ASME B16.9
Factory-made wrought buttwelding fittings
The dimensional standard for factory-made wrought buttwelding fittings — long- and short-radius elbows, tees, reducers, caps, stub ends and returns — from NPS ½ upward.
- Dimensional standards
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASME B16.9
The points that decide whether material to ASME B16.9 is accepted at inspection.
- Wall thickness matches the pipe schedule the fitting is welded to.
- End preparation (bevel) follows ASME B16.25.
- Short-radius elbows, once in B16.28, are now part of B16.9.
Products made to ASME B16.9
How ASME B16.9 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 B16.9 — questions buyers ask
What does ASME B16.9 cover?
The dimensional standard for factory-made wrought buttwelding fittings — long- and short-radius elbows, tees, reducers, caps, stub ends and returns — from NPS ½ upward.
Does ASME B16.9 specify the material?
No. ASME B16.9 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.
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