Mugen MRX-5 spring steel engine nut by Arrowmax AM-MRX5-H0704  [AM-MRX5-H0704]

Spring-steel engine nut for MRX-5

This engine nut is an RC-scale replacement part designed for Mugen MRX-5 platforms, supplied under Arrowmax part AM-MRX5-H0704. Machined as a compact fastener, the spring steel construction focuses on retaining clamping force where vibration and repeated use can loosen conventional nuts.

Use and fitment notes: the nut is intended for the engine mounting area of MRX-5 chassis and works with the standard threaded studs used on that platform. It functions as a retention element to help maintain preload on the mounting stud during running and routine adjustments. Because it is a small mechanical part, confirm thread match with your MRX-5 studs before installation and replace like-for-like when worn.

Tuning role: this type of spring-steel nut is typically part of preventative maintenance and setup checks, used to reduce loosening under vibration and to keep engine alignment stable during on-track adjustments. It does not change engine performance but supports consistent mechanical connection.