Mounted bearings
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Frequently asked questions
What does the mounted bearing code UCP205 mean?
UC is a ball insert held on the shaft by set screws, P is a pillow block housing, and 205 means a series 2 insert with a 25 mm bore. Other common housings are F (square 4-bolt flange), FL (2-bolt oval flange) and T (take-up unit). Changing the housing while keeping the insert number keeps the same shaft size.
Can I replace only the insert in a mounted bearing?
Yes, the UC insert can be replaced separately if the cast iron housing is not cracked and its spherical bore is not worn. The insert has a spherical outer surface for self-alignment, so it must be tilted into the slots in the housing to fit. If the housing is loose or its foot is broken, replace the complete unit.
Set screw or adapter sleeve: which shaft locking should I use?
Set screw locking (UC) is simple and economical for moderate load and speed, but can loosen under heavy vibration or reversing duty. An adapter sleeve (UK insert with H sleeve) clamps evenly around the shaft, handles vibration better and tolerates wider shaft tolerances. Tighten set screws to the specified torque and use thread locker where vibration is present.
Cast iron or stainless housing: how do I choose?
Grey cast iron housings suit most dry indoor plant applications. In food processing or areas washed down with water and chemicals, stainless or engineering plastic housings with stainless inserts resist corrosion better. Check load ratings, since a plastic housing carries less load than a cast iron one of the same size.
What should I watch when bolting a mounted bearing to the frame?
The base surface must be flat and rigid, and any shims must cover the full foot so the cast housing does not crack when the bolts are tightened. Tighten the base bolts first, then the set screws or sleeve nut, so no misaligning stress is locked into the shaft. On a long shaft with two units, fix one and let the other float axially for thermal expansion.
How often should a mounted bearing be greased through its nipple?
Most UC type units have a grease nipple for relubrication, and the real interval depends on speed, temperature and humidity, from a few weeks in wet conditions to several months in clean, dry ones. Pump a few slow strokes while the shaft turns slowly so grease spreads evenly without pushing the seals out. Wipe the nipple clean before greasing so dirt is not injected.
Why does a mounted bearing come loose and wear the shaft?
The usual causes are set screws not tightened to torque, or a shaft below the required tolerance so the insert creeps on it. Vibration and shock loads can back off set screws, so recheck them after the first few hours of running. For heavy or frequently reversing loads, an eccentric collar or adapter sleeve lock grips the shaft more securely.
What information is needed to order a replacement mounted bearing?
Please provide the full code marked on the housing and insert, such as UCF208 or UCFL206, together with the shaft diameter. If the code is lost, measure the bolt hole centre distance, the shaft centre height from the base and the housing style (pillow block, square flange, two bolt flange). Also state the operating environment, such as washdown, high temperature or dust, so the right seal and material can be chosen.
