ASME B36.10
Welded and seamless wrought steel pipe — sizes and schedules
Sets the sizes and wall thicknesses of welded and seamless wrought steel pipe — the schedule numbers (Sch 10, 20, 40, 80, 160) and STD, XS and XXS used for carbon and alloy steel.
- Dimensional standards
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASME B36.10?
ASME B36.10 is the standard for welded and seamless wrought steel pipe dimensions — outside diameters and wall thicknesses by schedule (10, 20, 30, 40, 60, 80, 100, 120, 140, 160) and weight class (STD, XS, XXS). It is used for carbon and alloy steel pipe such as ASTM A106 and ASTM A335. Stainless pipe uses ASME B36.19 "S" schedules.
ASME B36.10 at a glance
| Product | Welded and seamless wrought steel pipe |
|---|---|
| Schedules | 10 – 160, STD, XS, XXS |
| Companion | ASME B36.19 for stainless (5S, 10S, 40S, 80S) |
B36.10 vs B36.19
| ASME B36.10 | ASME B36.19 | |
|---|---|---|
| Material | Carbon and alloy steel | Stainless steel |
| Schedules | 10 – 160, STD, XS, XXS | 5S, 10S, 40S, 80S |
| Sch 40 vs 40S | Same wall up to NPS 10 | Thinner from NPS 12 |
How to write ASME B36.10 on a purchase order
Name the product, size, material specification and grade, the dimensional standard and the certificate. An example line:
Illustrative only — sizes, tests, inspection level and any project values come from your purchase specification.
ASME B36.10 edition and verification status
Which edition we have confirmed, and what is still being checked before any numerical requirement is published here.
| Current edition | Not yet confirmed against the publisher listing |
|---|---|
| Full-text verification | In progress — numerical requirements are not published on this page |
| Edition on your order | The edition named in your purchase order or design code governs — confirm it with your enquiry |
What to know before ordering to ASME B36.10
The points that decide whether material to ASME B36.10 is accepted at inspection.
- NPS is a nominal size: a 2" pipe has an OD of 60.3 mm.
- Schedules 40 and STD are the same up to NPS 10 but differ above it.
- Stainless pipe also uses ASME B36.19.
Products made to ASME B36.10
How ASME B36.10 fits into an order
A purchase order line is only complete when it names the material standard, the dimensional standard and the inspection document. Miss one and the mill, the inspector and the buyer can each read the order differently.
Standards used with ASME B36.10
Same family
ASME B36.10 — questions buyers ask
What is ASME B36.10?
ASME B36.10 is the standard for welded and seamless wrought steel pipe dimensions — outside diameters and wall thicknesses by schedule (10, 20, 30, 40, 60, 80, 100, 120, 140, 160) and weight class (STD, XS, XXS). It is used for carbon and alloy steel pipe such as ASTM A106 and ASTM A335. Stainless pipe uses ASME B36.19 "S" schedules.
Is Schedule 40 the same as STD?
Up to NPS 10 they are the same wall; above that, STD stays at 9.53 mm while Schedule 40 increases.
Does ASME B36.10 specify the material?
No. ASME B36.10 sets dimensions; the material comes from a separate specification such as ASTM A182, A105 or B564 for flanges, or A403 and B366 for fittings. A complete order names both.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026