748-0376E(25𝐌𝐌 Center Hole) Lawn Mower Blade Adapter Kit Replace MTD 748-0376 748-0376A 748-0376B 748-0376C, | Fits MTD Craftsman Troy-Bilt Ryobi Yard Machines Bolens Yard Man Push Walk-Behind Mowers

What It Is

This is a blade adapter kit designed to mount a standard 5-point star center hole blade onto a push mower with a 25mm (approx. 1-inch) round crankshaft. It replaces the factory adapter on many MTD-built walk-behind mowers, allowing you to use a wider range of replacement blades.

Fitment & Compatibility

Critical check: Measure your crankshaft diameter. This kit fits 25mm (1-inch) round shafts only—not 7/8" or 22mm. Also verify your blade has a 5-point star center hole (common on MTD/Troy-Bilt/Craftsman). The kit includes the adapter, a key, and a bolt.

Fits these brands/models (MTD-built): MTD, Craftsman, Troy-Bilt, Ryobi, Yard Machines, Bolens, Yard Man—most walk-behind mowers with 25mm crankshafts. Does not fit Honda, Toro, John Deere, or Snapper (different shaft designs).

Deck size: Works with any deck size that uses a 5-point star blade—typically 21" to 22" push mowers.

OEM vs aftermarket: This is an aftermarket replacement for MTD OEM part numbers 748-0376, 748-0376A, 748-0376B, 748-0376C, and 748-0376E (note the “E” suffix is often the OEM version). If your mower originally had a different adapter shape (e.g., a round or D-shaped hole), this kit won’t work without also changing the blade.

Key Things to Know

• Installation is straightforward – Remove the old blade and adapter, slide the new adapter onto the shaft, align the key, and torque the bolt to 35–50 ft-lbs. Use thread locker if not provided.
• Quality is mixed – Some users report the adapter fits loosely on the shaft or the key shears under heavy use. Inspect the key slot and shaft condition before installing.
• Blade selection matters – This adapter only works with blades that have a 5-point star center hole. If your current blade has a different hole shape, you’ll need a new blade too.
• Check bolt size – The included bolt may be metric (M10x1.25 or M8x1.25). Verify it matches your crankshaft threads—common on MTD but not universal.

Should You Buy It

Buy it if you have an MTD-built push mower with a 25mm round shaft and need to replace a lost or worn factory adapter, or want to switch to a non-OEM blade. Skip it if your shaft is a different size (measure first) or if you need a premium-grade adapter for commercial use—this is a budget-friendly fix for homeowner mowers.