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Autoclave Engineers offers a complete selection of austenitic, cold drawn stainless steel tubing designed to match the performance standards of Autoclave valves and fittings. Autoclave medium pressure tubing is manufactured specifically for high pressure applications requiring both strength and corrosion resistance. The tubing is furnished in random lengths between 20 feet (6 meters) and 27 feet (8.2 meters). The average is 24 feet (7.3 meters). Medium Pressure Tubing is available in five sizes and a variety of materials.

Inspection and Testing
Autoclave Engineer’s high pressure tubing is inspected to assure freedom from seams, laps, fissures or other flaws, as well as carburization or intergranular carbide precipitation. The outside and inside diameters of the tubing are controlled within close tolerances. Sample pieces of tubing for each lot are tested to confirm mechanical properties. Hydrostatic testing is also performed on a statistical basis and is conducted at the working pressure of the tube. Autoclave will perform 100% hydrostatic testing at additional cost if desired.

Special Materials
In addition to the type 316 and 304 stainless steel tubing listed in this section, Autoclave has limited stock of hard-to-obtain shorter lengths of the following tubing materials: Monel 400*, Inconel 600*, Titanium Grade 2*, Nickel 200*, Hastelloy C276* - (* Trademark names)

Please consult factory for stock available.

Note: Caution should be exercised in proper selection of Medium Pressure Tubing based on actual operating conditions. Two series available: 15000 psi (1034 bar) and 20000 psi (1379 bar).

All dimensions for reference only and subject to change.
For prompt service, Autoclave stocks select products. Consult your local representative.
All general terms and conditions of sale, including limitations of our liability, apply to all products and services sold.

Medium Pressure Tubing Section

Unit of Measure

Tube Materials

N/A 316SS

Fits Connection Type


Outside Diameter Tube

N/A 9/16 in14.29 mm

Tolerance/Outside Diameter

N/A .557/.552 in14.15/14.02 mm

Inside Diameter Tube

N/A 0.312 in7.92 mm

Wall Thickness Tube

N/A 0.125 in3.18 mm

Flow Area

N/A 0.076 in²49.03 mm²

Working Pressure at -325 to 100°F (-198 to 37.8°C)

N/A 20000 psi1378.93 bar

Working Pressure at 200°F (93°C)

N/A 20000 psi1378.93 bar

Working Pressure at 400°F (204°C)

N/A 19250 psi1327.22 bar

Working Pressure 600°F (316°C)

N/A 18050 psi1244.48 bar

Working Pressure at 800°F (427°C)

N/A 16800 psi1158.30 bar