SB201

The UC series bearings refer to standardized, widely-used pillow block ball bearing units with adapter sleeves. At their core is a deep groove ball bearing featuring a spherical outer diameter (SPB) designed to fit into the matching spherical bore of a cast iron housing. Adhering to metric dimensions, this series is specifically engineered for industrial applications demanding high load capacity, straightforward installation, and dependable performance.

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UC Series Bearings

ISO	SB201
Bore diameter	d	12 mm
Outside diameter	D	40 mm
Overall bearing width	B	22 mm
Width of outer ring	C	12 mm
Center of Bearing from End	s	6 mm
Distance from locking device side face to raceway centre	s1	16 mm
Set screw	ds	M5X0.8
Distance from side face to thread centre	G	4.5 mm
Distance center of OR to center of lubrication zone	F	3.4 mm
Basic dynamic load rating	C	5.8 kN
Basic static load rating	C0	2.8 kN
Mass bearing	0.1 kg

Structure of UC Series Bearings

A typical UC bearing unit comprises the following key components:

Pillow Block Housing:Typically made of grey cast iron or ductile iron (e.g., UC-P suffix), featuring mounting holes (plummer block base, with bolt holes or tapped holes), providing robust support and stability.
Outer Spherical Deep Groove Ball Bearing:The bearing has an inner ring designed to fit onto a standard cylindrical shaft (e.g., tolerance h7). Its outer ring features a spherical outer surface that seats within the housing's spherical bore.
Sealing Arrangement:Equipped with seals on both sides (usually rubber like NBR or FKM) to effectively prevent the ingress of contaminants, dirt, and moisture while retaining internal lubricant.
Locking Device:Primarily utilizes an adapter sleeve (eccentric or withdrawal type) combined with a lock nut and washer. This unique mechanism allows the bearing to be firmly secured to the shaft using friction, greatly simplifying mounting and dismounting processes. (Note: Some UC variants use a tapered bore inner ring with a tapered adapter sleeve).

Key Characteristics of UC Series Bearings

Self-Aligning Capability:The spherical fit between the outer ring and housing bore allows the bearing to accommodate small shaft misalignment (typically up to ±3°), compensating for installation errors or shaft deflection.
Easy Installation and Maintenance:The pre-assembled unit design, combined with the adapter sleeve locking system, enables extremely fast and tool-free mounting/dismounting on cylindrical shafts, minimizing downtime and maintenance costs.
Superior Sealing:Standard seals offer excellent protection against harsh environments, extending bearing life.
Robust Load Capacity:The sturdy cast iron housing and deep groove ball bearing construction provide good radial load capacity and moderate axial load capacity.
Broad Compatibility & Interchangeability:Manufactured to ISO metric standards (IS), ensuring ease of replacement and sourcing of spare parts globally.