Steering Coupler Steel 3 /4-36 X 3/4 Smooth Bore

The Borgeson Steering Coupler Steel 3/4-36 X 3/4 Smooth Bore (MPN 313400) is a precision-engineered weld-on steering shaft coupler designed to connect a 36-spline steering shaft to a smooth-bore input shaft. Built from steel in a natural finish, this universal coupler accommodates the critical interface between modern aftermarket steering boxes and custom-fabricated steering columns in performance vehicles, hot rods, and specialized automotive applications where shaft alignment and torque transfer demand reliable mechanical connection.

The 3/4-inch 36-spline end connects to standard modern steering box outputs, while the 3/4-inch smooth-bore end accepts custom or fabricated input shafts without requiring additional keyways or set-screw complications. Steel construction provides the rigidity necessary to handle steering feedback and road-induced vibration without deflection or wear. The weld-on design eliminates reliance on fasteners that can loosen over time, creating a permanent, vibration-dampening connection once properly installed. Dimensions of 3.7 x 1.55 x 5.3 inches and a weight of 0.5 lbs make this coupler straightforward to integrate into confined engine bay layouts common in restoration and custom build projects.

This coupler is engineered for builders and restorers who are matching modern steering components to custom or non-standard column configurations. It solves the common challenge of shaft diameter and spline-count mismatch when upgrading steering systems in vintage vehicles or fabricating purpose-built steering assemblies. Proper welding of the coupler to the smooth-bore shaft ensures concentricity and eliminates runout that could cause steering vibration or premature wear on bearings and gear boxes.

Borgeson is recognized in the automotive restoration and fabrication community for manufacturing steering system components that meet OEM tolerances and durability standards. This steel coupler represents a core mechanical solution for builders seeking quality shaft couplers without proprietary or oversized interfaces that complicate sourcing and installation.