Tubing & accessories

Tube that
bends true.

Seamless instrumentation tubing, fully annealed and drawn to a hardness that takes a bend without cracking and a ferrule without galling. Straight lengths, coil, and medium- to high-pressure series to 60,000 psi.

Send your BOM Jump to sizes↓

Bundle of seamless stainless steel instrumentation tubing, capped — Seamless · fully annealed · capped both ends

Outside diameter: 1/16 – 2 in
Metric OD: 2 – 50 mm
Wall thickness: 0.5 – 6 mm
Random length: 6 m std

The series

Four pressure
classes.

The same steel and the same anneal throughout — what changes between series is wall, tolerance band and the surface the sealing cone has to work against.

Series 01 · Standard instrumentation

Seamless straight length

The workhorse. Cold drawn, bright annealed and pickled, supplied in 6 m random lengths with both ends capped. Hardness is held below 80 HRB specifically so a twin-ferrule fitting can bite into it without work-hardening the seat.

Standard: ASTM A269 / A213
Condition: Fully annealed
Hardness: ≤ 80 HRB
Surface: Bright annealed

Series 02 · Medium pressure

T15 — 15,000 psi

Heavier wall on the same outside diameters, cold worked for strength and supplied with a certified burst margin. Takes a coned-and-threaded end connection rather than a ferrule, so the tube itself carries the seal.

Working pressure: 15,000 psi
Connection: Cone & thread
Condition: Cold worked
Test: Hydro, 100%

Series 03 · High pressure, imperial

T20P — 20,000 psi

Autofrettage-grade wall for hydraulic power units, chemical injection and test rigs. Bore is honed rather than left as drawn, which is what keeps the fatigue life up under repeated pressure cycling.

Working pressure: 20,000 psi
Sizes: 1/4 – 1 in
Bore: Honed
Ends: Coned & threaded

Series 04 · Ultra high pressure

T60H — 60,000 psi

Waterjet, subsea control and research duty. Every length is pressure tested and traceable to a single heat, and the certificate carries the actual test figure rather than a statement of compliance.

Working pressure: 60,000 psi
Sizes: 1/4 – 9/16 in
Traceability: Single heat
Certificate: EN 10204 3.1

Sizes

Pick a wall.

Working pressures below are for annealed 316/316L seamless tube at ambient temperature, calculated to ASTM A269. Derate for temperature, and read the datasheet before you release a drawing.

Indicative figures for quotation. The order acknowledgement carries the governing values.
Tube OD	Wall	Metric equivalent	Working pressure	Min. bend radius
1/8 in	0.028 in	3.18 × 0.71 mm	8,500 psi	10 mm
1/4 in	0.035 in	6.35 × 0.89 mm	5,100 psi	16 mm
1/4 in	0.049 in	6.35 × 1.24 mm	7,500 psi	16 mm
3/8 in	0.035 in	9.53 × 0.89 mm	3,300 psi	24 mm
3/8 in	0.049 in	9.53 × 1.24 mm	4,800 psi	24 mm
1/2 in	0.049 in	12.7 × 1.24 mm	3,700 psi	38 mm
1/2 in	0.065 in	12.7 × 1.65 mm	5,100 psi	38 mm
3/4 in	0.065 in	19.05 × 1.65 mm	3,300 psi	57 mm
1 in	0.083 in	25.4 × 2.11 mm	3,100 psi	76 mm

Grades

316 / 316L304 / 304L321904L Duplex 2205Super duplex 2507Alloy 625Alloy 825 Monel 400Titanium Gr 2

Finish & supply

Bright annealedPickled & passivatedElectropolished Straight length 6 mCoil to 300 mBoth ends capped

Accessories

What goes
on the ends.

Order the tube and the terminations on one line and they arrive matched — same heat family, same hardness relationship, no gap-gauge surprises on site.

Twin-ferrule tube union — **Twin-ferrule fittings** Unions, elbows, tees and reducers sized to the tube on the same order line.

Reducing union — **Reducers & adapters** Step between imperial and metric runs without an intermediate bulkhead.

Three-valve instrument manifold — **Manifolds & blocks** Two, three and five-valve bodies to land the run straight onto a transmitter.

Ordering

Give us
the run.

Size, wall, grade, length and the pressure you are working at. If you have a bill of materials in a spreadsheet, send it as it is — competitor part numbers are fine.

Send your BOM See the grades on the part→