China Insert Bearings with Housing Suppliers - High-Quality Pillow Block Units from Reliable Factory
Key Features
1 Self-Aligning Design
- Spherical outer surface allows ±2–5° angular misalignment compensation
- Eliminates stress 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)
- 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)
🧵
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
Q
What is the maximum angular misalignment a housed bearing unit can compensate for?
Standard housed bearing units can compensate for ±2–5° of angular misalignment. This is achieved through the spherical outer surface of the bearing insert mating with the matching spherical bore of the housing, allowing the shaft to tilt without inducing harmful stress concentrations.
Q
What is the difference between set screw, eccentric collar, and adapter sleeve clamping types?
Set screw types (UC series) use two screws to lock directly onto the shaft — simple and cost-effective for light-to-medium loads. Eccentric collar types (UE series) use a rotating collar that wedges against the shaft, offering better resistance to vibration and shock loads. Adapter sleeve types (UK series) use a tapered sleeve for tool-free mounting and dismounting, ideal for larger shafts or frequent maintenance.
Q
Which housing material should I choose for a food processing or washdown environment?
Stainless steel housings (SS series) are the recommended choice for food processing, washdown, and other corrosive environments. They resist rust and chemical cleaning agents. Paired with PTFE or stainless-compatible seals, they meet hygiene and durability requirements in these demanding applications.
Q
How often should housed bearing units be relubricated?
Most housed bearing units come pre-greased with lithium-based grease and are designed for long service intervals. For standard operating conditions, relubrication may not be required for the bearing's service life. However, for continuous operation, high temperatures, or contaminated environments, units with a grease nipple should be relubricated at regular intervals as specified by the manufacturer.
Q
What operating temperature range do standard housed bearing units support?
Standard housed bearing units with rubber seals operate reliably between -30°C and +120°C. For applications exceeding this range, PTFE seals and high-temperature grease should be specified. Always verify the temperature rating of both the seal material and the lubricant when operating near the limits.
Q
Are housed bearing units interchangeable between different manufacturers?
Yes. Housed bearing units are manufactured to standardized dimensions defined by ISO 3228 and ANSI/ABMA standards. This means units from different manufacturers with the same designation (e.g., UCF205, SN 505) are dimensionally interchangeable, simplifying replacement and reducing downtime during maintenance.