OEM manufacturer MSS SP-97 · ASME B16.11 · ASME B1.20.1
Weldolet, Sockolet & Threadolet Branch Outlets — MSS SP-97
Weldolets, sockolets and threadolets are forged branch outlet fittings that are welded onto a run pipe to make a smaller branch connection with built-in reinforcement. Teshi Group manufactures integrally reinforced branch outlets to MSS SP-97 with butt weld, socket weld and threaded outlets, in carbon, low-temperature, alloy and stainless steels.
Also called: olets, branch outlet fittings, weldolet, sockolet, threadolet, thredolet, integrally reinforced branch outlet
What are Weldolet, Sockolet & Threadolet?
A branch outlet (olet) is a forged fitting contoured to sit on the run pipe over a hole. It is attached with a full-penetration weld, and its body provides the reinforcement the branch needs, so no separate pad is required. The outlet end is bevelled for butt welding (weldolet), socketed for socket welding (sockolet) or threaded NPT (threadolet). MSS SP-97 covers these integrally reinforced forged branch outlet fittings. Olets are used where the branch is much smaller than the run.
Key features
- Integral reinforcement per MSS SP-97 — no reinforcement pad
- Butt weld, socket weld and threaded outlets
- Contoured to fit the run pipe size
- Fewer welds than a reducing tee for small branches
- Weldolet wall matched to branch pipe: STD, XS, Sch 160, XXS
Specification
| Supply | OEM manufacturer — Teshi Group, India, India |
|---|---|
| Standard | MSS SP-97 |
| Types | Weldolet (butt weld), Sockolet (socket weld), Threadolet (threaded) |
| Rating — weldolet | Wall matched to branch pipe: Standard weight, Extra strong, Sch 160, XXS |
| Rating — sockolet / threadolet | Class 3000 and 6000 |
| Outlet ends | Bevel per ASME B16.25; socket per ASME B16.11; NPT per ASME B1.20.1 |
| 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, thermowell and pressure gauge tappings
- Drain and vent connections on headers
- Small branches from large process lines
- Steam and condensate headers
- Pipeline take-offs
Weldolet vs sockolet vs threadolet
All three are welded to the run pipe the same way; they differ in the outlet. A weldolet has a bevelled outlet for a butt-welded branch and is used for larger branches and severe service. A sockolet takes a socket-welded branch, common for small-bore lines. A threadolet has an NPT outlet for screwed connections such as gauges, thermowells and plugs.
Technical data sheets
Dimensions & weights
FAQ
Weldolet, Sockolet & Threadolet: common questions
What is the standard for weldolets, sockolets and threadolets?
MSS SP-97, Integrally Reinforced Forged Branch Outlet Fittings — Socket Welding, Threaded and Buttwelding Ends. Socket and thread details follow ASME B16.11 and ASME B1.20.1.
Are Weldolet, Sockolet and Thredolet brand names?
Yes, they are trade names of Bonney Forge that are widely used as generic terms. The generic terms are butt weld, socket weld and threaded branch outlets to MSS SP-97.
How do I specify an olet?
Give run pipe size, branch size, type, rating (schedule or class), material and standard, for example: Weldolet 10" × 2", Sch 80, ASTM A105, MSS SP-97.
When is an olet preferred over a reducing tee?
When the branch is much smaller than the run. An olet needs only the branch welds and no cut in the header line, while a tee needs three butt welds.
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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