Branch Connection Fitting

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Branch connections are not just tee's and lateral's, they are also weldolets.  Weldolets® are welded branch connections that are designed to match or exceed the schedule of the pipe used.  Each is marked with an outlet size and the pipe sizes that it can be welded to.  If stamped 5-3x3/4" it will have an outlet size of 3/4" and fit pipe sizes 3", 3 1/2", 4", 5" and having a maximum gap between the pipe and olet of 1/32" for the largest size.

branch connection Fitting Index

If you're looking for other types of branch connections besides O'lets, click here.


Outlet Class to Pipe

Whatever your pipe size, an olet can be found to do the job.  4 inch and smaller are designed to fit numerous sizes of pipe, 5 inches and larger are designed for each specific size of pipe.  A flat base is available for connecting to pipe caps and vessel heads.

  • Class 3000 - for use with Sch. 80 pipe.
  • Class 6000 - for use with Sch. 160 pipe.
  • Class 3000 - for use with Sch. 80 pipe.
  • Class 6000 - for use with Sch. 160 pipe.

Unless otherwise specified, the following trademarked names are registered to Bonney Forge.  These fittings may be available for sale under different names.  It is up to the user to ensure that the fitting meets applicable codes, such as ANSI/ASME B16.9, ANSI/ASME B16.25 or MSS SP-97.

branch connection Design Classification

  • DSC05656Elbolet  -  An Elbolet®, abbreviared as ELO, is used on 90° long radius elbows, short radius elbows and can be used on 180° returns.  However, an Elbolet on a short radius elbow is not used often.  It typically is used for Thermowell and instrumentation connections but can be used as a drain connection when room isn't available for using a Weldolet.  The Elbolet is available with buttweld, socketweld or threaded connections.
    • For dimensions and available sizes of the Elbolet, view the datasheet.





Specialty Olet Design Classification

  • Brazolet  -  A Brazolet® is a fitting that resembles a Weldolet and is designed for use on KLM pipe (ASTM_B88) and iron pipe size ('''IPS''') brass or copper tubing. It is available with socket or threaded connections.
  • Coupolet  -  A Coupolet® is a fitting that is designed for use in fire protection sprinkler systems and other low pressure piping applications.  It comes with NPT female threads for 300# service.
  • Expanded Olet  -  A Expanded Olet® is designed to be used when the branch pipe is larger than run pipe.  It can replace the need for two fittings a tee and concentric reducer.
  • Flanged Olet  -  A Flanged Olet® is a combination of a Weldolet® and flange, available in classes 150 thru 2500 and any combination flange type.
  • Flexolet  -  A Flexolet® and Weldolet® are basically the same but with one difference.  The Flexolet® has a straight through bore and the Weldolet® has a tapered bore.
  • Insert Weldolet  -  A Insert Weldolet® is designed to be welded flush with the pipe and can replace a reducing tee or reinforcing plate.
  • Latrolet  -  A Latrolet® is similar to a Weldolet that makes a 45° reducing branch on a straight run of pipe.  End connections of a Latrolet can be buttwelded, socket welded or threaded.
  • Nipolet  -  A Nipolett® is a Weldolet® with a nipple and comes with either a plain or threaded end.  It's a one piece fitting that can be used for drains, vents or taps.
  • Sweepolet  -  A Sweepolet® is almost like a pipe saddle but has been manufactured in such a way as to minimize pipe stresses and stress concentration factors.  The weld is able to be inspected by typical weld inspection techniques such as radiography and ultrasound inspections.
    • For dimensional information on the Sweepolet, view the datasheet.

How to Order

  • Specify Size
    • Outlet size
    • Run or Header
  • Specify Style
    • Weldolet (buttweld)
    • Thredolet (threaded)
    • Sockolet (socket)
    • Elbolet, Latrolet, Sweeploet, Insert Weldolet, Nipolet, ect.
  • Indicate Class or Schedule/Pipe Wall
    • Class 3000 or 6000 - Threaded or Socket
    • STD, XS, Sch 160/XXS, ect. - Buttweld
  • Select Material
    • Carbon steel
    • Stainless steel
    • Other
  • Specify Design Code (if available)

Branch Connection Fitting Standards

  • ASME Standards
    • ASME B16.9 - Factory-Made Wrought Buttwelding Fittings
  • MSS Standards
    • MSS SP-97 - Integrally Reinforced Forged Branch Outlet Fittings - Socket Welding, Threaded, and Buttwelding End

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