China Insert Bearings with Housing (Pillow Block Units) - Trusted Suppliers and Quality Factory Products
Key Features
⚙️ 1. Self-Aligning Design
- The spherical outer surface of the bearing and matching spherical bore of the housing allow ±2–5° angular misalignment compensation.
- Eliminates stress concentrations caused by shaft deflection or installation errors.
🛡️ 2. Sealing Options
- Standard Seals: Triple-lip contact seals (e.g., 2RS type) for dust/moisture resistance.
- Enhanced Seals: Multi-layer labyrinth seals for harsh environments (e.g., wastewater treatment).
- Grease Retention: Seals retain lubricant and exclude contaminants.
🔩 3. Clamping Mechanisms
- Set Screw Type (e.g., UC series): Two set screws lock the bearing onto the shaft.
- Eccentric Collar Type (e.g., UE series): Eccentric collar provides secure shaft locking.
- Adapter Sleeve Type (e.g., UK series): Tapered adapter sleeve for easy mounting/dismounting.
🏗️ 4. Housing Materials
- Cast Iron Housings: High rigidity and impact resistance (e.g., SN series).
- Stamped Steel Housings: Lightweight and cost-effective (e.g., SD series).
- Stainless Steel Housings: For corrosive environments (e.g., SS series).
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
| 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
🔧
1. Shaft Fixation Method
Choose set screw type for simplicity; eccentric collar for high-vibration environments.
🏗️
2. Housing Material
Cast iron for heavy loads; stamped steel for lightweight applications.
🛡️
3. Sealing
Use triple-lip seals for dusty/moist conditions; PTFE seals for high temperatures.
💧
4. 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
What angular misalignment can a housed bearing unit tolerate?
Most housed bearing units support ±2–5° of angular misalignment compensation. This is achieved through the spherical outer surface of the bearing insert combined with the matching spherical bore in the housing, allowing the unit to accommodate shaft deflection and minor installation errors without generating harmful stress concentrations.
What is the difference between set screw and eccentric collar clamping types?
Set screw type (UC series) uses two set screws to lock the bearing directly onto the shaft — straightforward and cost-effective for general applications. Eccentric collar type (UE series) uses a rotating locking collar that tightens under operational rotation, providing a more secure and vibration-resistant grip, making it better suited for high-vibration or heavy-load conditions.
Which housing material is best for food processing or corrosive environments?
Stainless steel housings (SS series) are the recommended choice for food processing and corrosive environments. They resist chemicals, moisture, and repeated washdown cycles while meeting food-grade hygiene requirements. For standard industrial environments, cast iron (SN series) offers the best rigidity, while stamped steel (SD series) provides a lightweight, cost-effective option.
How often should housed bearing units be relubricated?
Standard units come pre-greased with lithium-based grease and are designed for extended service without relubrication under normal conditions. For continuous operation, elevated temperatures, or heavy loads, units equipped with a grease nipple should be relubricated periodically — typically every 500 to 2,000 operating hours, depending on the specific application and environment.
What is the operating temperature range for standard housed bearing units?
Standard housed bearing units with rubber seals operate within a temperature range of -30°C to +120°C. For applications exceeding this range, units should be specified with PTFE seals and high-temperature grease. Always refer to the manufacturer's datasheet for guidance on extreme or fluctuating temperature conditions.
Are housed bearing units interchangeable between different manufacturers?
Yes. Housed bearing units are produced to ISO 3228 and ANSI/ABMA dimensional standards, ensuring full interchangeability across manufacturers. Units sharing the same series designation — for example, SN 515 or UCF 205 — can be used as direct replacements regardless of brand, which simplifies maintenance planning and spare parts sourcing.