This reference provides the dimensional data, weight, fastening information, and CAD resource for a Weld Neck Flange 6 Inch Class 2500. Use the values below for preliminary piping layout, drafting, and component identification, then verify the selected flange against the project specification before fabrication or installation.
The most important selection checks are the nominal pipe size, flange class, bore compatibility, facing details, stud bolt requirements, gasket arrangement, and material specification. The flange dimensions shown on this page should be read together with the applicable pipe schedule and the project pressure-temperature requirements.
Weld Neck Flange 6″ Class 2500
Weld Neck Flange 6″ Class 2500 is widely used in piping systems that require strong, leak-resistant flange connections under extremely high-pressure service. It features a long tapered hub that provides excellent stress distribution and is commonly applied in refineries, petrochemical plants, power generation systems, and critical industrial piping where welding strength and connection reliability are essential.
This dimension data is based on ANSI / ASME B16.5-2020.
Weld Neck Flange 6″ Class 2500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):6″
- DN Size: DN150
- Outside Diameter:483mm
- Flange Thickness:108mm
- Hub Diameter:235mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:215.9mm
- Weight: 157kg
- Number of Bolts:8
- Stud Bolt Size: 2″ UNC (or M52) x 345 Long
- Hole Diameter: 2 1/8″ (53.975mm)
What Is a Weld Neck Flange?
A weld neck flange is a type of pipe flange designed with a long tapered hub that is welded directly to the pipe. This design helps reduce stress concentration at the flange base and provides better strength under pressure, temperature fluctuation, and cyclic loading.
Common Applications
Weld Neck Flange 6″ Class 2500 is commonly used for:
- Process piping systems
- Oil and gas lines
- Refinery and petrochemical piping
- Extremely high-pressure service
- Pressure piping connections
- Industrial fabrication and maintenance work
CAD Drawing Download
This page includes the CAD drawing file for Weld Neck Flange 6″ Class 2500, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 2500 Sizes
This size is part of the Weld Neck Flange Class 2500 series. Check other sizes in the same category to find matching dimension data and CAD files for your project.
Notes
Before fabrication or installation, always confirm the latest project requirements, flange material specification, pipe schedule, bore size, gasket type, bolt length, and applicable pressure-temperature rating.
How to Read This Weld Neck Flange Reference
A weld neck flange connects to the pipe through a butt weld at its tapered hub. The hub geometry provides a gradual transition between the pipe and flange, which helps manage local stress compared with simpler flange arrangements. Welding procedure, alignment, inspection, and material compatibility remain important parts of the connection design.
Nominal Size, DN Size, and Bore
NPS and DN are nominal identification systems rather than direct descriptions of the flange’s measured bore. The actual bore must match the pipe outside diameter, wall thickness, and selected schedule. For that reason, the bore entry is identified as variable in the source data and should not be selected from the flange nominal size alone.
Face, Bolting, and Installation Checks
The listed raised-face diameter, hole diameter, bolt count, and stud bolt size define important interface and assembly information. Confirm that the mating flange, gasket, washers, nuts, and bolting practice are compatible before releasing a drawing or purchase specification. Stud length should also be checked against the complete joint stack rather than treated as an isolated value.
Using the CAD File
The downloadable DWG is useful for layout coordination, drafting, and fabrication reference. Check the drawing units, insertion scale, flange orientation, weld-end geometry, and bore representation before incorporating it into a project model. A CAD file should support—not replace—verification against the approved dimensional reference and project requirements.
For related research, connect this page to the site’s pipe schedule, flange dimensions, flange facing, stud bolt, and CAD/DWG piping reference resources. These links help readers move from component dimensions to pipe compatibility and connection detailing.
Frequently Asked Questions
What does Class 2500 identify on this flange?
Class 2500 is the flange class designation used to identify the applicable pressure-temperature rating framework. It should not be treated as a standalone allowable pressure; the complete rating depends on the governing standard, material, temperature, and project requirements.
Why does the bore diameter vary?
The bore depends on the connected pipe’s schedule and wall thickness. Confirm the pipe dimensions before selecting or detailing the flange so the weld-end and internal passage are compatible.
Is the listed weight the installed connection weight?
The source lists the flange weight. Confirm with the supplier whether the stated weight includes only the flange or any additional components, because studs, nuts, gasket, and related items may be handled separately.
Can the DWG be used as the final fabrication drawing?
The DWG is intended as a drafting and reference resource. Review its units and geometry, then verify the approved dimensions, material, weld details, bore, gasket, bolting, and inspection requirements before fabrication.
What should be checked before installation?
Confirm the project specification, flange material, pipe schedule, bore, facing, gasket, stud bolt arrangement, bolt length, and applicable pressure-temperature requirements. The mating flange and joint assembly should be checked as a complete connection.