--- title: "How to Specify Tubing: A Specification Template with Examples" canonical: "https://yuannaitube.com/how-to-specify-tubing/" language: "en-US" --- RESOURCES # How to Specify Tubing: A Specification Template with Examples By [YUANNAI TUBE]() Published 2026-10-26Updated 2026-11-05 ![Three tube samples in a steel block with a caliper and a drawing sheet]() A tubing specification works when a supplier can quote it without a follow-up question. Write the product family and model, the ID × OD with tolerance, the length per roll and total quantity, the medium, the **working pressure** with its temperature, the color and marking, and the documents you need. This guide gives a copy-and-fill template and a worked example using real model rows. **Quick answer.** One line per item, always with units: *family and model · ID × OD (mm) · tolerance · roll length and quantity · medium · **working pressure** at a stated temperature · color and marking · documents*. Naming the model code is what turns a size into a specification. ## The specification block Use this block in an **inquiry**, a purchase order or a drawing note. The example column is a real model from the [PA6 model table]() . | Line | What to write | Example | | --- | --- | --- | | Family and model | Material family and the model code | PA6 nylon tubing, YN-PA6 0640 | | Size | ID × OD in the order shown, with units | 4.0 × 6.0 mm | | Tolerance | Tolerance as listed for the model | ±0.10 mm | | Length and quantity | Length per roll and total quantity | 200 m rolls, 2,000 m total | | Medium | What flows through the tube, including oil or additives | Dry compressed air | | Working pressure | Pressure with unit and the temperature it applies at | 35 bar (512 psi) at 23°C | | Temperature range | Lowest and highest ambient and medium temperature | −10°C to +60°C | | Routing | Fixed or moving, tightest bend | Fixed, 80 mm bend (model minimum 35 mm) | | Hardness (only if required) | Scale, value or range, and test standard | Shore A, range from the fitting maker’s chart, ASTM D2240 | | Color and marking | Color name and any marking or length print | Blue, standard marking | | Packaging and delivery | Reel or coil, destination, target date | Standard roll packing, port of destination, target date | | Documents | Data sheet, test reports or certificates required | Technical data sheet | The pressure, temperature and bend values in the example are inputs from the buyer; only the model, size, tolerance, roll length and 35 bar **working pressure** come from the table. Replace them with your own line conditions. ## One size, three specifications An 8 mm OD tube with a 6 mm ID exists in several materials, and the numbers differ. These three rows come straight from the model tables, all at 23°C: | Model | Material | Size (mm) | Working pressure | Burst pressure | Bend radius (mm) | | --- | --- | --- | --- | --- | --- | | [YN-PU 0860]() | PU | 6.0 × 8.0 | 5 bar (75 psi) | 15 bar (227 psi) | 25 | | [YN-PUR 0860]() | Polyether PU | 6.0 × 8.0 | 8 bar (116 psi) | 24 bar (348 psi) | 40 | | [YN-FEP 0860]() | FEP | 6.0 × 8.0 | 13 bar (182 psi) | 40 bar (580 psi) | 70 | The same size fits the same push-in fitting, yet the **working pressure** ranges from 5 to 13 bar and the **bend radius** from 25 to 70 mm. A line that says only “6 × 8 tube” leaves all three open; a line that names the model closes it. ## Write it this way - Write the **model code** and the material family, not just the tube type. - Write **ID × OD** with units; add the tolerance shown in the model row. - Write pressure with its **unit and temperature**, such as 35 bar at 23°C. - Write **working pressure** as the operating value and keep burst pressure as a separate figure. - Write the **color and marking** by name. - Write the **roll length and total quantity**. - List the **documents** you need with the order. - Write **hardness** only when a fitting or application requires it: the scale (for example Shore A), the value or range, and the test standard. Do not convert between Shore scales; see [tubing Shore hardness]() for the values on our data sheets. ## Where to find each value - Model code, size, tolerance, pressures and **bend radius**: the model table on each product page, or the [tubing size chart]() . - Temperature range and media: the technical data sheet on the [data sheet download page]() . - How ID, OD and **wall thickness** relate: [tubing ID, OD and wall thickness]() . - How pressure and temperature combine: [working pressure and temperature]() . - Static control or several channels in one piece: [antistatic PU tubing]() and [multi-lumen tubing]() are made to order, so write the resistance range and test method, or the number and size of channels, into the specification. - Comparing quotations once the specification is written: [how to choose a tubing supplier]() . ## Frequently Asked Questions: Writing a Tubing Specification Is tubing specified by ID or OD? Both, written as ID × OD. Push-in pneumatic fittings match the OD, so OD is the fit dimension; the ID sets flow. Model tables list both for every row. Do I need the model code if I already give the size? Yes. A size can exist in several materials with different pressure and bend values, as the 6.0 × 8.0 mm table above shows. The model code fixes the material and the ratings. What tolerance should I write? Write the tolerance shown in the model row of the table for your model, with its unit. Each row states it, so the specification and the data match. Should I specify Shore hardness? Only if your fitting or application calls for it. Shore A is read on a 0–100 scale under ASTM D2240, and readings on different Shore scales cannot be converted into each other. Hardness alone does not set how flexible a tube is, because **wall thickness** and construction also matter, so give the **bend radius** too. Fitting grip is best checked against the fitting maker’s tubing and fitting compatibility chart; for example, the [Parker Series U catalog]() lists 90–95 Shore A for its polyurethane tube and refers to such a chart. Which documents can I request with the specification? The technical data sheet for the family, and the **certificates** and reports published on the [certificates page]() . Name them in the specification so they ship with the order. **Next step.** Fill the template with your line conditions and send it through the [contact form]() ; the [inquiry checklist]() covers the remaining details. For non-standard sizes or colors, see [OEM and custom tubing]() . **Related guides:** [pneumatic tubing guide]() · [push-in fittings and tubing]() · [MOQ, lead time and samples]() · [what affects tubing price]() . ## Sources and scope - [PA6 Nylon Tubing — English data sheet (v4-20261020)]() - [PA12 Nylon Tubing — English data sheet (v5-20261020)]() - [Polyether Tubing — English data sheet (v2-20261020)]() - [FEP Tubing — English data sheet (v6-20261020)]() Use these documents for the identified product models and stated test conditions. General material comparisons and selection checklists do not establish a different grade’s rating, fitting compatibility or project approval. Confirm the exact model, medium, temperature, pressure and required evidence before ordering. Content review: [zhangkexin]() · Marketing Review scope: market information and document references. ## Tell us what your application needs. Send your dimensions, operating conditions and quantity. 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