Notes: 2171443 SELF-LOCKING NUT UNI 7474/DIN985 M24X1.5 is original CATERPILLAR product. 2171443 SELF-LOCKING NUT UNI 7474/DIN985 M24X1.51 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849