M12 - 12mm FLANGED NYLOC NYLOCK LOCK NUTS TYPE T BRIGHT ZINC PLATED BZP DIN 6926
M12 x 12mm Flanged Nylon Locking Nuts (DIN 6926) - Stainless Steel (A2). The elastic Nylon insert of this component fits firmly against the fastener, and is intended to withstand loosening when subjected to harsh vibrations.