This reference page provides the dimensional and identification information for a Weld Neck Flange 5 Inch Class 600. Use the source values to check flange selection, piping layouts, fabrication drawings, and connection details before moving into project-specific design review.
The listed flange data includes the nominal size, DN designation, outside diameter, thickness, hub dimensions, raised face, weight, bolt count, stud bolt information, and bolt-hole diameter. These properties describe the flange itself; the final connection also depends on the mating flange, pipe schedule, gasket, bolting arrangement, material specification, and service requirements.
Weld Neck Flange 5″ Class 600
Weld Neck Flange 5″ 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 5″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):5″
- DN Size: DN125
- Outside Diameter:330mm
- Flange Thickness:44.4mm
- Hub Diameter:189mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:185.7mm
- Weight: 31kg
- Number of Bolts:8
- Stud Bolt Size: 1″ UNC (or M27) x 165 Long
- Hole Diameter: 1 1/8″ (28.575mm)
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 5″ 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 5″ 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 the Weld Neck Flange Reference
A weld neck flange is identified by its tapered hub and butt-weld connection to the pipe. The hub provides a gradual transition between the pipe and flange, while the weld creates the permanent attachment. This makes the flange geometry especially important when preparing fabrication details or coordinating the connection with adjoining piping.
Dimensions and pipe fit-up
The outside diameter, flange thickness, hub diameter, and raised face diameter are useful for layout, clearance checks, and mating-component coordination. The bore diameter is not a single universal value in this reference because it varies with the pipe schedule and wall thickness. Confirm the selected bore against the actual pipe specification rather than assuming that the nominal pipe size alone defines the opening.
Bolting information
The source lists both the number of bolts and the stud bolt size. The bolt-hole diameter is a separate flange dimension and should not be confused with the stud diameter. During detailing, check the bolt circle and mating-flange alignment from the applicable dimensional reference, then confirm bolt length after accounting for flange thickness, gasket thickness, washers, and available thread engagement.
Using the CAD file
The downloadable DWG can support preliminary drafting, piping layout coordination, and fabrication reference. Treat the drawing as a dimensional aid, not as a substitute for checking the project specification. Before issuing a drawing, verify the flange facing, bore, material, gasket arrangement, bolting, and any tolerances or fabrication requirements that apply to the job.
Related reference topics
For a complete piping reference workflow, connect this page with related resources for Class 600 flange dimensions, weld neck flange sizes, pipe schedules, flange facing terminology, stud bolt dimensions, and DWG piping details. These related topics help readers compare compatible components without treating nominal size as the only selection criterion.
Frequently Asked Questions
What information is provided for this weld neck flange?
The reference provides the flange standard designation, nominal pipe size, DN designation, primary flange and hub dimensions, raised face diameter, weight, bolt count, stud bolt information, and hole diameter.
Does the flange bore remain the same for every 5-inch pipe connection?
No. The listed bore is schedule-dependent. Confirm the pipe wall thickness and schedule before selecting or detailing the bore for a particular connection.
What is the purpose of the tapered hub?
The tapered hub provides a gradual transition from the pipe to the flange and is intended to reduce stress concentration at the flange-to-pipe region. The actual suitability of the connection still requires review of the service, materials, welding requirements, and governing project design basis.
What should be checked before using the bolt information?
Check the mating flange, bolt-hole alignment, gasket arrangement, required bolt length, thread engagement, washers, and project bolting specification. The listed stud size and hole diameter describe related but different features.
Can the DWG be used directly for fabrication?
The DWG is useful for drafting and coordination, but fabrication should proceed only after the drawing is checked against the applicable flange data, pipe schedule, material specification, gasket details, and project requirements.
Which standard is identified for the dimension data?
The source identifies ANSI / ASME B16.5 as the reference standard and states that the dimension data is based on the edition shown in the original technical content. Confirm the project-required edition and any purchaser or piping-class requirements before final use.