Mugen MRX-5 Spring Lock Nut for Engine Mounts - Arrowmax AM-MRX5-H0704  [AM-MRX5-H0704]

Spring lock nut designed for MRX-5

This part is a replacement engine nut specified for Mugen MRX-5 models and is supplied under Arrowmax part AM-MRX5-H0704. The compact fastener is formed from spring steel to provide elastic retention where vibration and repeated use can loosen ordinary nuts.

Compatibility and fitment: intended for the engine mount area of MRX-5 chassis, the nut is compatible with the common threaded studs fitted to that platform. It serves to preserve preload on the mounting stud during running and maintenance tasks. Always confirm thread size and fit before installation and swap out the nut when signs of wear appear.

Practical use: commonly included in preventative maintenance and setup checks, a spring-steel locking nut reduces the chance of loosening under vibration and helps maintain stable engine alignment while adjusting settings. It does not alter engine output but supports a reliable mechanical joint.