THK Co., Ltd. HSR55R1SS Ball Bearing Carriage

The THK HSR55R1SS (GK) Ball Bearing Carriage is a standard-width, four-row recirculating ball linear bearing block designed for use with THK HSR55 series rails in heavy-duty, high-precision motion systems. The R-type block features a compact top-mount design with SS seals (end, side, and inner) for enhanced contamination protection, delivering smooth linear travel, four-way equal-load capability, high rigidity, and long service life. Key specifications include MPN HSR55R1SS (GK); Series HSR Global Standard LM Guide (GK Series); block width 100 mm, overall height 80 mm, and overall length 163 mm (162.9 mm nominal); mounting hole spacing 75 × 75 mm; mounting thread M12 × 18 mm; compatible rail width 53 mm and rail height 44 mm; basic dynamic load rating 121 kN and basic static load rating 146 kN; grease nipple B-PT1/8; weight about 4.3–4.5 kg; material hardened bearing steel; lubrication with factory-filled AFB-LF grease. This bearing block supports precise positioning and reliable motion in CNC milling machines, machining centers, gantry automation systems, robotic transfer equipment, semiconductor manufacturing machinery, packaging lines, and precision measuring systems, and is commonly specified by maintenance teams, OEM machine builders, and system integrators for equipment repair, retrofit, expansion, and replacement.