Mower Blade Adapter Kit W/Hex Bolt &Support Washer 753-0609 748-0377 Compatible with Craftsman Cub Cadet Ryobi Troy-Bilt Yard Machines MTD Huskee Montgomery Wards Yard-Man Kawasaki MasterCut

What It Is

This blade adapter kit replaces the center mounting hardware (hex bolt, support washer, and adapter) that secures a lawn mower blade to the crankshaft. It’s designed for single-blade push mowers and some riding mowers using a standard 3/4-inch or 5/8-inch diameter crankshaft.

Fitment & Compatibility

Before buying, check three things:

• Crankshaft diameter – Most compatible models use a 7/8-inch or 1-inch shaft, but measure yours with a caliper.
• OEM part numbers – This kit replaces 753-0609 and 748-0377. It fits Craftsman, Cub Cadet, Ryobi, Troy-Bilt, Yard Machines, MTD, Huskee, Montgomery Wards, Yard-Man, Kawasaki, and MasterCut mowers with that specific adapter design.
• Deck size & blade pattern – Works with standard 5-point star or hex-shaped blade centers. If your blade has a different hole shape (e.g., oval or square), this won’t fit.
• Aftermarket note – Not a genuine OEM part; it’s a compatible replacement. Check your mower’s manual for exact specs.

Key Things to Know

• Quality – Mixed reviews. Some report the bolt strips easily or the washer deforms under torque. Use a torque wrench (30–40 ft-lbs) to avoid overtightening.
• Installation difficulty – Easy. Remove old hardware, clean the shaft, and install new adapter and blade. No special tools beyond a socket wrench.
• Common gotcha – The support washer can be directional. Flat side goes against the blade, raised side toward the adapter. Reverse install can cause blade wobble.
• Longevity – Not as durable as OEM. Expect to replace it every 1–2 seasons if you mow frequently or hit debris.

Should You Buy It

Buy this if you need a quick, low-cost fix for a worn or lost blade adapter on a compatible MTD-style mower and don’t mind replacing it more often than OEM. Skip it if you want long-term reliability or have a non-standard crankshaft—spend the extra $5–10 for a genuine OEM kit.