Notes: 131951 HEXAGON NUT M18X1.5 C 40 NORM. UNI 10233 is original CARRARO product. 131951 HEXAGON NUT M18X1.5 C 40 NORM. UNI 102335 is commonly used in transmissions/axles/engines 138527, 147031, 147036, 381044, 381045, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849