This stationary knife is the cutting element mounted on the chopper drum of a forage harvester. It shears crop material against a stationary counter-knife as the drum rotates, reducing the harvested crop to the desired particle length. The knife is a fixed (non-pivoting) blade, meaning it maintains a constant clearance with the counter-knife during operation. A dull or chipped cutting edge increases the specific energy required to process the crop and produces a ragged cut, which can affect silage quality and increase wear on downstream components. This original-manufacturer part is formed to the same profile and mounting-hole geometry as the original assembly, so it seats correctly on the drum without requiring shimming or modification. When replacing, inspect the counter-knife and adjust the clearance to the harvester's specification.