ASME B16.11
Forged fittings, socket-welding and threaded
Covers forged socket-welding and threaded fittings — elbows, tees, couplings, caps, unions and plugs — in Class 2000, 3000, 6000 and 9000.
- Dimensional standards
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASME B16.11
The points that decide whether material to ASME B16.11 is accepted at inspection.
- Socket-weld classes are 3000, 6000 and 9000; threaded classes are 2000, 3000 and 6000.
- Threads are NPT to ASME B1.20.1.
- Used mainly for NPS 2 and smaller.
Products made to ASME B16.11
How ASME B16.11 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 B16.11 — questions buyers ask
What does ASME B16.11 cover?
Covers forged socket-welding and threaded fittings — elbows, tees, couplings, caps, unions and plugs — in Class 2000, 3000, 6000 and 9000.
Does ASME B16.11 specify the material?
No. ASME B16.11 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