Thomson TWN12ADJ Super Ball Bushing Bearing Twin Pillow Block

Description:

The Thomson TWN12ADJ Super Ball Bushing Twin Adjustable Pillow Block Bearing is used in precision linear motion systems to provide smooth, self-aligning linear travel on 3/4-inch (0.750-inch) Class L round shafts. Commonly installed in CNC machines, robotics, packaging equipment, automated assembly systems, semiconductor equipment, and industrial automation machinery, this closed-type twin pillow block features an adjustable aluminum housing, integral double-acting seals, and a self-aligning Super Ball Bushing bearing for precise, 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 TWN12ADJ is designed for end-supported shaft applications requiring adjustable bearing preload, high load capacity, and precise positioning. Its twin pillow block configuration provides greater rigidity than a single bearing, while the adjustable housing allows precise diametrical fit-up for improved accuracy and repeatability. It is widely used in CNC machinery, packaging systems, robotics, semiconductor manufacturing equipment, inspection machines, material handling systems, and OEM linear motion assemblies.

Technical Specifications:

• Manufacturer: Thomson Industries
• Manufacturer Part Number (MPN): TWN12ADJ
• Product Type: Super Ball Bushing Twin Adjustable Pillow Block Bearing
• Series: Super Ball Bushing®
• Bearing Style: Closed
• Pillow Block Type: Twin Adjustable
• Bearing Configuration: Twin Linear Bearing
• Housing Material: Aluminum
• Bearing Material: Hardened Steel with Engineered Polymer Retainers
• Nominal Bore (ID): 0.750 in (19.05 mm)
• Compatible Shaft Class: Class L Round Shaft
• Overall Length (B): 4.500 in (114.30 mm)
• Overall Width (A): 2.750 in (69.85 mm)
• Body Width (A2): 1.880 in (47.75 mm)
• Overall Height (H1): 1.750 in (44.45 mm)
• Body Height (F): 1.560 in (39.62 mm)
• Centerline Height (G): 0.940 in (23.88 mm)
• Centerline Height (H): 0.937 in (23.80 mm)
• Mounting Hole Centers (E2): 3.500 in (88.90 mm)
• Mounting Hole Diameter (N): 0.190 in (4.83 mm)
• Recommended Mounting Bolt: #8
• Lubrication Port: 1/4-28 Thread
• Dynamic Load Capacity: 1,200 lbf (5,338 N)
• Maximum Travel Speed: 10 ft/sec (3.0 m/s)
• Maximum Operating Temperature: 185°F (85°C)
• Weight: 1.20 lb (0.544 kg)
• Self-Aligning: Yes
• Adjustable: Yes
• Seals: Integral Double-Acting Seals
• Roll Pack: No
• Food Grade Rated: No
• Corrosion Resistance: Standard (Not Corrosion Resistant)
• Features: Adjustable pillow block for precise bearing preload, twin bearing construction, self-aligning bearing plates, lightweight aluminum housing, engineered polymer retainers, lubrication access, low-friction operation, reduced operating noise, and extended service life. 

Common Replacements:

• Thomson TWN12
• Thomson TWN12OPN
• Thomson TWN12ADJ-CRDP