Cartridge Bearing Units

A standard pillow block (UCP200) or flange unit (UCF200) is a self-contained housing that bolts onto the surface of a machine frame. A cartridge bearing unit (UCFC200, UCC200) is designed to be installed into a bore machined in the machine frame or casting itself — the housing becomes part of the machine structure rather than an external component. This reduces the external envelope of the bearing position and eliminates the housing foot or flange plate from the external machine surface. The insert bearing and locking mechanism are the same UC-family components used in standard pillow blocks and flanges.

A flange cartridge unit (UCFC200) has a square or rectangular flange plate with a round precision pilot on the back face. The pilot locates the unit concentrically in a matching bore and the flange bolts lock it in place, allowing easy removal and reinstallation. A cylindrical cartridge unit (UCC200) has a plain cylindrical OD with no flange plate — it is held in a round bore by interference fit, a retaining grub screw, or a circlip. The cylindrical format gives a smaller external footprint and a fully recessed bearing position, but is less easily removed than the flanged type.

Rubber-mounted bearing units (RSB205, RCSA200/RCSB200, RSAPP200/RSBPP200) are specified wherever the drive generates significant vibration or impact that would be transmitted to the machine frame through a rigid bearing mount — vibratory screens, agricultural machinery over rough terrain, conveyor drives subject to load impacts, and any position where premature bearing failure on a rigid mount is a recurring problem. The rubber element attenuates vibration transmission, absorbs radial shock loads, and accommodates minor misalignment. They are not interchangeable with standard rigid cartridge units and require the machine bore to be sized for the rubber-mounted housing OD.

Yes. The UC-family insert bearing in UCFC200 is the same as the insert used in UCF200 (4-bolt flange), UCFL200 (2-bolt oval flange), and UCP200 (pillow block) for the same bore size. NAFC200 uses the same NA eccentric collar insert as NAF200; UEFC200 uses the same UE concentric collar insert as UEF200; UKFC200+H uses the same UK tapered bore insert as UKF200+H. One insert spare covers both cartridge and non-cartridge housing formats for the same bore.

UCFCS200 uses housing dimensions derived from inch fractions — pilot diameter, flange plate dimensions, and bolt-hole positions correspond to inch-standard cartridge bearing positions. When the machine frame bore and bolt pattern are already machined to inch-standard dimensions, UCFCS200 drops in directly without re-boring or re-drilling. For new machine designs in metric, UCFC200 is the standard choice. UCFCSX00 is the medium-duty version of the same inch-based housing with a higher-rated UCX insert.

The pilot is a raised circular register on the back face of the flange cartridge housing that fits into a matching bore in the machine frame to an h7/H7 or similar transition fit. It locates the housing concentrically relative to the shaft before the flange bolts are tightened, eliminating dependence on bolt-hole clearance for bearing position accuracy. It also enables repeatable reinstallation — when a cartridge bearing is replaced, the new unit locates in exactly the same position as the original without re-alignment.