This reference provides dimensional and drafting information for a Weld Neck Flange 1/2 Inch Class 600. Use the listed values when reviewing flange layouts, piping details, fabrication drawings, and related CAD work.
Because weld neck flange geometry connects with both the pipe and the bolted joint, review the dimensional data together with the selected pipe schedule, bore, gasket, bolting, material specification, and project requirements.
Weld Neck Flange 1/2″ Class 600
Weld Neck Flange 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 1/2″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):1/2″
- DN Size: DN15
- Outside Diameter:95mm
- Flange Thickness:14.2mm
- Hub Diameter:38mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:34.9mm
- Weight: 1.4kg
- Number of Bolts:4
- Stud Bolt Size: 1/2″ UNC (or M14) x 75 Long
- Hole Diameter: 5/8″ (15.875mm)
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 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 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 Weld Neck Flange Reference
The dimension list below is intended for reference during piping design and detailing. The outside diameter, flange thickness, hub diameter, raised face, bolt-hole information, and weight describe the flange item, while the bore must be coordinated with the pipe wall thickness and schedule selected for the line.
For drawings, distinguish between the flange hole diameter and the stud bolt size. The hole provides clearance through the flange, while the stud specification identifies the bolting arrangement. Confirm the complete bolting detail, including length and thread form, against the mating flange, gasket arrangement, coating or material requirements, and installation method.
Drafting and CAD Coordination
The available DWG file can support piping layouts, equipment and line coordination, fabrication detailing, and dimensional review. Before using the drawing for fabrication, compare its flange orientation and connection details with the project model, mating component, pipe schedule, gasket selection, and current procurement requirements.
This page can also be used alongside related references for pipe schedules, flange dimensions, Class 600 fittings, gaskets, and CAD/DWG piping details. These related references help confirm how the flange interfaces with the rest of the piping system without treating the flange dimensions as a substitute for design verification.
Selection and Installation Checks
- Confirm the nominal pipe size and the corresponding pipe outside diameter.
- Verify that the flange bore matches the selected pipe schedule and wall thickness.
- Check the mating flange, gasket type, and raised-face arrangement.
- Confirm stud bolt size, length, hole clearance, and material requirements.
- Review the applicable pressure-temperature rating and project specification before installation.
Frequently Asked Questions
What does a weld neck flange do?
A weld neck flange is welded directly to the pipe through its tapered hub. The hub provides a gradual transition between the pipe and flange, making the connection appropriate for applications where the joint must be carefully designed for pressure, temperature, or cyclic service.
Does the flange bore have one fixed size?
Not necessarily. The bore is coordinated with the pipe schedule and wall thickness, so the correct bore should be confirmed before fabrication or ordering.
Are the stud bolt size and hole diameter the same thing?
No. The stud bolt size identifies the threaded fastener, while the hole diameter identifies the opening through the flange. Both details should be checked against the mating flange and bolting arrangement.
Can the DWG file be used directly for fabrication?
The DWG is a drafting and coordination reference. Review it against the project specification, mating components, pipe schedule, gasket, bolting, material requirements, and approved fabrication documents before manufacturing.
What should be checked before installation?
Confirm the flange material, pipe schedule, bore, gasket, bolt length, mating flange, and applicable pressure-temperature requirements. Final selection and installation should follow the responsible engineer’s project requirements.