5/8-18 LH Tube End - 1-1/4in x .095in

The 5/8-18 LH tube end is a precision weld-on threaded fitting designed for custom fabrication, hydraulic systems, and chassis work where left-hand female threads are required. This component bridges tube-to-component connections in demanding applications, from race car suspension systems to aftermarket firearm builds and heavy equipment assembly. Left-hand threads prevent accidental loosening under vibration and rotation, making this fitting essential for safety-critical builds where standard right-hand threading would be unsuitable.

Manufactured from chromoly steel in natural finish, the 5/8-18 LH tube end accommodates 1-1/4 inch outer diameter tubing with a 0.095 inch wall thickness. The chromoly construction provides superior strength and weldability compared to mild steel, making it ideal for high-stress applications where thermal cycling and impact loads are common. The threaded female end accepts 5/8-18 left-hand male connectors, hoses, or rod ends, while the tube end is prepared for welding to create permanent, leak-free joints that maintain full bore diameter and flow characteristics.

Builders and fabricators working with 1-1/4 inch chromoly tubing will find this fitting indispensable for hydraulic lines, brake systems, and custom chassis assembly. Installation requires welding the tube end flush to your tubing OD, after which standard 5/8-18 LH fittings screw directly in without adapters. The compact 1.55 x 1.55 inch footprint and 3.8 inch length ensure clearance in tight spaces, while the 0.42 pound weight keeps overall assembly weight minimal—critical for performance and racing applications where every ounce counts.