ASME B16.47
Large-diameter steel flanges, NPS 26 through NPS 60
Covers large-diameter steel flanges from NPS 26 to NPS 60 in two series — Series A (heavier, from the old MSS SP-44) and Series B (compact, from API 605).
- Dimensional standards
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASME B16.47
The points that decide whether material to ASME B16.47 is accepted at inspection.
- Series A and Series B flanges do not bolt to each other; specify the series.
- Material is ordered to A182, A105 or B564 as usual.
- Classes run from 75 (Series B) to 900.
Products made to ASME B16.47
How ASME B16.47 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.
Related standards
ASME B16.47 — questions buyers ask
What does ASME B16.47 cover?
Covers large-diameter steel flanges from NPS 26 to NPS 60 in two series — Series A (heavier, from the old MSS SP-44) and Series B (compact, from API 605).
Does ASME B16.47 specify the material?
No. ASME B16.47 sets dimensions and pressure-temperature ratings; 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.
Do you supply certificates to this standard?
Yes. Material is supplied with mill test certificates to EN 10204 3.1 showing the standard, grade and heat number; 3.2 with third-party inspection on request.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026