Notes: 502823 STUD M18X69 8.8 ACCIAIO CL. 8.8 UNI EN 2 is original TEREX product. 502823 STUD M18X69 8.8 ACCIAIO CL. 8.8 UNI EN 21 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849