Aluminum Branch Outlet Fittings

Aluminum branch outlet fittings are suitable for piping systems where lightweight construction, corrosion resistance and compatibility with aluminum piping are required. Commonly requested aluminum alloys include 6061-T6, 5083 and 5086, subject to the application, manufacturing method and customer specification.

 

Run size, branch size, wall thickness, connection type, thread type, outlet dimensions and other requirements can be customized according to drawings or project specifications.

 

Why Use Aluminum Branch Outlet Fittings

Advantage	Description
Integral Reinforcement	Reinforcement is part of the fitting body
Lightweight	Aluminum has approximately one-third the density of steel
Corrosion Resistance	Suitable alloys provide good corrosion resistance
Weldability	6061, 5083 and 5086 can be welded using suitable procedures
Compact Connection	Compact branch configuration compared with fabricated pad connections
Custom Dimensions	Run size, branch size, connection and outlet geometry can be customized

 

Type of Aluminum Branch Outlet Fittings

Product	Connection Type	Pressure Class / Schedule	Typical Branch Size	Main Application
Aluminum Weldolet	Butt Weld	Sch 40, Sch 80, Sch 160, XXS	NPS 3/4–24	Full-penetration welded branch connections
Aluminum Sockolet	Socket Weld	CL3000, CL6000	NPS 1/8–2	Small branch and instrument connections
Aluminum Threadolet	Threaded NPT / BSP	CL3000, CL6000	NPS 1/8–2	Threaded take-offs and small branches
Aluminum Elbolet	Butt Weld / Socket Weld / Threaded	CL3000, CL6000 or per schedule	NPS 1/4–2	Branch connections on elbows
Aluminum Nipolet	Butt Weld / Socket Weld / Threaded	According to design	NPS 1/4–2	Valve, drain and vent connections

 

 

Aluminum Weldolet

Aluminum Weldolet is a butt-weld branch outlet fitting used to connect a smaller branch pipe to a larger run pipe or header. The base of the fitting is machined to match the outside surface of the run pipe, while the branch end is prepared for welding.

 

6061-T6 is commonly considered for general engineering applications because of its combination of strength, machinability and weldability. 5083 and 5086 can be considered for marine and corrosion-resistant applications when the complete piping system is suitable for the selected alloy.

Aluminum Weldolet Specifications

Specification	Details
Product	Aluminum Weldolet
Material	6061-T6, 5083, 5086 or specified aluminum alloy
Connection	Butt Weld
Branch Angle	90° standard, 45° on request
Run Size	NPS 2–36
Branch Size	NPS 3/4–24
Schedule	Sch 40, Sch 80, Sch 160, XXS
End Preparation	Beveled according to ASME B16.25 or drawing
Surface	Mill Finish or Machined Finish
Standard	MSS SP-97 dimensional requirements where applicable
Customization	Available according to header pipe and branch pipe dimensions

 

 

Aluminum Sockolet

Aluminum Sockolet is a socket-weld branch outlet fitting used to connect a smaller branch pipe to a larger run pipe. The branch pipe is inserted into the socket before welding.

 

The socket dimensions should be confirmed according to the required pipe size, fitting specification and project requirements.

Aluminum Sockolet Specifications

Specification	Details
Product	Aluminum Sockolet
Material	6061-T6, 5083, 5086 or specified aluminum alloy
Connection	Socket Weld
Branch Angle	90° standard, 45° on request
Run Size	Customized according to header pipe
Branch Size	NPS 1/8–2
Larger Branch Sizes	Available on request
Pressure Class	CL3000, CL6000
Socket Dimensions	According to ASME B16.11 or agreed specification
Surface	Mill Finish or Machined Finish
Standard	MSS SP-97 dimensional requirements where applicable

 

 

Aluminum Threadolet

Aluminum Threadolet is a threaded branch outlet fitting with an internally threaded branch connection. It is used where a threaded connection is required for a small branch, instrument connection or other piping take-off.

 

NPT, BSP and metric threads are not interchangeable. The required thread standard should therefore be specified before production.

Aluminum Threadolet Specifications

Specification	Details
Product	Aluminum Threadolet
Material	6061-T6, 5083, 5086 or specified alloy
Connection	Female Threaded
Thread	NPT, BSP or specified thread
Branch Angle	90° standard, 45° on request
Run Size	Customized according to header pipe
Branch Size	NPS 1/8–2
Larger Branch Sizes	Available on request
Pressure Class	CL3000, CL6000
Surface	Mill Finish or Machined Finish
Thread Inspection	Gauge inspection available
Standard	MSS SP-97 dimensional requirements where applicable

 

 

Aluminum Elbolet

Aluminum Elbolet is a branch outlet fitting designed for installation on an elbow rather than on a straight run pipe. It can be used when a branch, instrument connection or other take-off is required from an elbow.

 

The fitting geometry depends on the elbow outside diameter, radius, branch size and connection method. Custom production should therefore be based on confirmed dimensional information or an engineering drawing.

Aluminum Elbolet Specifications

Specification	Details
Product	Aluminum Elbolet
Material	6061-T6, 5083, 5086 or specified alloy
Installation	Pipe Elbow
Base	Contoured to short-radius or long-radius elbow
Connection	Butt Weld, Socket Weld or Threaded
Pressure Class	CL3000, CL6000 for socket/threaded
Butt-Weld Configuration	According to applicable schedule
Branch Angle	90° or according to application
Run Size	Customized
Branch Size	NPS 1/4–2 typical
Elbow Radius	According to drawing
Surface	Mill Finish or Machined Finish

 

 

Aluminum Nipolet

Aluminum Nipolet combines a branch outlet with an integral nipple section. It can be used for valve take-offs, drains, vents and other connections where a specific outlet length is required.

Aluminum Nipolet Specifications

Specification	Details
Product	Aluminum Nipolet
Material	6061-T6, 5083, 5086 or specified alloy
Connection	Butt Weld, Socket Weld or Threaded
Pressure Class	CL3000, CL6000 for socket/threaded
Butt-Weld Configuration	According to applicable schedule
Outlet Length	Customized
Run Size	Customized according to header pipe
Branch Size	NPS 1/4–2 typical
Thread	NPT, BSP or specified thread where applicable
Surface	Mill Finish or Machined Finish

 

 

Weldolet vs Sockolet vs Threadolet

Feature	Weldolet	Sockolet	Threadolet
Branch Connection	Butt Weld	Socket Weld	Female Thread
Thread	Not applicable	Not applicable	NPT / BSP / specified thread
Pressure Specification	Sch 40–XXS	CL3000 / CL6000	CL3000 / CL6000
Branch Size	NPS 3/4–24	NPS 1/8–2	NPS 1/8–2
Welding Required	Yes	Yes	No branch-end welding
Typical Application	Larger branches and critical service	Small branches	Instrumentation, drains and take-offs
Inspection	RT possible where specified	Dimensional inspection	Thread gauge inspection

 

Aluminum Alloy Options

GNEE can supply branch outlet fittings using different aluminum alloys according to strength, corrosion resistance, welding requirements and service environment.

Aluminum Alloy	Temper	Main Characteristics	Typical Applications
6061	T6	Good strength, machinability and weldability	Industrial piping, equipment and general engineering
5083	O or specified temper	High corrosion resistance and good weldability	Marine, shipbuilding and offshore applications
5086	O or specified temper	Good corrosion resistance and weldability	Marine, transportation and industrial applications

The final alloy and temper should be selected according to service medium, temperature, pressure, welding procedure and applicable design requirements.

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Aluminum Branch Outlet Fitting Standards

Standard	Application
MSS SP-97	Integrally reinforced forged branch outlet fittings
ASME B16.11	Applicable socket-weld and threaded fitting dimensions
ASME B1.20.1	NPT thread dimensions
ASME B16.25	Butt-weld end preparation
ASME B31.3	Process piping design
AWS D1.2	Structural aluminum welding
Project Specification	Material, dimensional and inspection requirements

 

Aluminum Branch Outlet Fitting Dimensions

Aluminum branch outlet fittings are specified primarily by Run Size × Branch Size.

Run Size refers to the main or header pipe. Branch Size refers to the outlet pipe.

For Sockolets and Threadolets, pressure class should also be specified. For Weldolets, the applicable branch pipe schedule should be specified.

Common Run × Branch Combinations

Run Size	Branch Size	Typical Application	Weldolet Schedule	Sockolet / Threadolet Class
NPS 2 DN50	NPS 3/4 DN20	Instrument Take-Off	Sch 80	CL3000
NPS 3 DN80	NPS 1 DN25	Small Branch	Sch 80	CL3000
NPS 4 DN100	NPS 2 DN50	Medium Branch	Sch 40 / Sch 80	CL3000
NPS 6 DN150	NPS 2 DN50	Common Branch	Sch 40 / Sch 80	CL3000
NPS 6 DN150	NPS 3 DN80	Reducing Branch	Sch 40 / Sch 80	Not specified
NPS 8 DN200	NPS 2 DN50	Instrument / Drain	Sch 80	CL3000
NPS 8 DN200	NPS 3 DN80	Medium Branch	Sch 40 / Sch 80	Not specified
NPS 8 DN200	NPS 4 DN100	Large Branch	Sch 40 / Sch 80	Not specified
NPS 10 DN250	NPS 4 DN100	Process Branch	Sch 40 / Sch 80	Not specified
NPS 12 DN300	NPS 6 DN150	Major Branch	Sch 40 / Sch 80	Not specified

These are common reference combinations from the source document. Custom Run Size × Branch Size combinations can be considered, but the run size, branch size and wall thickness must be confirmed because the Olet base needs to match the run pipe geometry.

 

Key Dimensional Parameters

Parameter	Description
Run Size	Main or header pipe nominal size, NPS or DN
Branch Size	Branch or outlet pipe nominal size, NPS or DN
Run Wall Thickness	Wall thickness or schedule of header pipe
Branch Wall Thickness	Wall thickness or schedule of branch pipe
Pressure Class	CL3000 or CL6000 for applicable Sockolet / Threadolet configurations
Weldolet Schedule	Sch 40, Sch 80, Sch 160 or XXS according to design
Outlet Height	Height of branch outlet from run pipe surface
Base Diameter / Width	Contact geometry contoured to run pipe OD
Overall Length	Total fitting dimension, particularly relevant to Nipolet
Thread Size	NPT, BSP or specified thread
Socket Depth	Required for Sockolet
End Preparation	Butt-weld preparation for Weldolet
Branch Angle	90° standard, 45° available on request

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Applications of Aluminum Branch Outlet Fittings

Aluminum branch outlet fittings can be used in piping systems where lightweight construction and aluminum compatibility are required.

Application	Typical Requirements
Marine Piping	Corrosion resistance and weight reduction
Shipbuilding	Lightweight piping components
Offshore Equipment	Corrosion-resistant aluminum alloys where suitable
Industrial Piping	Lightweight branch connections
Instrumentation	Small branch and threaded connections
HVAC Systems	Lightweight piping and equipment connections
Compressed Air	Suitable aluminum alloy and pressure design
Equipment Piping	Compact branch connections
Drain and Vent Systems	Nipolet and threaded configurations

 

Manufacturing Process

The manufacturing process depends on the fitting type, alloy, temper, dimensions and customer specification.

Production Step	Main Process
Material Selection	Select aluminum alloy and temper
Forming	Forging or forming according to product design
Heat Treatment	Applied when required by material specification
CNC Machining	Machine outlet and contact surfaces
Contouring	Match fitting base to run pipe geometry
Thread Machining	Produce NPT, BSP or specified threads
Socket Machining	Machine socket dimensions
End Preparation	Prepare butt-weld ends where required
Inspection	Dimensional and surface inspection
Marking	Product identification and traceability
Packaging	Protective export packaging

 

Quality Inspection

GNEE can arrange inspection according to the agreed quality requirements.

Inspection Item	Inspection Method	Purpose
Material	Material Certificate or Chemical Analysis	Verify alloy and temper
Chemical Composition	OES where required	Confirm material chemistry
Dimensions	Caliper, Micrometer or CMM	Verify fitting dimensions
Thread	Thread Gauge	Verify thread size and profile
Socket	Dimensional Measurement	Verify socket dimensions
Surface	Visual Inspection	Check machining and surface condition
Weld Preparation	Dimensional Inspection	Verify welding end preparation
Marking	Visual Inspection	Confirm product identification
Documentation	MTC and Inspection Report	Provide traceability

 

 

 

 

Packaging and Delivery

Aluminum branch outlet fittings are protected against scratches, impact and surface damage during transportation.

Packaging Method	Application
Plastic Bag	Individual product protection
Foam Protection	Protection against impact and scratching
Carton	Small and medium fittings
Wooden Case	Export shipment and heavy fittings
Wooden Pallet	Bulk orders
Customized Packaging	Customer-specific requirements

 

 

 

How to Order Aluminum Branch Outlet Fittings

 

 

Providing complete technical information helps reduce quotation time and avoids dimensional or connection errors.

Required Information	Example
Product Type	Aluminum Weldolet
Material	6061-T6
Standard	MSS SP-97
Run Size	NPS 6
Branch Size	NPS 2
Connection	Butt Weld
Wall Thickness	According to pipe specification
Quantity	50 pcs
Surface	Mill Finish
Inspection	Dimensional Inspection
Packaging	Export Wooden Case

Example inquiry:

6061-T6 Aluminum Weldolet, NPS 6 × NPS 2, Butt Weld, MSS SP-97, 50 pcs, Mill Finish, dimensional inspection required.

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Frequently Asked Questions

What is an aluminum branch outlet fitting?

An aluminum branch outlet fitting is used to create a branch connection from a larger run pipe or header to a smaller branch pipe. Common types include Weldolet, Sockolet, Threadolet, Elbolet and Nipolet.

What aluminum alloy is commonly used for Weldolet?

6061-T6 can be considered for general engineering applications. 5083 and 5086 can be considered for marine and corrosion-resistant applications where suitable for the service conditions.

What is the difference between Weldolet and Sockolet?

Product	Connection
Weldolet	Butt Weld
Sockolet	Socket Weld
Threadolet	Threaded

What does Run Size × Branch Size mean?

Run Size identifies the main or header pipe. Branch Size identifies the pipe connected to the outlet.

For example, NPS 8 × NPS 2 means an 8-inch run pipe with a 2-inch branch connection.

Can aluminum Weldolets be customized?

Yes. Custom requirements can include alloy, temper, run size, branch size, wall thickness, outlet geometry, connection type, thread and machining dimensions.

Can you supply 5083 and 5086 aluminum branch outlet fittings?

Yes, subject to product availability, manufacturing requirements and application suitability. These alloys can be considered for marine and corrosion-resistant applications.

Can aluminum branch outlet fittings comply with MSS SP-97?

MSS SP-97 is associated with integrally reinforced forged branch outlet fittings. The specific applicability and compliance of an aluminum fitting should be confirmed according to the material, manufacturing method, dimensions and customer specification.

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