5/8-18 RH Alum Jam Nuts Thin OD 4pk

The 5/8-18 RH Alum Jam Nuts Thin OD 4pk from Allstar Performance are designed for automotive applications where thread security and weight reduction are important. These jam nuts, also known as lock nuts, serve as a secondary fastening point to prevent loosening due to vibration in various assemblies, including carburetors and intake manifolds.

Manufactured from aluminum and machined to a 5/8-18 right-hand thread specification, these thin-profile jam nuts feature a reduced outer diameter to fit in tight spaces while minimizing weight compared to standard hex nuts. Their design allows them to nest closely against a standard nut, creating a dual-locking system that helps resist loosening under vibration.

These nuts are particularly beneficial for engine builders and fabricators working on street rods, race cars, and custom platforms where weight is a concern. The 4-pack quantity provides spares for multiple assemblies or future projects, making them a practical choice for those engaged in automotive restoration or performance modifications.