The nut flange is part of the chain brake and is fastened onto the sprocket guard. It is sold individually, however, your equipment likely has a couple of these. If the housing cracks, this could cause the nut flange to become loose or lost, in which case it will need to be replace with this OEM replacement part. This nut flange (or lock nut) is designed to resist loosening once it has been properly threaded onto a bolt. For this repair you will need a 13mm or 12-inch nut wrench.
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Manufacturer Part Number: V265000200