Swagelok® Medium-Pressure Tube Fittings (FK Series)
Swagelok FK series medium-pressure fittings have improved fluid connections in tough applications like oil and gas exploration, R&D systems, and the hydrogen market. They offer reliable, leak-tight connections for advanced systems in fluid handling and gas sealing applications.
View All Medium Pressure Tube FittingsSwagelok® FK series medium-pressure fittings install up to five times faster than cone and thread fittings, reducing installation time, assembly, and maintenance costs. The fittings are vibration-resistant and offer a leak-tight gas seal for applications up to 20 000 psig (1378 bar). Ideal for use in challenging environments where secure, high-pressure connections are critical.
These medium pressure fittings are reliable and efficient, offering robust performance in severe applications while protecting workers and the environment. They meet EC-79 standards for hydrogen applications up to 700 bar (10 150 psig) and feature a preassembled cartridge for easy, accurate installation. The simple two-piece design, with color-coded ferrules, ensures proper orientation and installation using standard tools. The strain-hardened 316 stainless steel body provides a lightweight, space-saving solution. FK series fittings are also available in NACE MR0175/ISO 15156 compliant versions.
Medium-Pressure Tube Fitting Categories
Bulkheads
Make reliable fluid transfers with a bulkhead designed specifically for passing a tubing connection through a panel or steel partition.
Caps and Plugs
Pressurize the fluid system by capping medium-pressure connections or plugging ports.
Female Connectors
Create a secure connection with female connectors for tube fittings, designed to receive and hold male connectors.
Male Connectors
Construct a leak-free connection in process instrumentation and industrial applications with a male connector for medium-pressure tube fittings.
Spare Parts and Accessories
Nut and ferrule sets and medium-pressure gap inspection gauges for tube fittings.
Unions
Combine tubing easily with an elbow, tee, or straight union, available in 316 stainless steel for medium-pressure tube fittings.
Medium-Pressure Tube Fittings Catalogs
The strain-hardened 316 stainless steel FK fitting bodies are available in straight, elbow, and tee shapes to meet your configuration needs in a lightweight, space-saving design. Find detailed product information, including materials of construction, pressure and temperature ratings, options, accessories, and installation instructions in the product literature provided here.
FK and IPT Series Products Cone and thread or medium-pressure tube fitting connections Excellent corrosion resistance in chloride-containing environmentsManufactured to meet NORSOK and NACE® MR0175/ISO15156
Swagelok® offers medium- and high-pressure fittings, tubing, valves, and related accessories with temperatures up 1000°F (537°C), pressure ratings up to 60 000 psig (4134 bar) in sizes ranging from 1/4 to to 1 in. for medium-pressure products and 1/4 to 9/16 in. for high-pressure products. NACE® MR0175/ISO15156 compliance is available.
Tube Fittings Comparison (FK Series)
Watch and compare installation of FK series and cone and thread fittings.
Compare the FittingsSwagelok Resources Curated for You
AGI Industries
Read how Swagelok helped AGI Industries achieve leak-free performance at 15 000 psi for 13 500 potential leak points with Swagelok FK series valves and fittings.
Optimizing Component Selection for Hydrogen Fuel Cell Vehicles
Hydrogen transportation depends on reliable component specification and selection.
Case Study: Offshore Oil Operator
Read how Swagelok helped an offshore oil operator reduce installation labor time and enhance overall performance by changing existing cone and thread connections with Swagelok's FK series fittings.
Empa and Swagelok’s Collaborative Research Fuels Development of Hydrogen Transportation Innovations
The Swiss Federal Laboratories for Materials Science and Technology (Empa) and Swagelok are exploring the viability of hydrogen-based transportation solutions. One recent research breakthrough stemming from our collaboration incorporated Swagelok’s FK series fittings within the Empa hydrogen solution. Using FK series fittings instead of traditional Swagelok tube fittings significantly eased installation, while improving leak-tightness, reliability, and safety.
FK Series Medium-Pressure Tube Fittings
From initial construction and commissioning through daily operations and maintenance, there is a tremendous focus on reducing total lifecycle costs. FK series tube fittings can reduce maintenance costs and provide high reliability, reducing system downtime, when proper assembly processes are followed. These fittings can also help mitigate environmental impact via leak reduction as well as improve overall safety by protecting your system against corrosion.
Read about how to build more productive critical fluid systems with FK series fittings