This knife clip secures the reciprocating knife section to the cutterbar of a grain harvester header. It holds the knife section against the ledger plate, maintaining the cutting gap needed for a clean shear action through the crop. The clip sits at each knife-section joint along the cutterbar. A worn clip increases the gap between the knife and the ledger, allowing crop material to slip through uncut and increasing the force required to drive the knife assembly. This component is manufactured to the original hole spacing and clamp-face geometry, so it seats against the cutterbar without requiring shimming or modification. On installation, use the specified fastener torque and replace any corroded or deformed clips to maintain uniform clamping across the full cutterbar width.