The Duolok® range of stainless steel tube fittings are two-ferrule design delivering leak-tight tube fitting performance that can have a significant impact on quality, productivity and cost. These high performance tube fittings have been designed to intermix and interchange with Swagelok® fittings component-by-component.

The Duolok® tube fitting design from First Hose comprises four precision-machined components: body, front ferrule, back ferrule and nut. When assembled, the double ferrule design has a staged, sequential swaging action, which compensates for the variation in tubing materials, including the hardness and thickness of the tube wall to provide leak-tight connections.

Duolok Specifications

Types Two-ferrule compression fitting
Sizes Fractional: 1/16 to 2 in
Metric: 3 to 50 mm
MAWP 12,000 psig (825 bar)
@ 100° F (38° C)
Range -325° F to 1200° F
(-198° to 648° C)
Materials Stainless steel, carbon steel, brass, alloy 400, and UNS10276. Other materials are available on request.
Adapter Connections NPT thread, BSP threaded, SAE threaded, AN fittings, tube and pipe socket weld, port connectors, tube stubs.
Configurations Connectors, adapters, elbows, tees, crosses, caps, plugs
Special Fittings Bored-through, dielectric, calibration, bulkhead, tube inserts

Please contact our sales office for further advice.