HGH-25-HA-ZOC / ZAH is a heavy-duty linear guide block from the HIWIN HG series (size 25), designed for precise and smooth linear motion in CNC machines and industrial automation systems. It features a square-type (H) design with high load capacity and rigidity, making it suitable for demanding applications. The block is mounted from the top (A type) and uses a ball-type rolling mechanism for accurate movement. The ZOC (Z0) version provides light preload for smoother motion, while the ZAH (ZA) version offers medium preload for higher stiffness and precision.