This reference provides the dimensional data, bolt information, and CAD resource for a 1 1/2 inch Class 600 weld neck flange. Use the listed values as a starting point for flange identification, piping layout, detailing, and component coordination.
For accurate selection, compare the flange dimensions with the connected pipe schedule, gasket arrangement, bolting requirements, and project specifications. The bore is not a universal value for every pipe configuration, so it should be checked against the pipe wall thickness and schedule before fabrication or installation.
Weld Neck Flange 1 1/2″ Class 600
Weld Neck Flange 1 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 1/2″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):1 1/2″
- DN Size: DN40
- Outside Diameter:155mm
- Flange Thickness:22.4mm
- Hub Diameter:70mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:73mm
- Weight: 3.7kg
- Number of Bolts:4
- Stud Bolt Size: 3/4″ UNC (or M20) x 110 Long
- Hole Diameter: 7/8″ (22.225mm)
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 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 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 Read This Weld Neck Flange Reference
The dimensional list identifies the flange by nominal pipe size, DN designation, pressure class, and principal geometry. Outside diameter, thickness, hub diameter, raised face diameter, bolt-hole information, and weight describe the flange itself, while the bore must be coordinated with the pipe selected for the connection.
A weld neck flange is attached to the pipe through its tapered hub. The hub creates a gradual transition between the pipe and flange, which helps manage local stress compared with flange arrangements that do not use the same tapered form. The welding procedure, pipe fit-up, material specification, and inspection requirements still require project-specific engineering review.
Why the Pipe Schedule Matters
The flange bore should match the connected pipe inside diameter and wall configuration. Review the relevant pipe schedule reference before using the drawing for fabrication, because a mismatch can affect fit-up, internal flow passage, and alignment. This is especially important when coordinating the flange with a pipe dimensions table or a piping isometric.
Bolting and Facing Checks
Use the listed stud bolt size, length, bolt count, and hole diameter when preparing a connection detail. These values should be checked together with the mating flange, gasket type, washer arrangement, and available thread engagement. The raised face is also a mating-surface feature, so confirm that the opposing flange and gasket are compatible before finalizing the connection.
Using the CAD File
The downloadable DWG can support drafting, layout coordination, and fabrication reference. Treat the file as a dimensional aid rather than a substitute for the project specification or approved fabrication drawings. When building a piping model, cross-check the drawing against related flange dimensions, stud bolt details, and the selected pipe schedule.
Related Reference Topics
- Pipe schedules: compare wall thickness and bore information for the connected pipe.
- Flange types: review weld neck, slip-on, blind, and socket weld configurations when selecting a connection.
- Gaskets and bolting: coordinate the sealing and tightening details with the mating flange.
- CAD/DWG piping resources: use related drawings for layout and detailing consistency.
Frequently Asked Questions
What is the bore of this weld neck flange?
The bore varies with the pipe schedule and pipe wall thickness. Confirm the connected pipe specification before selecting or fabricating the flange.
What does the Class 600 designation identify?
Class 600 is the pressure-class designation used to identify this flange series. The allowable pressure-temperature service must still be confirmed for the material and applicable project requirements.
How is a weld neck flange connected to the pipe?
It is welded directly to the pipe through its long tapered hub. Welding, fit-up, inspection, and material requirements should follow the approved project and fabrication documentation.
Can the DWG file be used for fabrication?
The DWG is useful for drafting, detailing, and coordination. Before fabrication, verify the drawing against the authoritative dimension data, pipe schedule, gasket, bolting, material, and project requirements.
What should be checked before installation?
Confirm the mating flange, raised-face and gasket arrangement, bolt-hole alignment, stud bolt details, bore compatibility, material specification, and applicable pressure-temperature requirements.