OEM manufacturer ASME B16.11 · ASME B1.20.1
Threaded Tees — ASME B16.11
A threaded tee is a forged fitting with three female threaded ends used to branch a small-bore threaded line at 90°. Teshi Group manufactures threaded tees to ASME B16.11 in Class 2000, 3000 and 6000, with NPT threads to ASME B1.20.1.
Also called: screwed tee, NPT tee, forged threaded tee, female threaded tee
What is a Threaded Tee?
A threaded tee is machined from a solid forging with taper pipe threads on the run and branch. Threaded pipe or nipples screw into each end, making a branch without welding. Equal tees have the same thread size on all ends; reducing tees have a smaller branch. They are used for instrument connections, gauge tappings and utility branches where screwed joints are permitted.
Key features
- Equal and reducing tees per ASME B16.11
- Class 2000, 3000 and 6000
- NPT threads per ASME B1.20.1, gauged
- Assembly without hot work
Specification
| Supply | OEM manufacturer — Teshi Group, India, India |
|---|---|
| Standard | ASME B16.11 |
| Types | Equal tee; reducing tee on request |
| Pressure class | Class 2000, 3000 and 6000 (size availability per ASME B16.11 varies by class); Class 2000 → Sch 80, Class 3000 → Sch 160, Class 6000 → XXS pipe (ASME B16.11 rating basis) |
| Size range | NPS ⅛"–4" (DN 6–100) per ASME B16.11 |
| Threads | NPT per ASME B1.20.1; BSPT (ISO 7-1) on request |
| Materials — carbon & low-temp steel | ASTM A105; ASTM A350 LF2 Cl.1 |
| Materials — alloy steel | ASTM A182 F11 Cl.2, F22 Cl.3, F5, F9, F91 |
| Materials — stainless & duplex | ASTM A182 F304, F304L, F316, F316L, F321; F51, F53 duplex |
| Testing | Visual, dimensional and thread/socket gauge inspection; PMI on alloy and stainless grades; hardness check; MPI/DPT when specified |
| Documents | EN 10204 3.1 mill test certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report; IBR certification for boiler/steam service when specified |
Applications
- Instrument and gauge connections
- Instrument air distribution
- Utility water and air piping
- Lube oil systems
- Sampling points
FAQ
Threaded Tee: common questions
What does Class 3000 mean for a threaded tee?
It is the ASME B16.11 class designation. A Class 3000 threaded tee is rated for use with Sch 160 pipe of equivalent material; Class 2000 matches Sch 80 and Class 6000 matches XXS.
Are reducing threaded tees available?
Yes. Reducing threaded tees with a smaller branch thread can be machined to order. Please give the run and branch thread sizes, class and material in the enquiry.
Do threaded fittings need a hydrotest?
ASME B16.11 does not require hydrostatic testing of individual fittings. They are tested as part of the piping system, or individually when the order specifies it.
How should threaded joints be sealed?
Use a thread sealant or PTFE tape suited to the service on NPT threads and tighten to normal make-up. For hazardous, cyclic or high-temperature service, many piping specifications require threaded joints to be seal welded.
Need a size or grade not listed here?
Our engineering team manufactures against your drawing or datasheet, with dimensional sign-off before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
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