5/8-18 LH Tube End - 1-1/4in x .058in

The 5/8-18 LH Tube End from MEZIERE is a precision left-hand threaded fitting designed for custom cooling system fabrication and high-performance engine builds. This component serves as a critical interface point in custom radiator hose assemblies, allowing mechanics and fabricators to construct bespoke coolant pathways tailored to tight engine compartment layouts. It is ideal for street rods, classic muscle car restorations, and competition-spec cooling systems.

Measuring 1-1/4 inches in tube diameter with a wall thickness of 0.058 inches, this fitting is designed to provide the necessary structural integrity for high-flow cooling applications. The 5/8-18 left-hand thread pitch is engineered to mate with standard MEZIERE adapters and water pump ports, ensuring proper sealing and reducing the risk of vibration-induced loosening common in engine bays. The left-hand configuration allows for flexible installation options in various engine layouts.

This MEZIERE tube end is particularly beneficial for fabricators working on custom cooling systems for big-block engine conversions, restomod projects, and race car builds. Its design supports efficient coolant routing while maintaining system integrity under pressure and thermal cycling. Whether you're a professional mechanic or an enthusiastic DIYer, this fitting is an essential component for achieving optimal cooling performance.