Specialist tubing

Stainless Steel Instrumentation Tubing

Enquire for stainless instrumentation tubing. Specify grade, OD, wall, tolerance, surface finish and delivery location.

Technical reference

Specifications and ordering data

Specification

Field	Order reference
Standard	A269 for general service where the project specifies it
Product or route	Straight or coiled tube for the approved fitting series
Critical dimensions and fit	Keep inch and metric ODs separate and confirm fitting-compatible wall and condition
Supply enquiry	Confirm sizes, lengths, route, documentation and lead time for your order

Dimensions and weight

Illustrative drawing sizes. The bore and mass are calculated from the nominal dimensions. Use the project tolerance and confirm the size and route in the quote.

Tube OD (mm)	Wall (mm)	Nominal bore (mm)	Estimated kg/m at 8,000 kg/m³
6	1	4.00	0.13
6.35	0.89	4.57	0.12
12	1.5	9.00	0.40

Service and pressure basis

Use the approved design code and service conditions. The applicable rating depends on material, temperature, minimum effective wall, joint details and the limits of the connected assembly. A schedule or a hydrostatic test result alone cannot establish an operating pressure.

Reference ASME process piping code B31.3

Chemical composition

The grade on the purchase line controls chemistry. Specify the grade with the finished product standard or drawing.

Check	What to match
Grade and specification	TP or UNS on the quotation and material report
Heat analysis	Full limits and any stabilising or alloy additions under the ordered edition

Reference ASTM steel standards

Mechanical properties

Use the ordered grade, delivery condition and product standard to review the actual tensile, yield, elongation or hardness results required by the order.

Check	What to verify
Condition	Heat treatment or cold-work condition stated for the offered form
Acceptance	Project-specified dimensions and relevant test records

Reference ASTM steel standards

Testing and certificates

Check the required OD tolerance, ovality, hardness and cleanliness evidence.

When	What to check
Before ordering	Document the required test method, edition and any witness points
At delivery	Match the material report and heat or lot identification to the shipment

Application and product comparison

6 mm and ¼ in fittings use different tube ODs.

For the enquiry, keep inch and metric ODs separate and confirm fitting-compatible wall and condition.

Example request for quotation

A269 for general service where the project specifies it · 6 × 1 mm. Add quantity, lengths, delivery city and the required reports.

Request a quote

Ordering guidance

Make tubing dimensions match the specified connection

Send actual OD, wall thickness and units. Include the product standard, grade, manufacturing route, tolerance and surface requirements shown on the drawing. Nominal pipe size is not a substitute for actual tube OD.

When the tubing must fit an existing connection, identify its drawing or fitting series and any documented requirements. Ask the project team to confirm the combination rather than assuming every tube of the same OD fits every application.

Check pricing and availability →

Illustration: Small-bore stainless tubes and a continuous coil

Buyer’s guide

Instrument tubing for compression fittings and panel routing

Match the fitting series to the actual OD

Compression fittings are selected for the specified tube OD, which may be inch or metric. A 6 mm tube and a ¼-inch tube have different outside diameters. Copy the unit system from the fitting schedule and confirm the permitted wall, hardness and tube condition with the fitting manufacturer or approved project specification.

Choose straight lengths or continuous coils by route

For a panel, straight lengths may suit repeated short bends and neat routing. For a long run, state the minimum continuous coil length and whether joints are allowed. Send a take-off by size and length with any requirements for cleaning, capped ends, protective packing or marking by instrument tag.

Specify the examination and dimensional evidence

Use the nominated tube standard and grade, such as A269 where the project specifies it. If wall tolerance, ovality, surface condition or hardness matters at the joint, attach the acceptance criteria. Request documentation against the actual tube size rather than a certificate that covers the alloy family generally.

Example enquiry

For a panel build, identify the fitting system, exact OD, wall, grade and cut schedule for each line. Put metric and inch tubing on separate rows and ask that bundles be identified accordingly.

Can the tube wall be chosen independently of the fitting?

Check the permitted wall range, tube condition and pressure basis in the fitting documentation and project design.

Technical references ASTM A269/A269M scope · ASTM steel standards directory

Prepare your enquiry

What to put on the purchase list

Item	What to send
Product details	OD × wall · grade · standard · tolerance · finish · connection reference
Delivery	Quantity with units, delivery city and required date if known
Acceptance	Required certificates and inspection scope; attach the drawing revision where applicable

What if the instrument line uses inch OD tubing?

Keep the OD and wall units explicit in the RFQ and check the fitting documentation before converting to metric dimensions.

Technical reference: ASTM steel standards catalogue

Continue your product search

Back to the Pipe & Tube Product Catalogue

Project enquiries

Request pricing and availability

Send your dimensions, quantities and delivery city. Include any inspection or material certificate requirements so they can be quoted against the same line items.

Request a quote → Call +91 99204 92715