Thomson TWN8OPN Super Pillow Block Linear Bearing

Description:

The Thomson TWN8OPN Super Ball Bushing Twin Open Pillow Block Bearing is used in precision linear motion systems to provide smooth, self-aligning linear travel on 1/2-inch (0.500-inch) Class L continuously supported round shafts. Commonly installed in CNC machines, robotics, packaging equipment, material handling systems, semiconductor equipment, and industrial automation machinery, this open-type twin pillow block features a lightweight aluminum housing, adjustable Super Ball Bushing bearings, and a self-aligning design for accurate, low-friction linear motion. Maintenance teams and system integrators use this part for repair, retrofit, expansion, or replacement of precision supported-shaft linear guide systems.

Applications:

The Thomson TWN8OPN is designed for continuously supported shaft applications requiring high rigidity, smooth travel, and precise positioning. Its twin open pillow block configuration provides increased stability while allowing use on supported shafts. The adjustable, self-aligning bearing design compensates for shaft misalignment and ensures consistent performance in CNC machinery, automated assembly equipment, packaging systems, robotics, semiconductor equipment, inspection systems, and custom OEM linear motion applications.

Technical Specifications:

• Manufacturer: Thomson Industries
• Manufacturer Part Number (MPN): TWN8OPN
• Product Type: Super Ball Bushing Twin Open Pillow Block Bearing
• Series: Super Ball Bushing®
• Bearing Style: Open
• Pillow Block Type: Twin
• Bearing Configuration: Twin Linear Bearing
• Housing Material: Aluminum
• Bearing Material: Hardened Steel with Engineered Polymer Retainers
• Nominal Bore (ID): 0.500 in (12.70 mm)
• Compatible Shaft Class: Class L Continuously Supported Shaft
• Overall Length (B): 3.500 in (88.90 mm)
• Overall Width (A): 2.000 in (50.80 mm)
• Overall Height (H1): 1.130 in (28.70 mm)
• Body Width (A2): 0.750 in (19.05 mm)
• Centerline Height (G): 0.560 in (14.22 mm)
• Mounting Hole Centers (E2): 2.500 in (63.50 mm)
• Mounting Hole Diameter (N): 0.160 in (4.06 mm) (#6)
• Dynamic Load Capacity: 460 lbf (2,046 N)
• Self-Aligning: Yes
• Adjustable: Yes
• Number of Ball Circuits: 4
• Maximum Operating Temperature: 185°F (85°C)
• Weight: 0.40 lb (0.181 kg)
• Lubrication Access: Oil Lubricant Fitting
• Seals: Integral Double-Acting Seals (variant dependent)
• Roll Pack: No
• Food Grade Rated: No
• Corrosion Resistance: Standard (Not Corrosion Resistant)
• Features: Open design for continuously supported shafts, twin pillow block construction, self-aligning bearing plates, adjustable fit, lightweight aluminum housing, engineered polymer retainers, low-friction operation, reduced operating noise, and extended service life. 

Common Replacements:

• Thomson TWN8OPN-DP
• Thomson TWN8OPN-LL
• Thomson TWN8OPN-LS