This reference provides the dimensional and installation-related information listed for a Blind Flange 1/2 Inch Class 400. Use the values below when checking a piping arrangement, reviewing a drawing, or coordinating a flange connection with related fittings and equipment.
The page is also useful as a starting point for comparing other blind flange sizes, reviewing flange terminology, and locating the associated CAD file. Treat the listed dimensions as reference data and confirm the project specification before procurement or fabrication.
Blind Flange 1/2″ Class 400
Blind Flange 1/2″ Class 400 is used to seal the end of a piping system or close off a flange connection in Class 400 service. It is a solid flange without a center bore and is commonly used in industrial piping systems, maintenance isolation points, and future pipeline expansion connections where a higher pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 1/2″ Class 400 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1/2″
- DN Size: DN15
- Flange Thickness: 14.2mm
- Weight: 1.5kg
- Stud Bolt Size: 1/2″ UNC (or M14) x 75 Long
- Number of Bolts: 4
- Hole Diameter: 5/8″ (15.875mm)
What Is a Blind Flange?
A blind flange is a blank flange used to close the end of a pipeline, vessel nozzle, or equipment connection. It provides a secure shutoff point and is often selected when future maintenance, inspection, or line extension may be required.
Common Applications
Blind Flange 1/2″ Class 400 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Higher pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 1/2″ Class 400, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 400 Sizes
This size is part of the Blind Flange Class 400 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, gasket type, bolt length, and applicable pressure-temperature rating.
How to Read This Blind Flange Reference
A blind flange has no center bore, so its primary function is to close a flanged opening rather than provide a passage for fluid. In practice, it may be installed at a pipe end, equipment nozzle, valve connection, or planned extension point. The connection is completed with the specified bolts or studs and a compatible gasket selected for the joint.
NPS and DN identify the nominal connection size. They are nominal designations rather than a complete description of every physical flange dimension. The thickness, hole diameter, bolt arrangement, and weight listed in the source data should therefore be reviewed together when checking fit-up or preparing a drawing.
The Class 400 designation identifies the flange class used for the reference. It should not be treated as a standalone allowable pressure value: the applicable pressure-temperature rating depends on the material, service conditions, temperature, gasket, bolting, and governing project requirements.
Drafting and Coordination Notes
- Use the downloadable DWG to support layout, detailing, and preliminary coordination, then verify the drawing against the approved project specification.
- Check the flange facing, gasket selection, bolting practice, and clearance required for installation or removal.
- Confirm whether the project uses the listed UNC bolting designation or the listed metric alternative before issuing fabrication information.
- For related research, connect this page to the site’s blind flange size index, flange dimensions reference, piping terminology guide, and CAD/DWG library.
Why the Weight Is Useful
The listed weight can assist with material takeoffs, handling planning, shipping estimates, and early support or access reviews. It should not replace a project-specific material calculation when the flange material or manufacturing requirements differ from the reference.
Blind Flange 1/2 Inch Class 400 FAQ
What is a blind flange used for?
A blind flange closes a flanged piping, vessel, valve, or equipment connection. It can provide an isolation point and can also support future maintenance, inspection, or line extension work.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its purpose is to blank off the connected opening.
What information is included in this reference?
The source data includes the nominal pipe size, DN designation, flange thickness, weight, stud bolt size, number of bolts, and hole diameter for this reference item.
Can the CAD drawing be used directly for fabrication?
The DWG is intended to support drafting, detailing, and piping layout coordination. Before fabrication, compare it with the approved project documents, material requirements, gasket specification, bolting requirements, and applicable rating information.
Is Class 400 by itself a pressure rating?
No. The applicable pressure-temperature rating must be confirmed using the flange material, service conditions, temperature, gasket, bolting, and project requirements. Do not infer a design pressure from the class designation alone.