THK Co., Ltd. HSR55R1SS Ball Bearing Carriage

Description:

The THK HSR55R1SS (GK) Linear Rail Bearing Block is a standard-width recirculating ball linear bearing block designed for use with THK HSR55 series linear guide rails in heavy-duty, high-precision motion systems. The R-type block features a compact top-mount design with SS sealing for enhanced contamination protection, delivering smooth linear travel, four-way equal load capability, high rigidity, and excellent positioning accuracy. Commonly installed in CNC machining centers, industrial robots, semiconductor manufacturing equipment, automated production lines, and material handling systems, this bearing block is used by maintenance teams, OEM machine builders, and system integrators for equipment repair, retrofit, expansion, and replacement.

Applications:

The THK HSR55R1SS (GK) is widely used in CNC milling machines, machining centers, gantry automation systems, robotic transfer equipment, semiconductor manufacturing machinery, packaging equipment, precision measuring systems, and heavy-duty industrial automation. Its compact top-mount configuration provides excellent rigidity, high load capacity, and reliable linear motion where precise positioning and long service life are required.

Technical Specifications:

• Manufacturer Part Number (MPN): HSR55R1SS (GK)
• Manufacturer: THK Ltd.
• Product Type: Linear Motion Guide Bearing Block
• Series: HSR Global Standard LM Guide (GK Series)
• Block Type: R (Standard Top-Mount Type)
• Guide Type: Four-Row Recirculating Ball Linear Motion Guide
• Compatible Rail Size: 55 mm
• Overall Height (M): 80 mm
• Block Width (W): 100 mm
• Overall Length (L): 163 mm (162.9 mm nominal)
• Mounting Hole Spacing (B × C): 75 × 75 mm
• Mounting Thread: M12 × 18 mm
• Compatible Rail Width: 53 mm
• Rail Height: 44 mm
• Rail Mounting Hole Pitch: 120 mm
• Basic Dynamic Load Rating: 121 kN
• Basic Static Load Rating: 146 kN
• Grease Nipple: B-PT1/8
• Block Weight: Approximately 4.3–4.5 kg
• Material: Hardened Bearing Steel
• Seal Type: SS (End Seal + Side Seal + Inner Seal)
• Lubrication: AFB-LF Grease (Factory Filled)
• Features: Four-way equal load design, self-aligning capability, precision-ground raceways, high rigidity, low-friction operation, interchangeable GK components, and long service life.

Common Replacements:

• THK HSR55R1UU (GK)
• THK HSR55LR1SS (GK)
• THK HSR55XR1SS (GK)