Selecting the right mounted bearing unit is important for improving machine performance, reducing downtime, and extending service life. Below are the key factors to consider when choosing a mounted bearing.

1. Determine the Load Type

Radial Load

If the equipment mainly carries radial force, standard insert ball bearing units are usually sufficient.

Axial Load

If axial force exists, choose a bearing unit with better thrust load capacity.

Heavy Shock Load

For mining, crushers, vibrating equipment, or heavy-duty machinery, spherical roller bearing units are recommended.

2. Confirm Shaft Size

The bearing bore size must match the shaft diameter accurately.

Common Shaft Sizes

• Metric sizes: 20mm, 25mm, 30mm, 40mm, etc.
• Inch sizes: 1”, 1-1/4”, 1-1/2”, etc.

Incorrect shaft matching may cause vibration, overheating, or premature failure.

3. Select Housing Type

Pillow Block Type (UCP)

• Most common
• Mounted on flat surfaces
• Suitable for conveyors and agricultural machinery

Two-Bolt Flange Type (UCFL)

• Space-saving design
• Side-wall mounting applications

Four-Bolt Flange Type (UCF)

• Stronger mounting stability
• Suitable for heavy-duty equipment

Take-Up Unit Type (UCT)

• Adjustable position
• Common in conveyor systems

4. Consider Operating Environment

Dusty Environment

Choose bearings with stronger sealing systems.

Wet or Corrosive Conditions

Use stainless steel or thermoplastic housing units.

High Temperature

Select heat-resistant grease and suitable bearing materials.

5. Check Speed Requirements

High-speed applications require:

• Precision bearings
• Better lubrication
• Lower vibration design

For low-speed heavy-load applications, prioritize load capacity over speed.

6. Choose Proper Housing Material

Cast Iron Housing

• Strong and durable
• Most widely used

Stainless Steel Housing

• Corrosion resistant
• Food and chemical industries

Pressed Steel Housing

• Lightweight
• Economical for light-duty use

7. Verify Sealing Performance

Good sealing helps prevent:

• Dust contamination
• Water ingress
• Grease leakage

Common seal types include:

• Rubber seals
• Triple-lip seals
• Labyrinth seals

8. Consider Lubrication Method

Pre-Greased Bearings

Easy maintenance for general applications.

Relubrication Design

Recommended for continuous industrial operation.

9. Evaluate Installation Space

Check:

• Mounting direction
• Bolt hole dimensions
• Available installation space
• Alignment requirements

Compact flange units are ideal for limited spaces.

10. Choose a Reliable Bearing Supplier

A reliable supplier can provide:

• Stable quality
• Fast delivery
• Technical support
• OEM/branding services
• Consistent performance

For industrial users and distributors, stable supply and long service life are critical factors.

Common Application Industries

Mounted bearings are widely used in:

• Agricultural machinery
• Conveyor systems
• Mining equipment
• Fans and blowers
• Food processing machinery
• Textile machinery
• Construction equipment

Quick Selection Summary

A proper mounted bearing selection can greatly improve machine reliability, reduce maintenance costs, and extend equipment life.