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Pillow Block Bearing

Pillow Block Bearings are a type of bearing with a housing that is used to support rotating shafts and couplings in power transmission systems. It consists of a housing (mounting block) and an insert bearing that is usually self-aligning.

The bearing housing is perpendicular to the shaft and has bolt holes that allow the user to secure the pillow block bearing in place. In addition, this type of mounted bearing is sealed and guarded to create a clean, enclosed environment.

Design and variation

Product details

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Model number Basic size Basic load rating Rated speed
Dynamic state Static Reference speed Limiting speed
d [mm] D [mm] B [mm] C [kN] C₀ [kN] [r/min] [r/min]
UC205
 25 52 34.1
UC204
 20 47 31
UC203
 17 47 31
UC202
 15 47 31
UC201
 12 47 31
UCP201
 12
Model number Basic size Basic load rating Rated speed
Dynamic state Static Reference speed Limiting speed
d [in] D [in] B [in] C [Ibf] C₀ [Ibf] [r/min] [r/min]
UC205
UC204
UC203
UC202
UC201
UCP201

Product Type

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Pillow Block Bearing Types & Housing Configurations

1. Standard Pillow Block (UCP Series)

2-bolt base mounting, most common design

Design Features:

  • Two slotted bolt holes in cast iron or steel base
  • Wide inner ring bearing insert with spherical OD for self-alignment
  • Grease fitting on housing for relubrication (sealed units omit this)
  • Popular sizes: UCP201-UCP220 (metric), UCP203-218 (inch)
Applications:
Belt conveyor drives, fan blowers, agricultural implements, packaging machinery

2. Flange Cartridge (UCFC Series)

4-bolt round flange for compact installations

Design Features:

  • Four mounting holes on circular flange
  • Shorter overall height than UCP series
  • Ideal for vertical mounting or space-limited applications
  • Bearing insert identical to UCP—interchangeable inventory
Applications:
Gearbox housings, pump motor adapters, machine tool columns

3. Flange Unit (UCF & UCFL Series)

Square (UCF) or Diamond (UCFL) 4-bolt flange

UCF (Square Flange)

  • Four bolts on square pattern
  • Maximum support rigidity for overhung loads
  • Preferred for new designs where mounting face is flat

UCFL (Diamond Flange)

  • Four bolts on diamond pattern
  • Compact footprint—fits tight corners
  • Two bolts vertically aligned for narrow spaces
Applications:
Conveyor tail pulleys, HVAC air handlers, food processing mixers

4. Take-Up Unit (UCT Series)

Adjustable frame for belt tensioning

Design Features:

  • Slotted guide rails allow 25-50mm horizontal adjustment
  • Spring-loaded or manual adjustment for conveyor belt tension
  • Prevents belt slack in long conveyor runs
  • Common in mining and aggregate applications
Applications:
Conveyor tail shafts, belt tensioners, movable equipment bases

5. Hanger Unit (UCPH Series)

Ceiling/side mounting for suspended shafts

Design Features:

  • Extended base with vertical bolt holes
  • Designed for overhead conveyor systems
  • Routine relubrication from accessible grease fitting
Applications:
Overhead chain conveyors, textile machinery, overhead fans

6. Stainless Steel & Thermoplastic Units

Corrosion-resistant solutions for harsh environments

Stainless Steel (SSUCP Series)

  • AISI 304 or 316 housing and bearing insert
  • NSF H1 certified for food-grade applications
  • Triple-lip seals with stainless steel shrouds
  • Washdown resistant: Survives high-pressure cleaning

Thermoplastic (PBT Series)

  • Reinforced nylon or PBT housing
  • Lightweight—60% lighter than cast iron
  • Chemical resistant for aggressive environments
  • Non-magnetic for cleanroom applications
Applications:

Food processing, pharmaceutical, chemical plants, marine equipment



FAQ

Q1: What's the difference between UCP and UCF pillow block bearings?

A: UCP (pillow block) has a 2-bolt base for horizontal mounting with high stability. UCF (flange) has a 4-bolt square or diamond flange for vertical/horizontal mounting in tight spaces. UCP is more stable for overhung loads; UCF saves space. Both use the same bearing insert—interchangeable inventory.

Q2: Can pillow block bearings handle thrust (axial) loads?

A: Standard pillow block bearings have limited axial capacity (typically<20% of radial rating). For significant axial loads, use UCFL or UCF configurations with shoulder on housing, or select angled housing units (UCPA series). For pure thrust, combine with separate thrust bearings.

Q3: How do I mount a pillow block bearing correctly?

A: Installation process:
  1. Ensure mounting surface is flat (±0.1mm) and rigid
  2. Drill bolt holes to recommended spacing ±0.5mm tolerance
  3. Hand-tighten all bolts first, then torque in cross-pattern
  4. Shaft should slide easily through bearing before locking
  5. For set screw type: tighten screws alternately to 70% torque, then final torque
  6. Check alignment—shaft should rotate freely by hand after mounting
  7. Apply light preload if using eccentric collar

Q4: When should I use stainless steel pillow block bearings?

A: Use 304/316 stainless steel units when:
  • Operating in washdown environments (food, beverage, pharmaceutical)
  • Corrosive chemicals present (pulp & paper, chemical processing)
  • Marine or high humidity applications
  • FDA/USDA compliance required
  • Temperature cycling causes condensation
    Cost premium: 2-3x vs. cast iron, but eliminates rust-related failures