China Factory Suppliers of Insert Bearings with Housing - Durable Pillow Block Units for Easy Installation
Key Features
1 Self-Aligning Design
- Spherical outer surface allows ±2–5° angular misalignment compensation
- Eliminates stress concentrations from shaft deflection or installation errors
2 Sealing Options
- Standard: Triple-lip contact seals (2RS type) for dust/moisture resistance
- Enhanced: Multi-layer labyrinth seals for harsh environments
- Grease Retention: Seals retain lubricant and exclude contaminants
3 Clamping Mechanisms
- Set Screw (UC series): Two set screws lock bearing onto shaft
- Eccentric Collar (UE series): Secure shaft locking
- Adapter Sleeve (UK series): Easy mounting/dismounting
4 Housing Materials
- Cast Iron (SN series): High rigidity and impact resistance
- Stamped Steel (SD series): Lightweight and cost-effective
- Stainless Steel (SS series): For corrosive environments
Product Structure
⚙️ Bearing Component
Wide inner ring for secure shaft locking. Heat-treated chromium steel rings and balls.
🏠 Housing Component
Base with mounting holes (bolt or slot types). Reinforced ribs for structural stability.
🔒 Sealing System
Triple-lip rubber seals (standard) or PTFE seals for high temperatures.
💧 Lubrication
Pre-greased with lithium-based grease (standard). Grease nipple for relubrication (optional).
Types & Series
1
Pillow Block Housings (SN, SNU series)
Most common type for general industrial use.
2
Flange Housings (F, FC series)
For vertical or side-mounted applications.
3
Take-Up Housings (T, NAT series)
Adjustable for belt tensioning in conveyor systems.
4
Two-Bolt Housings (SB, SBD series)
Compact design for space-constrained applications.
Applications
-
🔄
Conveyor Systems
Roller supports, drive shafts -
🌾
Agriculture
Grain augers, irrigation systems -
🍽️
Food Processing
Washdown environments (stainless steel variants) -
🧵
Textile Machinery
Low-noise, high-speed operations -
💨
Ventilation Systems
Fan and blower shafts
Technical Specifications
| Parameter | Specification |
|---|---|
| Shaft Diameter Range | 20 mm to 100 mm (common sizes) |
| Operating Temperature | -30°C to +120°C (standard seals) |
| Limiting Speed | 50–80% of deep groove ball bearings due to seals |
| Load Capacity | Primarily radial loads; limited axial capacity |
Selection Guidelines
🔩 Shaft Fixation Method
Choose set screw type for simplicity; eccentric collar for high-vibration environments.
🏗️ Housing Material
Cast iron for heavy loads; stamped steel for lightweight applications.
🛡️ Sealing
Use triple-lip seals for dusty/moist conditions; PTFE seals for high temperatures.
💧 Lubrication
Relubrication options required for continuous operation or high temperatures.
Advantages
-
✔
Easy Installation Pre-assembled unit reduces mounting time.
-
✔
Reduced Maintenance Sealed and pre-lubricated for long service life.
-
✔
Misalignment Tolerance Compensates for shaft/housing misalignment.
-
✔
Interchangeability Standard dimensions per ISO 3228 and ANSI/ABMA standards.
Frequently Asked Questions
Q
What is the difference between a set screw type and an eccentric collar type bearing unit?
Set screw type (e.g., UC series) uses two set screws to lock the bearing directly onto the shaft, making it simple to install and suitable for light to moderate loads. Eccentric collar type (e.g., UE series) uses a rotating collar that tightens against the inner ring, providing more secure locking and better performance in high-vibration environments.
Q
How much angular misalignment can a housed bearing unit accommodate?
Standard housed bearing units with a spherical outer surface can compensate for ±2° to ±5° of angular misalignment. This self-aligning capability helps eliminate stress concentrations caused by shaft deflection or minor installation errors, extending the service life of both the bearing and the shaft.
Q
Which housing material should I choose for a corrosive or food processing environment?
For corrosive environments or food processing applications where washdown is required, stainless steel housings (e.g., SS series) are the recommended choice. They offer excellent corrosion resistance and are easy to clean. PTFE seals can also be paired with stainless steel housings for added chemical resistance at higher temperatures.
Q
What is the standard operating temperature range for housed bearing units?
With standard rubber seals and lithium-based grease, housed bearing units typically operate within a temperature range of -30°C to +120°C. For applications exceeding this range, PTFE seals and high-temperature grease should be selected, and relubrication intervals may need to be shortened.
Q
Do housed bearing units require regular relubrication?
Most housed bearing units come pre-greased with lithium-based grease and are designed for long-term, low-maintenance operation. However, for continuous operation, high-temperature environments, or applications with heavy contamination, units equipped with a grease nipple are recommended to allow periodic relubrication and extend service life.
Q
Are housed bearing units interchangeable between different manufacturers?
Yes. Housed bearing units are manufactured to standardized dimensions in accordance with ISO 3228 and ANSI/ABMA standards. This means that units from different manufacturers with the same designation are generally interchangeable in terms of mounting dimensions, making replacement and sourcing straightforward.