Upper A Arm 8.5 Steel Screw In Ball Joint

The U-B MACHINE Upper A Arm 8.5 Steel Screw In Ball Joint (MPN 19-0829-6L) is a precision tubular upper control arm engineered for custom suspension systems and heavy-duty off-road applications. Manufactured from steel with black powder coat protection, this 8.5-inch arm features a screw-in ball joint design that allows field replacement and adjustment without requiring arm removal—a critical advantage for operators maintaining or tuning suspension geometry in remote locations or on demanding terrain.

The 1.5-inch offset geometry is critical for controlling caster angle, kingpin inclination, and load distribution. Tubular construction minimizes mass while maintaining rigidity under high-stress suspension cycles. The screw-in ball joint configuration provides durability and repeatability, enabling consistent front-end geometry even after extended use in sand, rocks, and variable terrain. Steel composition with powder coat finish resists corrosion in coastal, salt-laden, and high-humidity environments where many operators conduct missions or training. At 3.62 lbs, the arm delivers structural capability without unnecessary vehicle weight penalty.

This arm is engineered for custom fabricators, off-road specialists, and serious enthusiasts building lightweight, purpose-built suspension systems. The universal fitment and modular ball joint design allow integration into multiple chassis configurations where OEM parts are unavailable or unsuitable. Typical applications include tactical vehicle builds, expedition platforms, high-angle off-road recovery rigs, and competition suspension setups where geometry tuning and field serviceability are non-negotiable.

U-B MACHINE specializes in tubular suspension components for the custom and competition market. This product represents the precision manufacturing and material science required for reliable performance where suspension failure creates operational risk or mission delay. The screw-in ball joint standard allows cross-compatibility with other quality manufacturers' ball joints, providing future upgrade flexibility and avoiding single-source dependency.