The John Deere R57820 is a genuine OEM Grade 5 shear bolt designed for critical applications in John Deere agricultural and construction machinery. This robust bolt features a 9.525mm (0.375 inch) diameter and a 69.85mm (2.75 inch) length, with a 3/8-16 thread. It serves as a sacrificial component to protect driveline and PTO systems from overload, ensuring the longevity of more expensive components. Essential for maintaining the operational integrity and safety of compatible John Deere tractors, combines, sprayers, and other heavy equipment.