The AMLOK® Hydraulic Series RCH rod clamp provides power-off clamping of rods and shafts. The clamps are actuated by a spring/collet mechanism and unclamped by hydraulic pressure. They can clamp components after the motion has stopped and hold the position securely as long as the forces do not exceed the table values. The mountings apply to standard heavy-duty NFPA-style MF1 cylinders. The clamps are designed for locking reciprocating motions only, but special units are also available for both rotating and reciprocating motions.