53AX9
Nut SELMUL100
Mack

Selmul100 specification nuts are designed for high‑duty fastening tasks where reliable torque transmission and vibration resistance are critical. This nut type typically interfaces with bolts and studs in structural or mechanical assemblies, providing secure clamping force even under fluctuating temperatures and heavy loads. Correct engagement requires clean threads, appropriate lubrication, and a matching thread pitch to avoid galling or loosening under dynamic conditions. Choosing the right nut is essential for maintaining alignment and preventing joint fatigue, particularly in chassis, mounting brackets, and powertrain interfaces where a loose fastener can lead to misalignment and wear. The SELMUL100 variant denotes a precise size or grade intended for specific Mack truck applications, so compatibility with the corresponding bolt and washer is key. In service, periodic re‑inspection after extended operation helps catch creeping torque loss before it affects performance. Source One Parts Center.