotchas: Mulching blades have more curve than standard blades—if your deck lacks a mulching plug or baffle kit, clippings may not discharge properly. Also, these blades are not designed for bagging or side discharge; they work best with a dedicated mulching setup.
• Safety note: Always disconnect the spark plug and wear gloves when handling blades.

Should You Buy It

This 2-pack is a solid budget-friendly option if you have a compatible 42-inch Cub Cadet or MTD tractor and primarily mulch your lawn. It’s best for DIY homeowners who want a quick replacement without paying OEM prices. However, if you need blades for bagging or side discharge, or if your deck requires a specific OEM shape, look elsewhere.