Thomson TWN8 Super Ball Bushing Twin Pillow Block Bearing 1/2

Description:

The Thomson TWN8 Super Ball Bushing Twin 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 round shafts. Commonly installed in CNC machines, robotics, packaging equipment, automated assembly systems, material handling equipment, and industrial automation machinery, this closed-type twin pillow block features a lightweight aluminum housing, integral double-acting seals, and a self-aligning Super Ball Bushing bearing for accurate, low-friction linear motion. Maintenance teams and system integrators use this part for repair, retrofit, expansion, or replacement of precision linear guide systems.

Applications:

The Thomson TWN8 is designed for end-supported shaft applications requiring high load capacity, smooth linear travel, and precise positioning. Its twin pillow block construction increases rigidity while the self-aligning bearing compensates for minor shaft misalignment to ensure reliable operation. It is widely used in CNC machinery, robotics, packaging systems, semiconductor equipment, inspection machinery, medical equipment, and OEM automation systems.

Technical Specifications:

• Manufacturer: Thomson Industries
• Manufacturer Part Number (MPN): TWN8
• Product Type: Super Ball Bushing Twin Pillow Block Bearing
• Series: Super Ball Bushing®
• Bearing Style: Closed
• 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 (1/2 in / 12.70 mm)
• Compatible Shaft Class: Class L Round Shaft
• Overall Length (B): 3.500 in (88.90 mm)
• Overall Width (A): 2.000 in (50.80 mm)
• Body Width (A2): 1.380 in (35.05 mm)
• Overall Height (H1): 1.250 in (31.75 mm)
• Body Height (F): 1.130 in (28.70 mm)
• Centerline Height (G): 0.590 in (14.99 mm)
• Centerline Height (H): 0.687 in (17.45 mm)
• Mounting Hole Centers (E2): 2.500 in (63.50 mm)
• Mounting Hole Diameter (N): 0.160 in (4.06 mm)
• Recommended Mounting Bolt: #6
• Lubrication Port: Alemite 1877 Oil Fitting
• Dynamic Load Capacity: 510 lbf (2,268.6 N)
• Maximum Operating Temperature: 185°F (85°C)
• Weight: 0.40 lb (0.181 kg)
• Self-Aligning: Yes
• Adjustable: No
• Seals: Integral Double-Acting Seals
• Roll Pack: No
• Food Grade Rated: No
• Corrosion Resistance: Standard (Not Corrosion Resistant)
• Features: Twin bearing construction, self-aligning bearing plates, lightweight aluminum housing, engineered polymer retainers, low-friction operation, reduced operating noise, lubrication access, and long service life. 

Common Replacements:

• Thomson TWN8ADJ
• Thomson TWN8OPN
• Thomson TWN8-CRLL