Thomson SB12-1B (SB12) Shaft Support Block (End Support)

Description:

The Thomson SB12-1B (SB12) Shaft Support Block is used to securely support and position 0.750-inch precision linear shafting in linear motion systems. Commonly installed in CNC machines, automated assembly equipment, conveyor systems, packaging machinery, and industrial automation applications using Thomson 60 Case® linear shafts. Maintenance teams and system integrators use this shaft support block for machine repairs, shaft support replacement, equipment retrofits, and new linear motion installations requiring rigid shaft mounting.

Applications:

The Thomson SB12-1B (SB12) standard-profile shaft support block is designed to provide end or intermittent support for 3/4-inch linear shafts where shaft deflection is minimal. It is widely used in linear guide assemblies, material handling systems, inspection equipment, CNC machinery, factory automation, and custom OEM equipment. The support block clamps the shaft securely while simplifying shaft alignment and installation.

Technical Specifications:

• Manufacturer: Thomson Industries, Inc.
• Manufacturer Part Number (MPN): SB12-1B (SB12)
• Product Type: Shaft Support Block (End Support)
• Support Style: Standard Profile
• Nominal Shaft Diameter: 0.750 in (19.05 mm)
• Compatible Shafting: Thomson 60 Case® LinearRace® Shafting
• Material: Malleable Iron
• Finish: Painted / Corrosion-Resistant Coating
• Overall Length: 2.750 in (69.85 mm)
• Overall Height: 2.130 in (54.10 mm)
• Shaft Center Height: 1.250 in (31.75 mm)
• Mounting Hole Spacing: 2.000 in (50.80 mm)
• Mounting Hole Diameter: 0.220 in
• Mounting Bolt Size: #10
• Number of Mounting Holes: 2
• Weight: Approximately 0.50 lb (0.23 kg)
• Features: Standard-profile design, rigid shaft clamping, easy installation, supports end or intermittent shaft mounting, designed for light-load applications with minimal shaft deflection.

Common Replacements:

• Thomson SB12-XS
• Thomson ASB12
• Thomson FSB12