MUGEN MRX-5 Spring Preload Nut 7075 HARD - AM-MRX5-H0755 by Arrowmax  [AM-MRX5-H0755]

MRX-5 spring preload adjuster

This spring adjust nut is designed for MUGEN MRX-5 shock assemblies and compatible spare parts that accept a threaded adjuster. The 7075 HARD designation denotes a tough aluminium grade suitable as a long-lasting upgrade to the standard nut.

Installation is straightforward: remove the shock cap or spring retainer, replace the stock nut with this unit, and check thread action before tightening. You only need standard hobby tools such as hex drivers, but confirm thread compatibility with your MRX-5 shock top before committing to installation.

When tuning, the adjust nut is used to set spring preload and fine-tune ride height on MRX-5 cars. It does not affect the spring's inherent rate or the damper's oil flow, but it offers a dependable surface for repeatable preload settings during setup changes or maintenance.