20933999
Nut
Mack

This nut provides reliable engagement with a compatible bolt or stud for general purpose assemblies requiring secure fastening. It is chosen for adequate thread engagement, resistance to loosening under vibration, and compatibility with surrounding materials and coatings. Correct pairing with the corresponding bolt, washer, and torque specification ensures proper clamping force and minimizes the risk of joint failure on the road. In heavy‑duty applications, factors such as temperature extremes, exposure to road contaminants, and frequent maintenance cycles influence the nut’s life. Regular torque checks and thread inspection help preserve joint integrity and vehicle performance. Ensure the nut type and size match the OEM specification for the intended interface. Source One Parts Center.