Jack Bolt Boss

The Jack Bolt Boss is a precision-engineered threaded boss designed for automotive mechanics and fabricators who need reliable mounting solutions for aftermarket components, sensors, and accessories on modern vehicles. Whether you're installing custom gauge pods, turbo boost controllers, air-fuel ratio meters, or auxiliary engine management hardware, this versatile threaded insert provides a clean, professional anchor point where factory mounting options don't exist. Built by U-B MACHINE (MPN 35-1100), the Jack Bolt Boss serves as an essential fastening component for serious vehicle modification work.

This compact threaded boss measures 2.15 x 1.6 x 3.75 inches and weighs just 0.38 lbs, making it lightweight enough for underhood installations without adding unnecessary mass or heat-soak risk. The precision-threaded design ensures repeatable, vibration-resistant connections—critical when mounting electronic sensors or mechanical components in high-vibration engine compartments where loose fittings can lead to sensor drift, electrical noise, or component failure. The compact footprint allows integration into tight spaces where traditional welded or bolted solutions prove impractical, while the threaded interface accommodates standard fasteners for secure, adjustable positioning without permanent modification to factory sheet metal or cast components.

Mechanics and performance enthusiasts use the Jack Bolt Boss across a wide range of applications: custom intake manifold sensors, turbocharger wastegate controllers, electric fan thermostat mounts, and auxiliary lighting harness anchors. Installation typically involves securing the boss to a vehicle frame rail, firewall, or chassis member using grade-8 bolts or self-tapping fasteners, then threading aftermarket components directly into the boss—eliminating the need for additional brackets or adapters. Its universal design works across domestic and import platforms, making it a shop essential for shops performing LS engine swaps, turbocharged builds, or comprehensive engine bay reorganizations where factory attachment points become obsolete.