BGD Mower Blade Adapter Kit for MTD Craftsman, 25mm, Fixes Vibration | 25mm Precision Fit, Replaces 748-04227 + 5 More, Fits Troy-Bilt Ryobi Bolens, Cast Steel Build, Eliminates Blade Wobble

What It Is

This adapter kit replaces the OEM blade adapter (748-04227 and 5 others) on MTD/Craftsman, Troy-Bilt, Ryobi, and Bolens mowers with a 25mm center hole. It solves blade wobble and vibration caused by worn or out-of-round factory adapters.

Fitment & Compatibility

Before buying, verify these three things:

• Center hole size: Must be 25mm (1 inch). Measure your blade’s center hole—if it’s 7/8″ or 1-1/8″, this kit won’t fit.
• Deck & model: Fits most MTD-built decks from 2000 onward, including Craftsman (917 series), Troy-Bilt (TB110, TB120), Ryobi (40V/80V brushless), and Bolens. Not compatible with Honda, Toro, or John Deere.
• OEM cross-references: Replaces 748-04227, 742-04227, 742-04227B, 742-04227A, 742-04104, and 742-04104A. If your mower uses a different adapter number, measure the center hole and shaft diameter (likely 7/8″ or 1″ hex).

Key Things to Know

• Cast steel vs. stamped steel: Cast steel is denser and resists bending, but it can be brittle if overtightened. Torque to 50–60 ft-lbs—no more.
• Installation: Remove the old adapter with a puller or penetrating oil (common rust issue). New adapter slides onto the crankshaft; you may need to shim if the blade sits too high or low.
• Vibration fix: If your blade still wobbles after installing, check the blade itself for bent or unbalanced condition. The adapter only fixes wobble from the adapter, not the blade.
• Warranty note: Aftermarket part—voids OEM warranty if installed on a mower still under coverage.

Should You Buy It

Buy this if your MTD/Craftsman/Troy-Bilt mower has a 25mm hole and you’re dealing with vibration from a worn or loose factory adapter. It’s a cheap, direct fix for a common problem, but skip it if you need a different hole size or if your mower is under warranty.