A-A31867-AI Lock Nut; M12 X 1.75 Hex DeflectedOne New Aftermarket Replacement Lock Nut Fits John Deere Equipment This M12 x 1. 75 hex deflected thread lock nut is a general purpose metric fastener used across a wide range of Fits John Deere agricultural, construction, and lawn and garden equipment. The deflected thread (prevailing torque) locking design resists loosening under vibration and heavy loads without the need for a nylon insert, making it suitable for high temperature and heavy duty