Overview
The Thomson SPB24 is a closed-type Super Ball Bushing pillow block bearing engineered for precision linear motion applications. Designed for 1.5-inch diameter Class L shaft use in end-supported applications, this SPB24 pillow block combines self-aligning bearing geometry with robust aluminum housing to deliver repeatable, low-friction performance across industrial automation, machinery, and motion control systems.
Key Features
- Self-Aligning Design: Up to 0.5° self-aligning capability compensates for inaccuracies in base flatness or carriage machining
- Low Coefficient of Friction: Lightweight with wear-resistant, engineered-polymer retainers and outer sleeves that reduce inertia and noise in critical, high-speed applications
- Closed-Type Housing: Designed for end-supported shafting applications
- Radially Floating Bearing Plates: When installed in an adjustable housing, allows adjustment to a specific diametrical fit-up for accurate and repeatable movement
- High-Speed Capability: Travel speeds up to 10 ft/s without reduction in load capacity; maximum 3 m/s
Technical Specifications
The SPB24 meets industrial motion control standards with the following specifications:
- Shaft Diameter: 1.5 inches (Class L)
- Housing Type: Closed, non-adjustable
- Dynamic Load Capacity: 2000 lbf
- Overall Dimensions: 4.75″ L × 4.0″ W × 3.25″ H
- Center Shaft Height: 1.75 inches from base
- Bearing Material: Aluminum housing
- Operating Temperature Range: Maximum +185°F
- Weight: 3.8 lbs
- Mounting: Four bolt holes for fixed installation
Typical Applications
Closed-type bearings are for end-supported applications, making the SPB24 ideal for:
- CNC machinery and automated production lines
- Linear actuator assemblies
- Conveyor systems and indexing tables
- Industrial positioning equipment
- Material handling and transfer systems
- End-span or bridge applications where a shaft is supported at both ends
Compatibility & Replacements
Compatible With
- 1.5-inch (Class L) precision-ground round shafts
- End-supported linear motion systems
- Adjustable and fixed base mounting systems
- Industrial automation platforms requiring pillow block bearings
- Systems with operating temperatures to +185°F
Replaces / Drop-In Replacement For
- SPB24-L4L: Long-length variant with extended bearing cavity
- SPB24-CR: Corrosion-resistant variant (same core bearing, stainless fasteners)
- SPB24-OR: Out-rigger configuration for overhung load support
Works With
- Thomson Linear RoundRailâ„¢ shaft systems
- Standard industrial pillow block mounting patterns
- Class L precision shafting standards
- Ball Bushing bearing assemblies with factory-installed bearings
