The JCB 33137239 is a genuine OEM M20 lock nut designed for secure fastening in a wide range of JCB agricultural and construction equipment. This essential component ensures reliable performance and prevents loosening in high-vibration applications. It features an M20 x 1.5mm thread and a height of 16mm, weighing approximately 0.04 kg. Compatible with numerous JCB models including Loadall telehandlers, Fastrac tractors, and JS series excavators.