Notes: 138771 SELF-LOCKING NUT M10X1.5 is original CARRARO product. 138771 SELF-LOCKING NUT M10X1.55 is commonly used in transmissions/axles/engines 138527, 138943, 147031, 147036, 381044, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849