This reference page provides the dimensional data, connection details, and CAD resource for a Weld Neck Flange 2 1/2 Inch Class 600. Use the listed values for drafting and preliminary coordination, then verify the flange, pipe, gasket, and bolting requirements against the project specification before fabrication or installation.
For related terminology, compare this reference with the site’s guides to pipe flange types, pipe schedules, and piping terminology. These references help explain how nominal size, bore selection, flange facing, and pipe wall thickness affect a flange connection.
Weld Neck Flange 2 1/2″ Class 600
Weld Neck Flange 2 1/2″ Class 600 is widely used in piping systems that require strong, leak-resistant flange connections under high-pressure service. It features a long tapered hub that provides excellent stress distribution and is commonly applied in process piping, utility lines, refineries, power plants, and industrial systems where welding strength and reliability are essential.
This dimension data is based on ANSI / ASME B16.5-2020.
Weld Neck Flange 2 1/2″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):2 1/2″
- DN Size: DN65
- Outside Diameter:190mm
- Flange Thickness:28.4mm
- Hub Diameter:100mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:104.8mm
- Weight: 6.8kg
- Number of Bolts:8
- Stud Bolt Size: 3/4″ UNC (or M20) x 120 Long
- Hole Diameter: 7/8″ (22.225mm)
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 2 1/2″ Class 600 is commonly used for:
- Process piping systems
- Oil and gas lines
- Water and utility piping
- 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 2 1/2″ Class 600, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 600 Sizes
This size is part of the Weld Neck Flange Class 600 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 Use This Flange Reference
The source data identifies the flange by nominal pipe size and pressure class, then lists the principal geometry used for layout and checking. Outside diameter, thickness, hub diameter, raised face diameter, bolt-hole diameter, bolt count, and weight are useful when coordinating piping models, fabrication drawings, and material takeoffs.
The bore diameter requires particular attention. It is not treated as one universal value in this reference because the bore depends on the pipe schedule and wall thickness selected for the mating pipe. Confirm the actual bore against the pipe specification before preparing a weld detail or releasing a fabrication drawing.
Weld Neck Connection Considerations
A weld neck flange uses its tapered hub as the transition between the flange and the pipe. The pipe is welded directly to the flange, so the joint detail, alignment, weld preparation, and inspection requirements should be controlled by the applicable project and fabrication documents. The flange face must also be coordinated with the gasket and the mating flange.
The listed stud-bolt information should be checked together with the bolt-hole diameter, bolt count, flange thickness, gasket thickness, and required installation practice. Do not substitute a different bolting arrangement solely because the nominal size appears similar; confirm the complete connection against the approved specification.
Drafting and CAD Coordination
Use the downloadable DWG as a starting point for piping layout, equipment-interface coordination, and detailing. Before issuing a drawing, verify units, bore selection, flange facing, weld-end geometry, and any project-specific tolerances. The site’s CAD and DWG reference collection can provide a useful path to related flange and fitting files.
Frequently Asked Questions
What information is included for this weld neck flange?
The reference includes the nominal size, DN designation, principal flange and hub dimensions, raised face and hole information, weight, bolt count, and stud-bolt specification. It also identifies the related CAD download.
Why does the bore diameter vary?
The bore is selected to suit the pipe schedule and wall thickness. Confirm the mating pipe specification before using the flange data for fabrication or procurement.
How many bolts are listed for this flange?
The source reference lists 8 bolts. Check the complete bolt-hole and gasket arrangement against the approved flange specification and mating component.
What stud-bolt information is provided?
The source lists 3/4 inch UNC (or M20) x 120 long. Treat this as the reference arrangement and verify the required material, thread form, length, washers, nuts, and installation requirements for the project.
Can the DWG be used directly for fabrication?
The DWG is intended as a drafting, layout, and fabrication reference. It should be reviewed for units, bore, facing, weld details, tolerances, and project-specific requirements before release.
What should be checked before installation?
Confirm the flange material, pipe schedule, bore, gasket, bolting, facing, alignment, applicable rating, and project requirements. Final selection and installation should follow the responsible engineer’s approved documents.