Screw-to-connect Quick Couplings
Most quick-release couplings are available in ball lock construction. because it is much easier and faster to operate. But many high-pressure hydraulic quick couplings, or couplings that are subject to large vibrations, are threaded connect coupling. For example, quick couplings on jacks and hydraulic breakers.
HSC Series
Heavy duty screw connect couplers Holmbury Roflex 5000 DNP PVR Series
SP Series
High pressure screw connect couplers