This reference page provides the published dimensional data for a Weld Neck Flange 10 Inch Class 300, along with practical guidance for checking the flange against pipe, gasket, bolting, and drafting requirements. Use the dimension list below as the local reference data, then verify project specifications before fabrication or installation.
For related terminology, see the site’s guides to pipe flanges, pipe schedules, and piping terminology. These references help explain how nominal pipe size, flange dimensions, bore selection, and schedule information work together.
Weld Neck Flange 10″ Class 300
Weld Neck Flange 10″ Class 300 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 10″ Class 300 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS):10″
- DN Size: DN250
- Outside Diameter:444mm
- Flange Thickness:46mm
- Hub Diameter:321mm
- Bore Diameter: varies depending on pipe schedule and pipe wall thickness
- Raised Face Diameter:323.8mm
- Weight: 57kg
- Number of Bolts:16
- Stud Bolt Size: 1″ UNC (or M27) x 160 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 10″ Class 300 is commonly used for:
- Process piping systems
- Oil and gas lines
- Water and utility piping
- Higher pressure service
- Pressure piping connections
- Industrial fabrication and maintenance work
CAD Drawing Download
This page includes the CAD drawing file for Weld Neck Flange 10″ Class 300, which can be used for drafting, detailing, piping layout coordination, and fabrication reference.
Available Weld Neck Flange Class 300 Sizes
This size is part of the Weld Neck Flange Class 300 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 Flange Reference
The dimensions below identify the flange’s nominal pipe size, facing geometry, hub dimensions, bolt-hole arrangement, and listed weight. For drafting, these values help establish the flange envelope and connection pattern. For fabrication, they must be coordinated with the actual pipe outside diameter, wall thickness, material specification, gasket selection, and welding details.
Why the Bore Requires a Pipe Schedule Check
The flange bore is not treated as a single universal dimension in this reference because it varies with the pipe schedule and wall thickness. Select or verify the bore only after confirming the pipe specification being connected. A nominal size identifies the piping connection category; it does not, by itself, define the pipe wall or the required bore.
Understanding the Weld Neck Hub
The tapered hub provides a gradual transition between the flange and the pipe. In service, the hub and weld connection should be considered together with the piping loads, operating conditions, alignment, and applicable fabrication requirements. The flange dimensions alone do not replace a project-specific piping or mechanical design review.
Checking Bolting and Facing Details
Use the listed bolt count, stud designation, bolt length, and hole diameter when preparing a connection detail. Confirm that the selected studs, nuts, washers where specified, gasket, and mating flange are compatible. Hole diameter is a clearance feature and should not be confused with the stud or bolt nominal size.
Using the CAD File
The downloadable DWG can support preliminary layout, drafting, detailing, and coordination. Before releasing a drawing for fabrication, compare the CAD geometry with the published dimension list and the project’s flange, pipe, gasket, and bolting requirements. Related CAD and DWG references can help with broader piping layout workflows.
Related Reference Topics
- Flange types and facing terminology
- Pipe schedules and wall-thickness references
- Pipe fittings and connection details
- Common piping and drafting terms
Frequently Asked Questions
What information does this page provide?
It provides the source dimensions, listed weight, bolt information, flange identification, application context, and a DWG download reference for the Weld Neck Flange 10 Inch Class 300.
Why is the bore listed as dependent on pipe schedule?
Pipe wall thickness changes with the selected schedule. The bore must therefore be checked against the actual pipe specification rather than selected from nominal size alone.
What should be checked before ordering or fabrication?
Confirm the project flange specification, material, pipe schedule, bore, gasket type, bolt or stud requirements, bolt length, facing arrangement, and applicable pressure-temperature requirements.
Can the DWG be used as the sole fabrication authority?
No. The DWG is a drafting and coordination resource. Compare it with the published dimensions and the approved project documents before fabrication or installation.
Does the Class 300 designation alone establish allowable service conditions?
No. Service limits depend on the applicable standard, material, temperature, design conditions, and project requirements. A qualified engineer or responsible design authority should confirm the connection for the intended service.