Notes: 054028R1 HEXAGON NUT DIN 74361 M18X1.5 is original AGCO-MF-VALTRA product. 054028R1 HEXAGON NUT DIN 74361 M18X1.51 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849