Spherical Bearings for Off-Road Vehicle Suspension Systems

Three Layers of Engineering in a Single Spherical Bearing

The suspension system of an off-road vehicle must absorb constant impacts from rocks, ruts, and uneven terrain while maintaining precise steering control. Through its Heim brand, RBC Bearings developed the COM Series maintenance-free spherical bearings specifically to meet the demanding requirements of the off-road vehicle industry. The bearing features a three-layer construction, with each layer serving a distinct purpose. The inner ring, which forms the bearing ball, is manufactured from heat-treated alloy steel to provide exceptional strength and is finished with a chrome-plated surface for superior wear resistance. The outer ring, or race, is made from steel to provide the strength required for demanding industrial applications and is protected by a corrosion-resistant coating designed to withstand harsh environmental conditions. Between these two metallic components is the maintenance-free liner—a self-lubricating bearing liner that delivers high dynamic load capacity, low friction, and extended service life while eliminating the need for periodic grease or oil application in a suspension joint that would otherwise require frequent maintenance. According to RBC, common applications for the COM Series include ATVs and UTVs, golf carts, race cars, trucks, lift kits, and general suspension systems—particularly in environments where mud, dust, and moisture are part of normal operating conditions. For vehicles that spend much of their service life off-road, a suspension joint that does not require routine lubrication offers a significant advantage: less maintenance downtime, a reduced risk of dirt contaminating lubrication points, and more predictable long-term service life. At BIOSA, we apply the same selection criteria when recommending spherical bearings for industrial equipment operating in dusty or contaminated environments. A layered construction featuring a protected self-lubricating liner between two durable bearing rings often makes the difference between a component that delivers years of reliable service and one that requires frequent replacement.