This genuine JCB part number 10904171 is an M16 nut, essential for secure fastening in a wide range of JCB agricultural and construction equipment, including popular 3CX and 4CX backhoe loaders, JS series excavators, Loadall telehandlers, and Fastrac tractors. Manufactured to JCB's precise specifications, this original component ensures optimal fit, durability, and performance for critical applications.