For those special applications, QA1’s HCOM and HCOM-T Large Bore Series spherical bearings are a great solution. With bore sizes from one to two inches, these spherical bearings are ideal for large applications. Each bearing is made from chromoly steel with an optional self-lubricating PTFE liner. BALL, 52100 Bearing Steel, Heat Treated, Hard Chrome Plated, Precision Ground, , LINER (HCOM-T), PTFE, Self-Lubricating, , RACE, Chromoly Steel, Heat Treated, Protective Coated for Corrosion Resistance.