Overview
The Thomson SPB12OPN is a Super Ball Bushing pillow block bearing engineered for continuously supported linear motion applications. This 0.750 inch open, self-aligning pillow block features integral double acting seals and is designed for open-type applications. The Super Ball Bushing bearing is self-aligning, lightweight and adjustable with a low coefficient of friction. The adjustable design permits fine-tuning of the diametrical fit-up when installed in adjustable housings.
Key Features
- Self-aligning capability up to 0.5 degree, compensating for inaccuracies in base flatness or carriage machining
- Provides three times the load capacity or 27 times the travel life of conventional linear bearings
- Travel speeds up to 10 ft/s without reduction in load capacity
- Wear-resistant, engineered-polymer retainers and outer sleeves reduce inertia and noise in critical, high-speed applications
- Constant coefficient of friction as low as 0.001
- Radially floating bearing plates; when installed in adjustable housing, may be adjusted to specific diametrical fit-up for accurate and repeatable movement
Technical Specifications
- Shaft Diameter: 3/4 inch (0.750 inch)
- Bearing Type: Steel Ball Bushing
- Design: Adjustable Open
- Dynamic Load Capacity: 600 lbs
- Dimensions (L x W x H): 2-3/4 in x 1.88 in x 1.56 in
- Center Line to Base: 0.937 inch
- Maximum Operating Speed: 3 m/s
- Maximum Temperature: 185°F
- Weight: 0.500 lb
- Sealing: Integral Double Acting Seals
- Series: SPB (Super Ball Bushing Pillow Block)
Typical Applications
The Thomson SPB12OPN is widely used in machinery requiring precise, low-friction linear motion with high load capacity. It is a quick and easy replacement for high friction plain bearings. Enables use of smaller, less expensive drive motors, belts, linkages, gears and ball screws when replacing high-friction plain bearings. Ideal for automated assembly equipment, semiconductor processing machinery, food packaging systems, and precision positioning stages where self-alignment and compact design are essential.
Compatibility & Replacements
Compatible With
- 0.75″ (3/4″) diameter shafts
- Class L precision shafts
- Linear motion systems requiring self-aligning ball bushings
- Adjustable pillow block housings
- Continuously supported application frameworks
Replaces / Drop-In Replacement For
- Industry standard for self-aligning linear bearings; directly replaces worn or failed SPB-series pillow blocks
- Plain bearing and roller bearing assemblies in linear motion applications
- Non-adjustable pillow block versions in applications requiring fine-tuning capability
Works With
- Thomson RoundRailâ„¢ linear motion systems
- Standard metric and imperial shaft sizing protocols
- Open-type housings and continuously supported carriage designs
- Lubrication systems compatible with ball bushing greases
- High-speed linear actuator assemblies
