This drive chain transmits power from the gearbox to the reel on the header of a grain harvester. It engages with the sprockets on the reel drive shaft, rotating the reel to lift and guide crop material toward the cutterbar. A worn or stretched chain causes the reel to slip or run at an incorrect speed, leading to uneven crop feeding and increased header losses. The chain is manufactured to the original pitch and roller diameter specifications, so it seats correctly on the existing sprockets without requiring shimming or adjustment of the drive tensioner. When replacing, inspect the sprocket teeth for wear and replace them if hooking or sharpening is present.