This reference page covers the dimensions and identification details for a Blind Flange 1/2 Inch Class 2500. Use the source data below when checking flange thickness, nominal size, bolt arrangement, hole diameter, weight, and the associated CAD file.
For design and drafting workflows, compare this flange with related pipe dimensions, flange types, gasket references, stud bolt information, and piping terminology. Those references help confirm that connected components use compatible nominal sizing and connection details.
Blind Flange 1/2″ Class 2500
Blind Flange 1/2″ Class 2500 is used to seal the end of a piping system or close off a flange connection in Class 2500 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 an extremely high pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 1/2″ Class 2500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1/2″
- DN Size: DN15
- Flange Thickness: 30.2mm
- Weight: 3.2kg
- Stud Bolt Size: 3/4″ UNC (or M20) x 120 Long
- Number of Bolts: 4
- Hole Diameter: 7/8″ (22.225mm)
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 2500 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Extremely high pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 1/2″ Class 2500, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 2500 Sizes
This size is part of the Blind Flange Class 2500 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 Use This Blind Flange Reference
A blind flange has no pipe passage through its center. Its purpose is to close a flanged connection while retaining a bolted arrangement that can be removed for inspection, maintenance, equipment isolation, or a future connection. The flange should not be treated as a complete design selection by dimensions alone; material, gasket, bolting, assembly procedure, and the applicable pressure-temperature requirements must also be reviewed.
Reading the Dimension Information
- NPS and DN: These identify the nominal pipe size in customary and metric terminology. They are nominal designations rather than a direct statement of every measured flange dimension.
- Flange thickness: This is the flange body thickness listed for the referenced class and size. It is useful for drafting, fabrication review, and model coordination.
- Stud bolt information: The listed UNC or metric designation identifies the stated bolting option and length. Confirm the project’s selected thread system before procurement or installation.
- Hole diameter and bolt count: These describe the bolted connection details supplied in the source data. Do not assume that a hole diameter is the same as the nominal outside diameter of the stud.
- Weight: The listed weight supports handling, material takeoff, and shipping estimates, but lifting arrangements should be checked against the actual item and site procedure.
Drafting and Installation Checks
When using the downloadable DWG, check the drawing units, connection orientation, mating flange information, gasket seating arrangement, and clearance for bolting and tools. Before release for fabrication, compare the CAD geometry with the dimension data on this page and with the project specification.
Internal references to related blind flange sizes, flange classes, pipe schedules, and CAD/DWG resources can help users compare alternatives without confusing dimensions from different nominal sizes or pressure classes. The final selection should be verified by the responsible piping or mechanical engineer.
Frequently Asked Questions
What is a blind flange used for?
A blind flange closes the end of a pipe, vessel nozzle, valve connection, or other flanged opening. It can provide a removable isolation point for maintenance, inspection, or future system changes.
Does this blind flange have a center bore?
No. A blind flange is a solid flange without a pipe passage through its center. Its sealing and connection details must be coordinated with the mating flange and gasket arrangement.
What bolt information is listed for this flange?
The source data lists a stud bolt designation of 3/4" UNC, or M20, with a length of 120, together with four bolts and a hole diameter of 7/8" (22.225mm). Confirm whether the project requires the UNC or metric option before ordering.
Can the CAD file be used directly for fabrication?
The DWG is intended to support drafting, detailing, and piping layout coordination. Review its units and geometry against the source dimensions, project requirements, gasket specification, bolting requirements, and applicable engineering approval process before fabrication.
What should be checked before installation?
Confirm the flange material specification, gasket type, bolt selection, bolt length, assembly procedure, and applicable pressure-temperature requirements. Also verify that the mating flange and connected piping use compatible nominal and class designations.