This reference page provides the dimensional and drafting information for a Weld Neck Flange 14 Inch Class 600. Use the source data below when checking flange geometry, bolt-hole coordination, pipe connection details, and CAD layouts.
For related terminology, see the PipeSTD references for pipe flanges, pipe schedules, and piping terminology. These topics help explain how flange dimensions coordinate with the connected pipe, gasket, bolts, and piping design documents.
Weld Neck Flange 14″ Class 600
Weld Neck Flange 14″ 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 14″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):14″
- DN Size: DN350
- Outside Diameter:603mm
- Flange Thickness:69.8mm
- Hub Diameter:432mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:412.8mm
- Weight: 161kg
- Number of Bolts:20
- Stud Bolt Size: 1 3/8″ UNC (or M36) x 235 Long
- Hole Diameter: 1 1/2″ (38.1mm)
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 14″ 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 14″ 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 Read This Weld Neck Flange Reference
The dimension list identifies the main envelope and connection features of the flange, including its outside diameter, thickness, hub geometry, raised face, bolt-hole arrangement, and stud-bolt information. These details are useful for preliminary layout, model coordination, drawing production, and fabrication review.
The bore requires particular attention. A weld neck flange is welded to the pipe, so the bore must be checked against the pipe outside diameter, wall thickness, and applicable pipe schedule. The flange’s external dimensions do not by themselves establish the correct bore for every pipe configuration.
Why the Hub and Bore Matter
The tapered hub provides a gradual transition between the flange and pipe. In service, this geometry is intended to support a more controlled load path than a short, flat flange arrangement. The weld preparation and bore alignment still need to be confirmed against the project drawings, welding procedure, and fabrication requirements.
Class, Facing, and Connection Checks
The Class designation should be evaluated together with the flange material, service temperature, pressure-temperature requirements, facing arrangement, gasket selection, and applicable project specification. It should not be treated as a standalone allowable pressure value.
Before using the bolt information for procurement or assembly, verify the mating flange, thread form, bolt material, required engagement, gasket thickness, and any project-specific tightening procedure. Hole diameter and stud length must be coordinated with the complete joint, not reviewed in isolation.
Using the CAD File
The downloadable DWG can support drafting, piping-layout coordination, and preliminary interference review. Treat the drawing as a reference resource and confirm critical geometry against the authoritative dimension data and approved project documents before fabrication. Related CAD and DWG references can help with file use, layer coordination, and drawing review workflows.
Practical Review Checklist
- Confirm the nominal pipe size and flange Class match the piping specification.
- Check the bore against the selected pipe schedule and wall thickness.
- Coordinate the raised face, gasket, and mating-flange arrangement.
- Verify bolt count, hole diameter, stud size, length, material, and tightening requirements.
- Review material, pressure-temperature limits, welding details, and inspection requirements with the responsible engineer or project specification.
Frequently Asked Questions
What is a weld neck flange?
A weld neck flange has a long tapered hub and is welded directly to the pipe. Its geometry provides a gradual transition from the pipe to the flange and is commonly selected where connection strength, alignment, and cyclic-service considerations require careful control.
Does the flange bore remain the same for every pipe schedule?
No. The bore must be matched to the connected pipe’s outside diameter and wall thickness. Confirm the applicable pipe schedule and project bore requirement before ordering or fabricating the flange.
Is Class 600 the same as a fixed pressure rating?
No. The Class designation must be evaluated with the flange material and service temperature under the applicable pressure-temperature requirements. Use the project specification and approved engineering documentation for the final rating check.
Can the DWG file be used directly for fabrication?
The DWG is useful for drafting and coordination, but it should be checked against the source dimensions, approved drawings, material requirements, welding details, and fabrication procedures before it is used for manufacture.
What should be checked before bolting the flange joint?
Confirm the mating flange, facing and gasket arrangement, bolt or stud compatibility, hole alignment, required length, thread form, material, and tightening procedure. The complete joint should be reviewed rather than relying on one dimension alone.