A fine-turned counterface is adequate for V-rings. The appropriate surface roughness values vary depending on the circumferential speed (table). SKF recommends buffing all turned surfaces with an emery cloth to remove any sharp peaks arising from the turning operation. The surface finish should be measured at approximately 90 degrees to the path of the groove to obtain a true reading of the surface.
Counterface treatmentIn the presence of grease, oil or dry lubricants, no special counterface treatment is required. Mild steel counterfaces that are exposed to water or other corrosives should be either zinc-plated or passivated. Chromium- or cadmium-plated shafts should be painted or treated with an anti-corrosive spray.
Additional counterface informationAluminium surfaces should be free of scratch marks. Surface hardness should be > 100 HB in abrasive applications. Die cast aluminium can be used in the as-cast condition.
Steel and cast iron surfaces should be free from lead and sharp tool marks. Cold roll steel stampings can be used without machining.
Plastic counterface materials are generally not acceptable due to poor heat dissipation.
Stainless steel should not be used in dry-running applications unless the speed is below 1 m/s (200 ft/min).