Notes: Y00723 SELF-LOCKING NUT UNI 7474 M18X1.5 8 is original ERKUNT product. Y00723 SELF-LOCKING NUT UNI 7474 M18X1.5 81 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849