Description

When you’re running a flail mower through tall grass, weeds, or brush, those cup knives take a beating. If you’ve noticed your cut quality going downhill or found chipped and worn blades on your flail head, it’s time to swap them out. This replacement cup knife fits a wide range of popular flail mowers including John Deere 25, 25A, 360, 370, and 390 models, keeping your mowing operation running smooth.

What You’re Getting

Durable steel construction that stands up to rocks, stumps, and daily abuse
Cup-shaped design that creates excellent airflow for better cutting action
Direct replacement for John Deere P66945 and several other OEM part numbers
Precise 3-7/8 inch length and 2-7/8 inch width for proper fit and balance
Slotted hole design makes installation straightforward with the right hardware

Built for Real Farm Work

This knife works on a variety of flail mowers from different manufacturers, making it handy to keep a set on the shelf. Whether you’re maintaining fence rows, clearing ditches, or chopping up crop residue, these knives handle the tough cutting jobs that rotary mowers can’t touch. The cup design helps create the airflow that flail mowers are known for, giving you that clean, even cut.

Made to Last

Flail knives see some of the roughest conditions on the farm, and this one’s built accordingly. The steel construction holds its edge well, and when it does wear down, the cup shape means it keeps cutting effectively longer than flat blades. You’ll get plenty of hours before needing to flip or replace them.

Good to Know

You’ll need the matching D-ring hardware to mount these properly—either the 7/16 inch or 1/2 inch size depending on your setup. It’s worth checking all your knives at the same time since they tend to wear at similar rates. Keep a few spares handy during busy mowing season.