This reference provides the dimensional and installation-related information for a Blind Flange 2 1/2 Inch Class 2500, including nominal size, flange thickness, weight, stud bolt information, bolt count, and hole diameter. Use the source data below as a drafting and coordination reference for piping layouts, equipment connections, and flange detailing.
Because a blind flange closes an opening rather than passing fluid through a bore, correct gasket selection, bolting, facing compatibility, material specification, and pressure-temperature verification are essential before fabrication or installation. For related design work, compare this page with the site’s flange dimensions, pipe schedule, fitting, and CAD/DWG reference resources.
Blind Flange 2 1/2″ Class 2500
Blind Flange 2 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 2 1/2″ Class 2500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 2 1/2″
- DN Size: DN65
- Flange Thickness: 57.2mm
- Weight: 25.5kg
- Stud Bolt Size: 1 1/8″ UNC (or M30) x 195 Long
- Number of Bolts: 8
- Hole Diameter: 1 1/4″ (31.75mm)
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 2 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 2 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
The dimension list identifies the key geometry and bolting information needed to represent the flange in a piping model or fabrication drawing. NPS and DN describe the nominal connection size, while thickness and weight support layout review, handling planning, and material takeoff activities. The stud bolt entry identifies the intended bolting format; the hole diameter describes the opening through the flange for the fastener assembly.
Important coordination checks
- Confirm that the blind flange facing matches the mating flange and selected gasket.
- Check that the material specification, facing details, and bolting requirements agree with the project piping class.
- Do not treat the class designation alone as a complete allowable pressure statement; verify the applicable pressure-temperature requirements for the material and service.
- Review bolt engagement, tightening procedure, access, and clearances during detailed design.
- Use the downloadable DWG with the published dimensions, then verify units and drawing scale before inserting it into a project file.
Related PipeSTD references
For broader coordination, link this reference with the site’s blind flange size series, pipe flange dimensions, pipe schedules, flange facing terminology, and piping CAD/DWG resources. These related references help users compare connection geometry without confusing nominal size with actual flange dimensions.
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 closure for isolation, maintenance, inspection, or a future connection.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its purpose is to block the opening at a flanged connection.
Are the stud bolt size and hole diameter the same thing?
No. Stud bolt size identifies the fastener specification, while hole diameter identifies the clearance opening through the flange. Both must be checked together with the mating flange and bolting requirements.
Can this flange be used without checking the project specification?
No. The published dimensions are a useful reference, but fabrication and installation should also confirm material, gasket, facing, bolting, service conditions, and the applicable pressure-temperature rating.
Where is the CAD file?
The DWG download is provided in the CAD Drawing Download section. Review the file against the published reference data before using it for fabrication, detailing, or final project coordination.