FITOK two-ferrule tube fittings – 6 Series

FITOK 6D two-ferrule tube fittings

FITOK 6D two-ferrule fittings connect tubing in instrumentation, impulse lines and process systems handling gases and liquids. The range includes unions, elbows, tees, reducers, bulkhead fittings and threaded connectors. Component design and machining support assembly and subsequent maintenance of the connection.

Design features

• Metric and fractional sizes: catalogue sizes from 2 to 50 mm and from 1/16″ to 2″ allow selection for the tubing used.
• Materials and configurations: choose a configuration for the fluid, connections and required piping arrangement.
• Precision-machined components: support correct deformation of the ferrules and tubing during assembly to form a reliable connection.
• Rolled threads with a work-hardened, smooth surface: thread rolling strengthens the thread material through cold forming and produces a smooth finish. These threads reduce galling during tightening and help extend fitting service life.
• Silver-plated internal nut threads: reduce friction against the body threads and support tightening.
• Smooth elbow flow path: radiused internal junctions guide the fluid through changes in direction.
• Material traceability: fittings are identified by size, material and heat number.
• Disconnection and reassembly: connections can be taken apart for maintenance and retightened following FITOK assembly instructions.

Typical applications

Instrumentation and impulse lines, analyser connections, sampling systems and industrial gas and liquid installations.

Selecting the configuration

Specify tubing outside diameter, wall thickness and material, fluid, operating pressure, temperature and connections. Allowable pressure depends on the tubing and the lowest-rated connection; seals may also limit the temperature range.

Selected configurations with SilcoNert 2000 coating are available for analytical lines. The coated 6D fittings catalogue specifies body coating. For hydrogen applications, configurations with the H2 ordering code are normally used. EC-79 configurations are selected only when certification under that regulation is required. The catalogue lists selected EC-79 configurations in sizes 1/8″–5/8″ and 3–16 mm; we will confirm availability and applicable documentation for the requested product. Download the FITOK catalogue for hydrogen applications (PDF, EN).

FITOK installation video

Watch the installation of FITOK tube fittings up to 1 inch. Follow the installation instructions provided by the manufacturer for the specific fitting and tubing used.