THK SR20-TBSS Four Row Linear Bearing Block Carriage

Description:

The THK SR20-TBSS Linear Bearing Block Carriage is a four-row radial-type flange linear guide block designed for use with THK SR20 linear guide rails, delivering smooth, high-rigidity, and low-friction linear motion in demanding industrial applications. Commonly installed in CNC machine tools, semiconductor manufacturing equipment, robotics, packaging machinery, precision inspection systems, and automated production equipment. Maintenance teams and system integrators use this bearing block for OEM replacement, machine repair, retrofit projects, and the construction of precision linear motion systems.

Applications:

The THK SR20-TBSS is engineered for precision motion systems requiring high load capacity and excellent moment rigidity. Its four-row ball raceway design provides equal load support in all directions, making it ideal for factory automation equipment, pick-and-place systems, electronic assembly machines, medical devices, optical inspection equipment, material handling systems, and other applications requiring accurate, reliable linear guidance.

Technical Specifications:

• Manufacturer: THK
• Part Number: SR20-TBSS
• Product Type: Linear Bearing Block Carriage
• Series: SR20 Full-Ball LM Guide
• Guide Type: Radial Type Linear Motion Guide
• Block Style: TB (Long Flange Type)
• Bearing Design: Four-Row Ball Raceway
• Compatible Rail Size: SR20
• Overall Height (M): 28 mm
• Overall Width (W): 59 mm
• Overall Length (L): 66.2 mm
• LM Block Width (B): 49 mm
• Mounting Hole Spacing (C): 32 mm
• LM Block Length (L1): 46.7 mm
• Mounting Thread Size (T): M8
• Grease Nipple: B-M6F
• Seal Configuration: SS (End Seals)
• Preload: Standard (unless otherwise specified)
• Accuracy Grade: Normal (unless otherwise specified)
• Material: Hardened Bearing Steel
• Lubrication: Grease or Oil Lubrication
• Operating Temperature: -20°C to 80°C
• Features: Four-row equal-load ball raceway, long flange mounting design, high rigidity, smooth low-friction operation, high positioning accuracy, relubrication through grease nipple, excellent wear resistance, and long service life.

Common Replacements:

• THK SR20TBUU Linear Bearing Block
• THK SR20SBSS Linear Bearing Block
• THK SR20TBMSS Linear Bearing Block