Known as: lock nut m 6 / lock nut nm 6 / hexagon nut m 6
Known as: lock nut m 6 m >> 63d 4069 m >> 64d 3716 m >> 63d 8154 m >> 67d 0711 / lock nut m 6 self-locking
These are the self locking copper exhaust nuts to hold on the heat exchangers securely without backing off. very nice built in washer for a secure mating surface. special copper nuts are sold each. 12mm head 8mm hole.