Thomson TWN12OPN Super Twin Pillow Block Ball Bearing Open Shaft 0.75 3/4

Description:

The Thomson TWN12OPN Super Ball Bushing Twin Open Pillow Block Bearing is used in precision linear motion systems with continuously supported 3/4-inch (0.750-inch) Class L round shafts. Commonly installed in CNC machines, robotics, packaging equipment, automated assembly systems, semiconductor equipment, and material handling machinery, this open-type twin pillow block features a lightweight aluminum housing, adjustable self-aligning Super Ball Bushing bearings, and an open design for smooth, accurate linear motion on supported shafts. Maintenance teams and system integrators use this part for repair, retrofit, expansion, or replacement of precision supported-shaft linear guide systems.

Applications:

The Thomson TWN12OPN is designed for continuously supported shaft applications where maximum rigidity, smooth travel, and accurate positioning are required. Its twin pillow block construction provides increased stability over single-bearing designs, while the self-aligning and adjustable bearing configuration compensates for shaft misalignment. It is widely used in CNC machinery, robotics, semiconductor manufacturing equipment, packaging systems, automated inspection equipment, material handling systems, and OEM linear motion assemblies.

Technical Specifications:

• Manufacturer: Thomson Industries
• Manufacturer Part Number (MPN): TWN12OPN
• 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 Alloy
• Bearing Material: Hardened Steel with Engineered Polymer Retainers
• Nominal Bore (ID): 0.750 in (19.05 mm)
• Compatible Shaft Class: Class L Continuously Supported Shaft
• Overall Length: 4.500 in (114.30 mm)
• Overall Width: 2.750 in (69.85 mm)
• Body Width: 1.940 in (49.28 mm)
• Overall Height: 1.560 in (39.62 mm)
• Centerline Height: 0.937 in (23.80 mm)
• Mounting Hole Centers: 3.500 in (88.90 mm)
• Mounting Hole Diameter: 0.190 in (4.83 mm)
• Recommended Bolt Size: #8 (M8 equivalent)
• Dynamic Load Capacity: 940 lbf (4,181 N)
• Maximum Travel Speed: 10 ft/sec (3.0 m/s)
• Maximum Operating Temperature: 185°F (85°C)
• Weight: 1.0 lb (0.45 kg)
• Self-Aligning: Yes
• Adjustable: Yes
• Number of Ball Circuits: 5
• Lubrication Access: 1/4-28 Lubrication Port
• Seals: Both Ends (standard version)
• Roll Pack: No
• Food Grade Rated: 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 TWN12OPN-DP
• Thomson TWN12OPN-CR
• Thomson TWN12OPN-LS