NSK UCP208D1 Two-Bolt Pillow Block Bearing Unit
NSK UCP208D1 is a high-reliability two-bolt diamond-shaped pillow block bearing unit, composed of a UC208D1 spherical insert bearing and a heavy-duty cast iron P208D1 housing. The suffix "D1" specifically denotes the set screw locking mechanism, which ensures secure shaft fixation even in vibrating and shock-loaded applications. Compliant with ISO and JIS standards, this unit is pre-filled with high-quality lithium-based grease and features an integrated sealing system.
NSK UCP208D1 is a high-reliability two-bolt diamond-shaped pillow block bearing unit, composed of a UC208D1 spherical insert bearing and a heavy-duty cast iron P208D1 housing. The suffix "D1" specifically denotes the set screw locking mechanism, which ensures secure shaft fixation even in vibrating and shock-loaded applications. Compliant with ISO and JIS standards, this unit is pre-filled with high-quality lithium-based grease and features an integrated sealing system, making it suitable for various industrial environments requiring low maintenance and stable operation.
Core Dimensions & Weight
| Parameter | Value |
|---|---|
| Shaft Diameter (d) | 40 mm (1.575 in) |
| Housing Length (L) | 184 mm |
| Housing Width (A) | 54 mm |
| Center Height (H) | 49.2 mm (1.937 in) |
| Overall Height (H2) | 98 mm |
| Bolt Hole Spacing (J) | 137 mm |
| Mounting Bolt Size | M14 |
| Net Weight | Approximately 2.14 kg (4.72 lbs) |
| Insert Bearing Model | UC208D1 |
| Housing Model | P208D1 |
Technical Performance Ratings
| Parameter | Value |
|---|---|
| Basic Dynamic Load Rating (C) | 29.1 kN (6,542 lbf) |
| Basic Static Load Rating (C₀) | 17.8 kN (4,002 lbf) |
| Locking Mechanism | Set screw locking (two set screws on extended inner ring) |
| Seal Type | Double lip contact seals with metal slinger |
| Self-alignment Angle | ±2° |
| Operating Temperature Range | -30°C to +130°C (-22°F to +266°F) |
| Limiting Speed (Grease Lubrication) | 3,700 r/min |
| Reference Speed | 3,200 r/min |
| Radial Clearance | Normal (Standard Clearance) |
| Pre-filled Lubricant | High-quality lithium-based grease |
Structural Features & Advantages
- Reliable Set Screw Locking: Two case-hardened alloy steel set screws ensure firm shaft clamping, effectively preventing shaft slippage under heavy torque, vibration, or frequent start-stop conditions. The locking method enables easy installation and disassembly without damaging the shaft surface.
- High-Rigidity Cast Iron Housing: The P208D1 housing is made of HT250 high-strength gray cast iron with precision casting and reinforced rib design, providing excellent vibration damping and impact resistance to adapt to harsh industrial environments.
- Efficient Sealing Protection: The integrated double lip contact seals (nitrile rubber) and metal slinger form a dual protection system, which effectively retains internal lubricant and blocks the ingress of external dust, debris, and moisture, significantly extending the service life of the bearing.
- Excellent Self-Aligning Capability: The spherical outer diameter of the UC208D1 insert bearing allows ±2° angular misalignment compensation, which can effectively absorb shaft deflection or installation errors, avoiding additional stress on the bearing and ensuring smooth operation.
- Low-Maintenance Design: Factory pre-filled with high-performance lubricant, no additional lubrication is required before initial use. The standardized structure ensures good interchangeability, allowing easy replacement of insert bearings when needed.
- NSK Precision Manufacturing: The insert bearing adopts SUJ2 high-carbon chromium bearing steel raceways and balls with precision grinding and proprietary surface treatment, ensuring low friction, low noise, and consistent performance.
Applications
This bearing unit is widely used in various industrial equipment requiring stable and reliable shaft support, especially in medium-load and medium-speed scenarios:- Heavy-duty conveyor systems and material handling equipment
- Agricultural machinery (combines, harvesters, grain elevators, augers)
- Industrial pumps, blowers, and air compressors
- Textile, printing, and packaging machinery
- Mining and construction auxiliary equipment
- Woodworking and metalworking machinery
- Ventilation and HVAC systems
