Low-Maintenance Self-Lubricating Ball Joints (QI187, QI250, QI312, QI375, QI500)

In challenging environments where manual lubrication is difficult or where contamination must be avoided, the choice of bearing component is critical. The SYZAGRI QI Series Self-Lubricating Ball Joints are engineered to provide smooth, articulated motion without the need for periodic grease maintenance. Featuring an injection-molded polymer liner, these joints offer a low-friction interface that excels in applications involving constant oscillation and exposure to fine dust.We know that field downtime translates directly into lost revenue. That’s why our QI series is manufactured from high-strength carbon steel with a durable zinc-plated finish to resist environmental corrosion. The internal polymer liner not only eliminates the need for lubrication but also acts as a vibration dampener, absorbing the repetitive shocks typical of agricultural and garden machinery operation. This ensures a tight, responsive connection that maintains machine calibration over longer service intervals.As a field-hardened engineering partner, we provide the QI series in a wide range of standard sizes, from the compact QI187 (10-32 thread) for delicate control linkages to the robust QI500 (1/2-20 thread) for medium-duty mechanical systems. At SYZAGRI, we focus on providing the technical precision—like the exact thread pitch and housing tolerances—needed to restore factory-level tracking to your equipment. Whether you are maintaining a commercial landscaping fleet or designing a custom control system, these self-lubricating joints provide the reliable, clean, and maintenance-free engineering your operation demands.

Verified Compatibility

Replace OEM Part Numbers: QI Series Self-Lubricating Joint, Custom Mechanical Linkage Series

Fits OEM Models: Lawn and Garden Tractor Control Linkages, Agricultural Throttle Systems, Packaging Machinery, and Food Processing Equipment