This reference page covers the dimensions and identification details for a Blind Flange 1 1/4 Inch Class 1500. Use the source data below when checking a piping layout, preparing fabrication drawings, or selecting a matching flange connection. The listing includes the nominal size, DN designation, flange thickness, weight, stud bolt information, bolt count, and hole diameter.
A blind flange has no center bore, so it closes a pipe end, equipment nozzle, valve connection, or other flanged opening. Because the connection may later need to be opened for inspection, maintenance, or system extension, accurate flange identification is important during both design coordination and field installation. Compare this page with related pipe flange dimensions, flange bolt size references, and piping CAD resources when developing a complete project detail.
Blind Flange 1 1/4″ Class 1500
Blind Flange 1 1/4″ Class 1500 is used to seal the end of a piping system or close off a flange connection in Class 1500 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 very high pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 1 1/4″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1 1/4″
- DN Size: DN32
- Flange Thickness: 28.6mm
- Weight: 4.1kg
- Stud Bolt Size: 7/8″ UNC (or M24) x 125 Long
- Number of Bolts: 4
- Hole Diameter: 1″ (25.4mm)
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 1/4″ Class 1500 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Very high pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 1 1/4″ Class 1500, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 1500 Sizes
This size is part of the Blind Flange Class 1500 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 technical list on this page is the local reference for the 1 1/4-inch Class 1500 blind flange. The nominal pipe size identifies the connection category, while the DN designation provides the corresponding metric size label shown in the source data. Thickness and weight are useful for drawing review, material handling, support coordination, and checking whether a selected component matches the intended flange series.
The stud bolt entry identifies the listed thread option and bolt length. The source also gives the number of bolts and hole diameter, which are important when coordinating the bolt circle and mating flange. Do not treat a single dimension as proof that two flanges are interchangeable: confirm the complete mating-flange geometry, facing details, gasket arrangement, material requirements, and project specification before ordering or installation.
Class and pressure-temperature checks
Class 1500 identifies the flange class used by this reference, but the applicable pressure-temperature rating must still be confirmed for the selected material and operating conditions. The flange class alone does not replace project engineering review. Check the applicable standard, material specification, gasket selection, bolting requirements, and service conditions before approving the connection.
Drafting and CAD coordination
The downloadable DWG file can support preliminary drafting, piping layout coordination, and detail development. Treat the CAD file as a dimensional aid rather than a substitute for the authoritative project specification or a fabrication drawing review. Confirm units, mating components, facing requirements, and revision status before using the geometry for manufacture.
Selection checklist
- Confirm the nominal pipe size and DN designation against the piping line list.
- Verify that the mating flange belongs to the same required flange series and connection arrangement.
- Check the listed stud bolt size, thread option, length, bolt count, and hole diameter against the project bolting specification.
- Confirm gasket type, flange material, facing details, and pressure-temperature requirements.
- Review the CAD geometry and source dimensions together before fabrication or installation.
Frequently Asked Questions
What is a Blind Flange 1 1/4 Inch Class 1500?
It is a solid, unbored flange used to close the end of a piping system or seal a flanged connection identified as 1 1/4-inch Class 1500. The source data identifies the corresponding DN size as DN32.
What are the listed dimensions and weight?
The source lists a flange thickness of 28.6mm and a weight of 4.1kg. It also identifies the stud bolt, bolt count, and hole diameter for this flange entry. Use the original dimensions list as the controlling local reference for this page.
What stud bolt size is listed?
The listed stud bolt is 7/8" UNC, or M24, with a length of 125. Confirm whether the project uses the inch-thread or metric option before procurement, and verify the final bolting arrangement with the mating flange and project specification.
Where is this blind flange used?
Typical uses listed for this component include pipe end closure, equipment isolation, valve and nozzle blanking, maintenance shutdown work, process and utility piping, and high-pressure piping applications. Actual use requires review of the service conditions and applicable engineering requirements.
Can the DWG file be used for fabrication?
The DWG is provided for drafting, detailing, and piping layout coordination. Before fabrication, verify the drawing against the source dimensions, mating components, material specification, gasket arrangement, bolting requirements, and current project requirements.
What should be checked before installation?
Confirm the latest project requirements, flange material, gasket type, bolt length, thread system, and applicable pressure-temperature rating. Also check alignment and compatibility with the mating flange before tightening or commissioning the connection.