HFL - Single Acting Low Height Failsafe Lock Ring CylindersCapacities from 55 to 573 tons. Stroke lengths from 1. 77 to 2. 01 inches. Working pressure 10,000 psi. Single acting, load return. Mechanical lock ring feature allows for load holding for extended periods. Compact, low height design suitable for vertical lifting applications only. Threaded piston with tilting saddle fitted as standard to reduce the risk of side loading. Nitrocarburized cylinder body and piston rod for increased corrosion protection.