Thomson TWN8OPN Super Ball Bushing Twin Open Pillow Block Bearing

Description:

The Thomson TWN8OPN Super Ball Bushing Twin Open Pillow Block Bearing is used in precision linear motion systems with continuously supported 1/2-inch (0.500-inch) Class L round shafts. Commonly installed in CNC machines, robotics, packaging equipment, automated assembly systems, and material handling equipment, this open-type twin pillow block features a lightweight aluminum housing, adjustable self-aligning Super Ball Bushing bearings, and integral double-acting seals for smooth, 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, accurate positioning, and reliable linear guidance. Its twin pillow block construction provides greater stability than a single bearing while the open design allows installation on supported shafts. The adjustable, self-aligning bearing design compensates for minor shaft misalignment, making it ideal for CNC machinery, robotics, semiconductor equipment, packaging systems, automated inspection equipment, and OEM linear motion assemblies.

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)
• Body Width (A2): 0.750 in (19.05 mm)
• Overall Height (H1): 1.130 in (28.70 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)
• Recommended Mounting Bolt: #6
• Dynamic Load Capacity: 460 lbf (2,046 N)
• Maximum Travel Speed: 10 ft/sec (3.0 m/s)
• Maximum Operating Temperature: 185°F (85°C)
• Weight: 0.40 lb (0.181 kg)
• Number of Ball Circuits: 4
• Self-Aligning: Yes
• Adjustable: Yes
• Lubrication Access: Oil Lubricant Fitting (1/8" Alemite 1877)
• Seals: Integral Double-Acting Seals (standard version)
• Food Grade Rated: No
• Roll Pack: No
• Corrosion Resistance: Standard (Not Corrosion Resistant)
• Features: Open design for continuously supported shafts, twin pillow block construction, adjustable fit, self-aligning bearing plates, lightweight aluminum housing, engineered polymer retainers, low-friction operation, reduced noise, and extended service life. 

Common Replacements:

• Thomson TWN8OPN-DP
• Thomson TWN8OPN-LS
• Thomson TWN8OPN-CR