This reference page covers the 24 inch Class 400 weld neck flange, including the published dimensional data, bolt information, weight, and CAD drawing resource. Use the listed values when checking a piping layout, preparing fabrication details, or comparing this flange with related flange sizes.
For accurate selection, read the dimension list together with the pipe schedule, flange facing, gasket, material, and project specification. The bore is not a universal value for this entry because it depends on the connected pipe wall thickness and schedule.
Weld Neck Flange 24″ Class 400
Weld Neck Flange 24″ Class 400 is widely used in piping systems that require strong, leak-resistant flange connections. It features a long tapered hub that provides excellent stress distribution and is commonly applied in process piping, utility lines, and industrial systems where welding strength and reliability are important.
This dimension data is based on ANSI / ASME B16.5-2020.
Weld Neck Flange 24″ Class 400 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):24″
- DN Size: DN600
- Outside Diameter:914mm
- Flange Thickness:76.2mm
- Hub Diameter:702mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:692.2mm
- Weight: 405kg
- Number of Bolts:24
- Stud Bolt Size: 1 3/4″ UNC (or M45) x 265 Long
- Hole Diameter: 1 7/8″ (47.625mm)
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 24″ Class 400 is commonly used for:
- Process piping systems
- Oil and gas lines
- Water and utility piping
- Higher pressure service
- Pressure piping connections
- Industrial fabrication and maintenance work
CAD Drawing Download
This page includes the CAD drawing file for Weld Neck Flange 24″ Class 400, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 400 Sizes
This size is part of the Weld Neck Flange Class 400 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
The nominal pipe size identifies the intended piping connection, while the DN designation provides the corresponding metric reference. These labels should be coordinated with the connected pipe and fitting data rather than treated as a direct measurement of every flange feature.
The outside diameter, flange thickness, hub diameter, and raised face diameter are useful for layout checks and detailing. The hub is especially important when reviewing the transition from the flange to the pipe, because the weld neck geometry is intended to provide a gradual connection rather than a short, abrupt hub.
Bore and Pipe Schedule Coordination
The bore must be checked against the pipe schedule and actual wall thickness used on the project. This is also a useful coordination point when comparing this page with pipe dimension and schedule references, butt-weld fittings, or piping isometric drawings.
Bolting and Installation Checks
The source data identifies the bolt count, stud bolt designation, bolt length, and hole diameter. Before ordering or installing components, confirm that the mating flange, gasket, nuts, washers, and bolting specification are compatible. Bolt length should be checked against the combined flange thickness, gasket arrangement, and project assembly requirements.
Weld Neck Flange CAD and Drafting Use
The downloadable DWG can support preliminary drafting, equipment and piping layout coordination, and fabrication reference work. CAD geometry should be checked against the project specification and the selected pipe bore before it is used for final fabrication or construction documents.
Related PipeSTD References
For broader design context, review related references covering pipe schedules, flange types, flange facing terminology, stud bolts, gaskets, butt-weld fittings, and other Class 400 flange sizes. These topics help connect the dimensional data on this page with the surrounding piping system.
Frequently Asked Questions
What standard is used for this flange reference?
The source content identifies ANSI / ASME B16.5 as the reference standard and states that the dimension data is based on ANSI / ASME B16.5-2020.
What is the bore diameter for this weld neck flange?
The bore varies according to the pipe schedule and pipe wall thickness. Confirm the connected pipe specification before using a bore value in a drawing or fabrication document.
How many bolts are listed for this flange?
The source data lists 24 bolts. The mating flange and complete bolting arrangement should still be checked before installation.
What stud bolt information is provided?
The listed stud bolt designation is 1 3/4 inch UNC, or M45, with a length of 265. Confirm the project bolting specification and required installed length before procurement.
Can the DWG be used for final fabrication?
The DWG is provided as a drafting, detailing, layout coordination, and fabrication reference. Final use requires verification against the project specification, connected pipe schedule, flange facing, material, gasket, and installation requirements.
Why is a weld neck flange used?
A weld neck flange has a long tapered hub welded directly to the pipe. This configuration supports stress distribution at the flange-to-pipe transition and is commonly used where welding strength and reliability are important.