THK HSR55 Recirculating Ball Linear Guide Bearing Block

The THK HSR55 Recirculating Ball Linear Guide Bearing Block pairs with THK HSR55 rails to deliver high-rigidity, precise 55 mm linear motion in heavy‑duty automation. Its four‑row recirculating ball design and four‑way equal-load capability provide consistent performance under radial, reverse radial, and lateral loads, making it a reliable choice for demanding environments. Compatible with 55 mm rails, the block features a 53 mm rail width, 44 mm rail height, and 120 mm mounting hole pitch, with available block types including R, LR, CA, CB, HA, HB, YR; dynamic load rating for the HSR55CA variant is 121 kN and static load rating is 146 kN, built from hardened bearing steel and usable with grease or oil lubrication, with an optional QZ long-term lubricator and standard seals UU and SS. Commonly used in CNC machining centers, gantry systems, robotic automation, semiconductor production equipment, packaging machinery, and heavy material handling, the bearing block is suited for maintenance teams, OEM machine builders, and system integrators performing repair, retrofit, expansion, or replacement.