Model : WPFR50V Series : WPF Product Lines : Workholding Tools Double acting Collet-Lok® action allows fully automated operation Additional level of safety since live hydraulics are not required to maintain clamping force Collet-Lok® swing cylinders can be mounted by the flange or threaded into the fixture. Flanged models have manifold ports and tubing ports. Viton seals are standard Think Safety Manufacturer’s rating of load and stroke are maximum safe limits. Good practice encourages using only 80% of these ratings! Pump Selection A double-acting cylinder must be powered by a pump with a 4-way valve.