Standards · Standards worlds
Pipe and fitting standards worldwide
A pipe to EN is ordered with outside diameter and wall thickness in millimetres, one to ASME with NPS and schedule, one to JIS with A size and Sch. For each standards world this page shows which standard sets the dimensions, which the delivery conditions, how size and wall thickness are stated, whether it fits EN and where to continue with us. It is a signpost, not a dimension table.
- Pipes
- 6 standards worlds
- Fittings
- 6 standards worlds
- Dimensions
- only on our dimension pages, with source
Pipe standards by standards world
| Standards world | Standard | Size | Wall thickness | vs EN | With us |
|---|---|---|---|---|---|
| Europe | EN 10220 (dimensions) · EN 10216-x, EN 10217-x, EN 10255, EN 10305-x (technical delivery conditions) formerly/alongside: DIN 2448, DIN 2458, DIN 1629, DIN 1630, DIN 2440, DIN 2441 | DN · outside diameter | T in mm, series | fits | Dimension standard and delivery condition are two standards - our pipe pages per world show both. |
| USA | ASME B36.10M (steel) · ASME B36.19M (stainless steel) formerly/alongside: ANSI B36.10, B36.19 | NPS | schedule (Sch 5S to XXS) | does not fit | Schedule is not a wall thickness - the mm value depends on the size. Our pages show both. |
| Japan | JIS G 3452 · JIS G 3454 · JIS G 3456 · JIS G 3459 | A (mm) · B (inch) | Sch (JIS schedule) | does not fit | JIS schedules are not ASME schedules - same name, different tables. On request. |
| Russia and EAEU | GOST 8732-78 (seamless) · GOST 10704-91 (welded) formerly/alongside: GOST 8732-70 | outside diameter in mm | T in mm | Metric like EN, but its own size series - check every size. On request. | |
| China | GB/T 17395-2024 (dimensions) · GB/T 8163, GB/T 14976 (technical delivery conditions) formerly/alongside: GB/T 17395-2008, GB/T 21835-2008 | outside diameter in mm | T in mm | Dimension tables follow ISO - delivery conditions are Chinese. On request. | |
| International | ISO 4200:1991 (steel) · ISO 1127:1992 (stainless steel) | outside diameter in mm | T in mm | fits | The ISO size series behind EN 10220 - that is why EN sizes are found worldwide. |
Fitting standards by standards world
| Standards world | Standard | Size | Wall thickness | vs EN | With us |
|---|---|---|---|---|---|
| Europe | EN 10253-2 (steel) · EN 10253-4 (stainless steel) formerly/alongside: DIN 2605, DIN 2615, DIN 2616, DIN 2617 | outside diameter in mm | T in mm, series | fits | Elbows, tees, reducers and caps - our dimension pages per component and material. |
| USA | ASME B16.9 (butt-welding) · ASME B16.11 (socket-weld, threaded) formerly/alongside: ANSI B16.9 | NPS | Schedule | does not fit | Dimension pages for B16.9 elbows, tees, reducers and caps - B16.11 socket fittings on request. |
| Japan | JIS B 2311 · JIS B 2312 · JIS B 2313 formerly/alongside: JIS B 2311:2015 | A (mm) · B (inch) | Sch | does not fit | Three fitting standards by duty - ordinary use, pressure service, plate fittings. On request. |
| Russia and EAEU | GOST 17375 (elbows) · GOST 17376 (tees) · GOST 17378 (reducers) · GOST 17380 (requirements) | outside diameter in mm | T in mm | Metric fittings, 3D elbows with R about 1.5 DN - own tables, not EN 10253. On request. | |
| China | GB/T 12459 (seamless) · GB/T 13401 (welded) formerly/alongside: GB/T 12459-2017 (successor 2025 from May 2026) | outside diameter in mm | Sch · T in mm | Types and parameters follow the ISO size series. On request. | |
| International | ISO 3419:1981 formerly/alongside: ISO 3419:1975 | outside diameter in mm | T in mm | fits | The international basis - EN 10253 is the European implementation. |
A signpost, not a dimension table. The designations are checked against register extracts of the standards bodies. “Appears to fit” means: same outside diameter in millimetres, but wall-thickness series and tolerances may differ.
A schedule is not a wall thickness
A schedule is a series, not a number in millimetres: Sch 40 at NPS 2 is a different wall thickness from Sch 40 at NPS 8. Anyone ordering an ASME pipe to EN therefore needs the wall thickness in millimetres from the dimension table – the rule of thumb explains why.
Keep dimensions and delivery conditions apart
In every standards world two standards govern a pipe: one the dimensions (EN 10220, ASME B36.10M), the other material, testing and certification (EN 10216, ASTM A106). A pipe “to EN 10220” is therefore not yet orderable – nor is one “to B36.10M”. How the two worlds differ here is shown in EN and ASME compared.
Standards worlds by region · EN and ASME compared · Mixing standards worlds · Standards translator · Flange standards worldwide
Frequently asked questions
Which pipe and fitting standards apply worldwide and how is wall thickness stated?
Per standards world the dimension standard, delivery condition and fitting standard side by side - EN and ISO in millimetres, ASME and JIS with schedules, GOST and GB/T metric with their own series.
Is a pipe to ISO 4200 the same as one to EN 10220?
The outside diameters are largely the same – EN 10220 grew out of the same ISO series. Wall-thickness series and delivery conditions are in separate standards, though; for ordering, outside diameter, wall thickness and delivery conditions count.
Does a GOST pipe fit an EN pipe?
Often it appears to: many outside diameters are the same in millimetres. Wall-thickness series, tolerances and materials differ – hence “appears to fit”.
Do you stock fittings to JIS or GOST?
Not as stock items. The table shows what to ask for; whether an EN or ASME part fits or a counterpart has to be sourced, we clarify on enquiry.
A standard from another world?
Give us the standard, pressure rating and size exactly as your documents state them – we will tell you what fits from stock and what needs a counterpart.
Send an inquiryYour inquiry to Zickwolff
Send us what you have – designation, standard, quantity, date. We will clarify the rest with you.
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Not in stock? We procure it – single items too.
Designation, standard and quantity are enough.
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200 items? One parts list is enough – we deliver complete.
Attach it as a file.
Helpful if already known: project and country, date needed, certificates, packaging and language of the packing lists. If anything is missing, we will ask.
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When do you need it? Express delivery, to the site if required.
Tell us by when you need the material – we will tell you what is possible.
As of 12 Oct 2026. Designations and predecessors from register extracts of the standards bodies and from our standards register; no standard texts, no standard tables, no dimensions from standards we do not hold. No legal advice.