This reference page provides the dimensional data and drafting information for a Weld Neck Flange 14 Inch Class 300. Use the source list below as the primary reference for flange geometry, bolt details, weight, and the associated CAD file.
For coordination work, compare the flange dimensions with the selected pipe outside diameter, pipe schedule, gasket arrangement, and mating flange. The bore is schedule-dependent, so it should not be assumed from the nominal flange size alone.
Weld Neck Flange 14″ Class 300
Weld Neck Flange 14″ Class 300 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 14″ Class 300 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):14″
- DN Size: DN350
- Outside Diameter:584mm
- Flange Thickness:52.3mm
- Hub Diameter:425mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:412.8mm
- Weight: 113kg
- Number of Bolts:20
- Stud Bolt Size: 1 1/8″ UNC (or M30) x 180 Long
- Hole Diameter: 1 1/4″ (31.75mm)
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 300 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 14″ Class 300, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 300 Sizes
This size is part of the Weld Neck Flange Class 300 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 Weld Neck Flange Reference
A weld neck flange connects to the pipe through its tapered hub. Unlike a loose or slip-on arrangement, the hub provides a gradual transition from the flange body to the pipe and supports a welded connection. This geometry is why weld neck flanges are commonly considered when the connection must be coordinated with piping loads, temperature changes, or repeated service conditions.
The dimensional list on this page separates the flange envelope from the connection details. Outside diameter, thickness, hub diameter, and raised face diameter describe the flange geometry. The bore requires additional selection because it depends on the pipe schedule and wall thickness being used with the flange.
Key Coordination Checks
- Pipe match: Confirm that the selected pipe size and schedule correspond with the flange bore and welding detail.
- Facing: Check the raised face arrangement against the gasket and the mating flange.
- Bolting: Use the listed bolt quantity, stud size, and hole diameter when preparing a layout or connection detail, then verify the project bolting specification before procurement.
- Clearance: Review bolt access, wrench clearance, hub space, and adjacent-piping interference in the CAD model.
- Weight: Include the listed flange weight in handling and support coordination, while recognizing that the complete connection also includes bolts, gasket, pipe, and any required coating or lining.
CAD and Related Reference Work
The downloadable DWG can support preliminary drafting, piping layout coordination, and fabrication reference. Treat the drawing as a geometric aid rather than a substitute for the project specification, approved fabrication drawing, or engineering review.
For broader design research, this page can be paired with internal references for pipe schedules, flange types, gasket selection, stud bolt terminology, and piping CAD drawings. Those references help explain how the listed flange data connects to the pipe and bolting choices used in a complete assembly.
Why the Bore Needs Separate Verification
Nominal pipe size identifies the general connection size, but the internal opening is affected by pipe wall thickness. A flange selected for one pipe schedule may not have the same bore as a flange used with another schedule. Always verify the bore, welding preparation, and pipe wall before issuing fabrication information.
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. The hub provides a gradual transition between the pipe and flange and helps manage stress at the connection.
What does Class 300 identify?
Class 300 is the flange pressure-class designation used with the applicable dimensional and rating reference. The allowable service condition still depends on the material, temperature, fluid service, governing specification, and engineering review.
Is the bore fixed for every 14-inch weld neck flange?
No. The source data identifies the bore as dependent on the pipe schedule and wall thickness. Confirm the required bore against the selected pipe before fabrication or installation.
Can the DWG be used as the final fabrication drawing?
The DWG is useful for drafting, layout coordination, and reference. Final fabrication should be checked against the project specification, material requirements, pipe schedule, gasket arrangement, bolting details, and approved engineering documents.
What should be checked before installing this flange?
Confirm the flange dimensions, pipe match, bore, facing, gasket, stud bolts, hole alignment, material specification, and applicable pressure-temperature requirements before installation.