This reference provides the dimensional and identification details for a 16 inch Class 600 weld neck flange, including its listed outside diameter, thickness, hub dimensions, bolt information, weight, and hole diameter. Use the source values below when checking drawings, coordinating piping layouts, or reviewing fabrication documents.
The weld neck configuration is important because its tapered hub transitions into the pipe connection. That geometry should be considered alongside the pipe schedule, bore, gasket selection, flange facing, material specification, and project requirements. For related reference work, compare this page with the site’s pipe dimensions, pipe schedules, flange dimensions, and CAD/DWG resources.
Weld Neck Flange 16″ Class 600
Weld Neck Flange 16″ 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 16″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):16″
- DN Size: DN400
- Outside Diameter:686mm
- Flange Thickness:76.2mm
- Hub Diameter:495mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:469.9mm
- Weight: 225kg
- Number of Bolts:20
- Stud Bolt Size: 1 1/2″ UNC (or M39) x 255 Long
- Hole Diameter: 1 5/8″ (41.275mm)
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 16″ 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 16″ 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 dimensional list identifies the flange envelope and connection details needed for preliminary drafting and piping coordination. The outside diameter, flange thickness, hub diameter, and raised face diameter describe the flange geometry, while the bolt count, stud bolt description, and hole diameter support connection detailing.
The bore is not a single universal dimension in this reference. It varies with the pipe schedule and wall thickness, so the flange bore should be checked against the actual pipe specification before fabrication or installation. This is especially important when preparing a section view, matching the flange to a pipe end, or reviewing internal flow continuity.
Weld Neck Geometry and Load Transfer
A weld neck flange is welded directly to the pipe through its tapered hub. Compared with a short, flat flange profile, the long hub creates a gradual transition between the pipe and flange. This is why weld neck flanges are commonly selected for applications where connection strength, stress distribution, temperature changes, or cyclic service must be evaluated.
Drafting and CAD Coordination
The downloadable DWG can support layout work, preliminary detailing, and coordination with adjacent piping components. Treat the drawing as a reference component rather than a substitute for the project’s approved fabrication drawing. Confirm the flange facing, bore, welding details, material, gasket, and bolting requirements against the applicable design documents.
Checks Before Ordering or Installation
- Match the nominal pipe size and flange class with the piping specification.
- Confirm the pipe schedule and resulting bore.
- Verify the flange material and pressure-temperature requirements.
- Check gasket type, facing details, stud bolt requirements, and available thread engagement.
- Compare the CAD geometry with the approved project model or fabrication drawing.
Frequently Asked Questions
What is a 16 inch Class 600 weld neck flange?
It is a weld neck pipe flange identified by its nominal pipe size and pressure class. The flange uses a tapered hub and is welded directly to the pipe. The source data on this page provides its listed geometry, weight, and bolting details.
Does the listed bore apply to every pipe schedule?
No. The source specifies that the bore varies with pipe schedule and pipe wall thickness. Always match the bore to the actual pipe specification before fabrication or installation.
What information is provided for the flange bolts?
The reference lists the number of bolts, the stud bolt description, and the hole diameter. These details should still be checked against the approved piping class, gasket arrangement, material requirements, and project bolting procedure.
Can the DWG be used for fabrication?
The DWG is useful for drafting, detailing, piping layout coordination, and fabrication reference. Final fabrication should use approved project documents and verify all connection, material, bore, gasket, and bolting requirements.
Is Class 600 alone enough to select this flange?
No. Selection also depends on the nominal size, pipe schedule, material, facing, design conditions, gasket, bolting, and applicable project requirements. Engineering verification is required before the flange is specified for service.