The 640 series double acting hydraulic cylinders are manufactured in 210mm. of race, always being in stock. This series of hydraulic top links consists of a 30 mm diameter stem. up to 40 mm. in quality Ck45 (F114) and a St52.3 lapped tube, diameter from 50x60 to 80x95 and with internal tolerance of h9. As a mooring, it has a Cat2 or Cat3 quick coupling at the tip of the stem and an adjustable threaded ball joint, which can be interchanged with a threaded American joint on the back. It comes with a non-return valve incorporated in all its series.