Tubing Size Chart: OD, ID and Working Pressure by Model

This tubing size chart lists every standard pneumatic tubing size and the tubing dimensions we manufacture, with model, outside diameter, inside diameter, wall thickness, working pressure and minimum bend radius for all eight material families. All figures come from our own published model tables — nothing here is generic industry data.

How to read the chart

Tubing is specified by outside diameter and inside diameter; the wall is the half-difference of the two, shown here rounded to two decimals. Fittings accept one specific OD-and-wall combination, so match the chart to the fitting seat rather than to a nominal name — the size and wall thickness guide explains the conventions and includes a worked example.

Working pressures are the published ratings for each model. They hold at the stated reference temperature; the working pressure and temperature review covers derating before you use them on a hot line.

PU Tubing sizes (15 models)

The standard polyurethane range: the tightest bend radii in the catalogue, rated 5–8 bar on metric sizes. Full details on the PU tubing page.

Polyether Tubing sizes (14 models)

The polyether-TPU grade: same sizes and codes as PU, higher metric pressure ratings, the default for humid service. Full details on the Polyether tubing page.

PA6 Nylon Tubing sizes (14 models)

General-purpose nylon: the highest pressure ratings in the range on most sizes, at the cost of larger bend radii. Full details on the PA6 Nylon tubing page.

PA12 Nylon Tubing sizes (14 models)

Low-moisture-absorption nylon for stable dimensions in wet service and high-pressure circuits. Full details on the PA12 Nylon tubing page.

PE Tubing sizes (14 models)

The economical polyethylene range for low-to-medium pressure air and water lines. Full details on the PE tubing page.

FEP Tubing sizes (14 models)

Fluoropolymer for chemical service and purity, transparent, rated 10–20 bar on metric sizes. Full details on the FEP tubing page.

PFA Tubing sizes (14 models)

The premium fluoropolymer grade for higher temperature and high-purity lines. Full details on the PFA tubing page.

High-Pressure Composite Tubing sizes (28 models)

Two-layer reinforced construction in two variants, rated 12–19 bar with hose-like flexibility at small sizes. Full details on the high-pressure composite tubing page.

V8 structure: PU outer layer + PA12 inner layer

V9 structure: polyether TPU outer layer + PA12 inner layer

Nylon tubing in inch sizes: 1/8, 1/4, 3/8 and 1/2

Searching by fractional size? Our nylon tubing is listed in inch sizes as well as metric. The inch rows follow the nominal outside diameter (1/8″ is 3.175 mm OD, 1/4″ is 6.35 mm, 3/8″ is 9.525 mm and 1/2″ is 12.70 mm) with a tolerance of ±0.10 mm, and working pressure is quoted at 23°C. PA6 and PA12 are different materials, so read each column for its own material and compare the two only at the same size. See the PA6 nylon tubing page and the PA12 nylon tubing page for the full model tables, data sheets and ordering details.

Reading the patterns

Three patterns repeat across the chart and are worth knowing before you pick a row. First, pressure falls as diameter grows within a family, because pressure stress scales with diameter relative to wall. Second, at the same size the ratings differ sharply by material — a 8 × 5 tube runs from 7 bar in PU to 29 bar in PA6. Third, the smallest sizes carry the highest ratings everywhere: the 1/8″ tubes reach 8–20 bar depending on family.

Same outside diameter, different bore: what changes

Two tubes can share an outside diameter and still deliver different circuits. The table below uses two hypothetical 8 mm tubes to show how the inside diameter drives the internal cross-section and the air volume the line holds.

Source: geometric calculation, internal area = π × ID² ÷ 4 and volume = area × length. The dimensions are illustrative and are not model ratings or measured flow results.

Tube B has about 44% more internal cross-sectional area, but that does not mean 44% more airflow or a proportional gain in cylinder speed. Valves, fittings, supply pressure, exhaust path and tube length all affect response, and a thinner wall needs its own working-pressure check against the rows above.

Length matters as much as bore. Three meters of 6 mm ID tubing hold about 84.8 mL, against 28.3 mL for one meter. On a line that fills and exhausts every cycle, avoidable length adds volume, so shorten the route before assuming a larger diameter is the fix. When you order a replacement, write the size as OD × ID with units, because “8 mm tube” leaves the bore open.

If your size is not in the chart

The chart lists standard production models. Custom inside and outside diameters, wall thicknesses and coil lengths are confirmed case by case: send the dimensions, quantity, medium, temperature range and working pressure through the quotation checklist and we will confirm the feasible model and lead time. The full ranges sit on the product overview, and the material-level trade-offs are on the industrial tubing materials page.

Next step. Pick the family that covers your pressure and medium, open its product page for burst pressures and datasheets, or send the five items from the quotation checklist for a confirmed offer.

Frequently Asked Questions: Tubing Sizes & Dimensions

To match a size to a fitting, see push-in fittings and tubing.

Related guides: pneumatic tubing guide · pneumatic tubing 6/4 and 8/6 mm · PU pipe and pneumatic pipe vs tubing.