This reference page provides the published dimensions and identification details for a Blind Flange 1/2 Inch Class 150. Use the original data below when checking a piping layout, preparing fabrication details, or coordinating a flange connection with related pipe, fittings, valves, and equipment.
The page also explains how to read the nominal size, bolt information, and CAD resource. Because flange selection depends on the complete piping specification, confirm the project material, gasket, bolting, facing, and pressure-temperature requirements before procurement or installation.
Blind Flange 1/2″ Class 150
Blind Flange 1/2″ Class 150 is used to seal the end of a piping system or close off a flange connection in Class 150 service. It is a solid flange without a center bore and is commonly applied in industrial piping, maintenance isolation points, and future line expansion connections.
This dimension data is based on ANSI / ASME B16.5.
Blind Flange 1/2″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1/2″
- DN Size: DN15
- Flange Thickness: 9.7mm
- Weight: 0.9kg
- Stud Bolt Size: 1/2″ UNC (or M14) x 55 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 150 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 1/2″ Class 150, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 150 Sizes
This size is part of the Blind 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, gasket type, bolt length, and applicable pressure-temperature rating.
How to Read This Blind Flange Reference
A blind flange has no center opening for flow. Unlike a weld neck, slip-on, or threaded flange, it closes a flanged connection by covering the mating flange and compressing a gasket between the sealing faces. This makes it useful where a line, nozzle, or equipment connection must be isolated or left available for later access.
Nominal Size and Metric Identification
The source identifies the component as NPS 1/2 inch and DN15. These are nominal designations used to coordinate piping components; they should not be treated as a direct measurement of the flange outside diameter or the bolt-hole diameter. When matching this flange to other components, compare the complete flange specification and mating details rather than relying on the nominal label alone.
Bolt and Hole Information
The supplied reference lists the stud bolt designation as 1/2 inch UNC or M14, with the stated length, and identifies the bolt count and hole diameter. The inch and metric alternatives should not be mixed without confirming the project’s bolting practice, thread compatibility, washer requirements, and installation procedure. Bolt length can also depend on the mating flange, gasket arrangement, and any required washers.
Using the CAD File
The downloadable DWG can support drafting, piping layout coordination, and detail development. Treat the drawing as a dimensional reference tied to the data on this page. Before fabrication, check the selected flange against the project specification, mating component, gasket, and current engineering review process.
Useful Related Reference Topics
- Compare this component with other Class 150 blind flange sizes when coordinating a piping system.
- Review pipe schedules and nominal pipe size terminology before selecting a matching pipe connection.
- Use flange and fitting references to check adjacent valves, reducers, elbows, and equipment nozzles.
- Consult piping drafting and CAD/DWG resources when preparing plan, elevation, and fabrication details.
Frequently Asked Questions
What is a Blind Flange 1/2 Inch Class 150 used for?
It is used to close a flanged piping, equipment, valve, or nozzle connection. Typical uses include line-end closure, isolation, maintenance work, and connections reserved for future expansion.
Does a blind flange have a center bore?
No. A blind flange is a solid blank flange without a center bore, so it closes the flow path at the connected flange joint.
What standard is identified for these dimensions?
The source identifies ANSI / ASME B16.5 as the reference standard. Always confirm the project specification and the applicable current requirements before ordering or fabrication.
Can the listed 1/2 inch UNC and M14 stud options be used interchangeably?
Not automatically. They represent different thread systems. Confirm the selected bolting system, thread compatibility, mating flange details, and installation requirements before use.
What should be checked before installing this flange?
Confirm the flange material, gasket type, bolting, mating connection, facing details, and pressure-temperature requirements. The final selection should be reviewed against the project specification by the responsible engineering or installation team.
Is a CAD drawing available?
Yes. The source content includes a DWG download for drafting, detailing, and piping layout coordination. Verify the drawing against the authoritative project data before releasing fabrication documents.