This reference provides the listed dimensions, weight, bolt information, and CAD resource for a 2 inch Class 150 weld neck flange. Use the dimensional section as the primary lookup point, then review the notes before using the information for drafting, fabrication, or installation.
The flange geometry should be considered together with the connected pipe schedule, bore requirement, gasket arrangement, fasteners, material specification, and project requirements. For related design work, also review the site’s pipe schedule references, flange terminology guide, flange dimension pages, and piping CAD resources.
Weld Neck Flange 2″ Class 150
Weld Neck Flange 2″ Class 150 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 2″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):2″
- DN Size: DN50
- Outside Diameter:152mm
- Flange Thickness:17.5mm
- Hub Diameter:78mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:92.1mm
- Weight: 2.3kg
- Number of Bolts:4
- Stud Bolt Size: 5/8″ UNC (or M16) x 85 Long
- Hole Diameter: 3/4″ (19.05mm)
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 2″ Class 150 is commonly used for:
- Process piping systems
- Oil and gas lines
- Water and utility piping
- High-temperature service
- Pressure piping connections
- Industrial fabrication and maintenance work
CAD Drawing Download
This page includes the CAD drawing file for Weld Neck Flange 2″ Class 150, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 150 Sizes
This size is part of the Weld Neck Flange Class 150 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 listed outside diameter, thickness, hub diameter, raised face diameter, bolt-hole information, and weight describe the flange reference shown on this page. These values support preliminary layout, drawing preparation, material identification, and coordination between piping and fabrication documentation.
Bore and Pipe Schedule Coordination
The bore is not presented as one fixed dimension because it varies with the connected pipe schedule and wall thickness. Confirm the pipe outside diameter, wall condition, and required internal opening before selecting or detailing the flange. This is especially important when coordinating the flange with pipe dimensions, fittings, valves, and adjoining components.
Weld Neck Geometry and Detailing
The tapered hub transitions from the flange body toward the pipe weld connection. In a drawing, show the flange orientation, raised face, bolt-hole pattern, hub profile, and pipe connection clearly enough for fabrication and inspection. The CAD download on this page can support drafting and layout coordination, but project drawings should still be checked against the governing requirements.
Bolt and Gasket Review
Use the listed bolt count, stud bolt description, hole diameter, and flange face information when developing a connection detail. Confirm the bolt specification, length, gasket type, tightening requirements, and material compatibility for the actual assembly rather than relying on the flange dimensions alone.
Design Verification
The reference standard and source data identify the dimensional basis used on this page. They do not replace project-specific verification of pressure-temperature service, materials, joining requirements, inspection criteria, or applicable engineering specifications. Check the latest project documents before fabrication or installation.
Frequently Asked Questions
What is the bore of this weld neck flange?
The bore varies according to the connected pipe schedule and pipe wall thickness. Confirm the pipe details before finalizing the flange selection or drawing.
What bolt information is listed for this flange?
The reference lists four bolts, a 5/8 inch UNC or M16 stud bolt description, the stated bolt length, and the stated hole diameter. Verify the complete fastener arrangement against the project specification.
Why does a weld neck flange have a tapered hub?
The long tapered hub provides a gradual transition between the flange and pipe. The source content identifies this geometry as helping reduce stress concentration and supporting performance under pressure, temperature fluctuation, and cyclic loading.
Can the CAD file be used for fabrication?
The DWG file is provided for drafting, detailing, piping layout coordination, and fabrication reference. Confirm dimensions, materials, weld details, tolerances, and project requirements before releasing fabrication documents.
Which standard is associated with the listed dimensions?
The page identifies ANSI / ASME B16.5 as the reference standard and states that the dimension data is based on the cited source edition. Always confirm the applicable project specification and current requirements.