What is a pillow block bearing?
A pillow block bearing is a mounted bearing unit that combines an insert bearing with a pedestal-style housing. The housing bolts to a support surface, while the insert bearing supports a rotating shaft.
Mounted Bearing Units for Industrial Equipment
Pillow Block Bearings and Mounted Bearing Units
KROX supplies pillow block bearings and mounted bearing units for overseas distributors, MRO buyers, machinery service companies and industrial users. The range covers UCP, UCF, UCFL, UCFC, UCT and related UC insert bearings.
Send the bearing model, shaft diameter, photo, drawing or bearing list for quotation and model confirmation.
Series: UCP | UCF | UCFL | UCFC | UCT | UC
Quick Supplier Facts
- Supplier: Hebei KROX Machinery Technology Co., Ltd.
- Brand: KROX
- Product range on this page: Pillow block bearings, flange bearing units, take-up units and related insert bearings
- Common series: UCP, UCF, UCFL, UCFC, UCT and UC
- Location: Shijiazhuang, Hebei, China
- Customers served: Overseas industrial distributors, spare-parts traders, MRO buyers, maintenance companies and industrial end users
- How to request a quote: Submit bearing models, dimensions, quantities, photos, drawings or a bearing list
What Are Pillow Block Bearings?
A pillow block bearing is a mounted bearing unit that combines an insert bearing with a pedestal-style housing. The housing bolts to a machine frame or support surface while the insert supports the rotating shaft.
Many insert bearings use a spherical outer surface that matches the housing seat, allowing limited initial alignment during installation. This does not correct severe shaft bending or continuous dynamic misalignment.
On this page, pillow block bearing mainly refers to UC-style ball-bearing units. A plummer block bearing may refer to a different housing arrangement, often including split housings. If terminology is unclear, send the full model, dimensions or a photo for confirmation.
KROX Pillow Block Bearing Range
KROX supplies common mounted bearing units and replacement inserts for model-based or list-based RFQs, including:
- UCP pillow block bearing units
- UCF square flange bearing units
- UCFL two-bolt oval flange bearing units
- UCFC round flange cartridge bearing units
- UCT take-up bearing units
- UC insert bearings
- Selected related locking and housing configurations, subject to model confirmation
Common family references include the UCP200, UCF200, UCFL200 and UCFC200 series. UCP300 and UCF300 series inquiries can also be reviewed when the full model and required dimensions are supplied.
A series name identifies the unit family but does not confirm bore, mounting dimensions, seals, locking method or load suitability. Final details must be checked against the complete designation and application.
Common Bearing Unit Series
| Series | Housing Type | Typical Mounting | Common Applications |
|---|---|---|---|
| UCP | Pillow block / pedestal housing | Two-bolt base on a support surface | Conveyors, fans, agricultural machinery and general equipment |
| UCF | Square flange housing | Four-bolt flange on a machine frame or mounting plate | Conveyors, material-handling equipment and packaging machinery |
| UCFL | Two-bolt oval flange housing | Compact two-bolt flange mounting | Light conveyors, agricultural equipment and compact machinery |
| UCFC | Round flange cartridge housing | Round flange mounting on a machine frame | Conveying equipment and general rotating machinery |
| UCT | Take-up housing | Adjustable take-up frame | Belt conveyors and chain systems requiring position or tension adjustment |
| UC | Insert bearing without the complete housing | Installed in a compatible housing or selected custom arrangement | Replacement inserts and assembled mounted bearing units |
This table is a purchasing guide, not an engineering selection standard. Dimensions and suitability depend on the specific model and configuration.
Housing Types
UCP Pillow Block Housing
UCP uses a two-bolt pedestal housing for horizontal support surfaces or machine frames. For replacements, confirm center height and bolt spacing.
UCF Square Flange Housing
UCF uses a four-bolt square flange for mounting to a plate, wall or frame. Confirm the bolt pattern, flange dimensions and shaft position.
UCFL Two-Bolt Oval Flange Housing
UCFL uses a compact two-bolt oval flange where mounting space is limited. Confirm hole spacing and housing profile.
UCFC Round Flange Cartridge Housing
UCFC uses a round flange cartridge housing. For replacements, confirm the full model and mounting dimensions.
UCT Take-Up Housing
UCT fits take-up frames where shaft position or belt tension requires adjustment.
Cast iron housings are common, but material, dimensions and finish should be confirmed by model.
Insert Bearing Options
The insert bearing is the rotating component fitted inside the housing. A typical UC insert uses a spherical outer surface, an extended inner ring and set screws to secure it to the shaft.
Other locking methods may be available by series and configuration:
- Set screw locking: Common on UC insert bearings and suitable for many general industrial applications.
- Eccentric locking collar: Available on selected insert-bearing configurations; the complete designation is required for confirmation.
- Adapter-sleeve locking: Used with selected tapered-bore insert configurations. It is not a default feature of standard UC units.
Locking styles are not automatically interchangeable. Check shaft tolerance, rotation, load, speed and installation method before changing the original configuration.
For replacement inserts, send the full bearing marking, shaft diameter and clear photos of both sides to help confirm the locking and sealing arrangement.
Materials and Construction
Materials, surface treatment, internal design and grease specification vary by model.
Key construction points to confirm include:
- HousingStyle and material
- InsertBearing series and bore size
- LockingShaft locking method
- SealsSeal arrangement
- LubricationLubrication method
- MountingDimensions and application conditions
If a project requires a specific material, coating, seal or lubricant, include it in the RFQ. Do not select a unit by housing appearance alone.
Sealing and Lubrication
Many mounted bearing inserts are sealed and pre-lubricated for initial service, and some designs can be relubricated through a grease fitting. Relubrication needs depend on the model, speed, load, temperature, contamination and duty cycle.
Some configurations are intended for reduced-maintenance or maintenance-free service. For dusty, wet, high-temperature or washdown applications, include the operating environment in the RFQ so seal and grease options can be reviewed.
Load, Alignment and Operating Conditions
Pillow block ball-bearing units mainly carry radial load and may also accommodate moderate axial load depending on the insert design and operating conditions. Allowable load, speed and temperature depend on the specific bearing, housing, shaft fit, locking method and lubrication.
The spherical outer surface of many inserts allows limited initial alignment inside the matching housing, but it is not a solution for continuous shaft deflection or major alignment errors. For demanding loads, speed, temperature or contamination, include the operating data in the RFQ.
Common Applications
Common applications include:
- Belt and roller conveyors
- Fans and blowers
- Agricultural machinery
- Material-handling systems
- Packaging machinery
- Textile and light-processing equipment
- General plant and maintenance equipment
- Machinery repair and replacement projects
Selection still depends on shaft size, mounting arrangement, load, speed, environment and maintenance.
How to Select a Pillow Block Bearing
1. Choose the Mounting Arrangement
Match the housing to the machine structure: UCP pedestal base, UCF square flange, UCFL two-bolt oval flange, UCFC round flange cartridge or UCT take-up frame.
2. Confirm the Shaft Diameter and Bore Size
Match the insert bore to the shaft. State metric or inch size and provide the exact shaft diameter.
3. Check the Mounting Dimensions
For replacements, compare center height, bolt-hole spacing, flange or locating dimensions and overall housing size. Similar model names may not be dimensionally interchangeable.
4. Confirm the Locking Method
Confirm whether the shaft uses set screws, an eccentric collar, an adapter sleeve or another locking method. If the original design must be retained, send a photo or drawing.
5. Review Load, Speed and Duty
Provide load, speed, duty cycle and any relevant shock or vibration data. KROX can review the requested configuration; final machine design remains the responsibility of the buyer or equipment engineer.
6. Describe the Operating Environment
Mention dust, moisture, washdown, outdoor exposure, temperature, chemicals or corrosion concerns because they can affect housing, seals, grease and maintenance.
7. Confirm Lubrication and Maintenance Requirements
State whether the unit must be relubricatable or maintenance-free and include any required maintenance schedule.
8. Verify the Complete Model Before Ordering
Use the full model from the existing bearing, package, drawing or equipment manual. If the model is unclear, send dimensions and clear photos.
What Information to Send for an RFQ
For a clear quotation, send the following information:
- Bearing model: Full unit or insert bearing designation
- Shaft diameter / bore size: Metric or inch
- Required quantity: Quantity for each model
- Housing type: UCP, UCF, UCFL, UCFC, UCT or another required style
- Application: Machine type and use
- Preferred brand: Include it only when the project specifies a brand
- Operating conditions: Load, speed, temperature, contamination or lubrication requirements when relevant
- Destination country: Required for export and shipping communication
You may also attach product photos, labels, drawings or a spreadsheet with multiple bearing models.
Packaging & Export Supply
Hebei KROX Machinery Technology Co., Ltd. is based in Shijiazhuang, Hebei, China and supplies bearings to overseas industrial buyers.
Packaging depends on product model, quantity, shipment method and buyer requirements. Individual boxes, cartons, labels, pallets or crates can be arranged as needed.
For export quotations, send the destination country and any required carton marks, labels or packing instructions with the bearing list.
Frequently Asked Questions About Pillow Block Bearings
What is the difference between UCP and UCF bearings?
UCP uses a pedestal housing with a two-bolt base and is mounted on a support surface. UCF uses a square four-bolt flange housing and is mounted against a machine frame or plate. The correct choice depends on the available mounting structure and required dimensions.
What is a UC bearing insert?
A UC bearing is an insert ball bearing with a spherical outer surface and, commonly, an extended inner ring secured to the shaft by set screws. It fits a compatible mounted bearing housing. The exact locking and sealing design must be confirmed by model.
How do I choose the correct pillow block bearing size?
Start with the shaft diameter or bore size, then confirm the unit series, mounting-hole pattern, center height or flange dimensions, insert locking method, load, speed and operating environment. Use the full model or a dimensional drawing to verify interchangeability.
Can pillow block bearings be relubricated?
Many pillow block bearing units can be relubricated through a grease fitting, depending on the housing and insert design. Some selected configurations are intended for reduced-maintenance or maintenance-free service. The lubrication method and interval must match the specific model and application.
Can a pillow block bearing accommodate shaft misalignment?
The spherical outer surface of many insert bearings allows limited initial alignment inside a matching housing. It is not intended to compensate for continuous shaft deflection, severe misalignment or unstable mounting surfaces.
What information is required for a quotation?
Send the full bearing model, shaft diameter or bore size, quantity, housing type, application, preferred brand if specified, relevant operating conditions and destination country. Photos, drawings or a bearing list help with model confirmation.
Can KROX supply bearing units for export orders?
Yes. Hebei KROX Machinery Technology Co., Ltd., located in Shijiazhuang, Hebei, China, supplies pillow block bearings and mounted bearing units for overseas industrial buyers. Packaging, labeling and shipping requirements are confirmed during quotation and order communication.
Can I send a bearing list or product photo if the full model is unclear?
Yes. Send the bearing list, clear photos of the product and markings, shaft diameter or bore size, required quantity and any known mounting dimensions. KROX can use the information to help confirm the requested model before quotation.
What should I check when replacing an existing pillow block bearing?
Confirm the full model, shaft diameter or bore size, housing style, center height or flange dimensions, bolt-hole spacing, locking method and seal arrangement. Units that look similar are not always dimensionally interchangeable.
Need UCP, UCF, UCFL, UCFC, UCT or UC Insert Bearings?
Send the model list, quantities and destination country. KROX will confirm the housing and insert configuration before quotation.
Email: sales@kroxbearing.com
WhatsApp: +86 156 1435 3886
Company: Hebei KROX Machinery Technology Co., Ltd.
Location: Shijiazhuang, Hebei, China