This reference page provides the published dimensions and bolting information for a Blind Flange 5 Inch Class 1500. Use the listed data when reviewing flange layouts, preparing piping details, or coordinating the associated CAD drawing. The flange closes a piping or equipment connection without providing a flow passage, making it useful where isolation, maintenance access, or a future connection is required.
For related research, compare this page with other blind flange dimensions, flange classes, pipe schedules, and stud bolt references. Those comparisons help distinguish nominal pipe size from flange geometry and help prevent the accidental use of dimensions from a different flange class.
Blind Flange 5″ Class 1500
Blind Flange 5″ 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 5″ Class 1500 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 5″
- DN Size: DN125
- Flange Thickness: 73.2mm
- Weight: 64kg
- Stud Bolt Size: 1 1/2″ UNC (or M39) x 250 Long
- Number of Bolts: 8
- Hole Diameter: 1 5/8″ (41.275mm)
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 5″ 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 5″ 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 dimension list should be read as a coordinated flange reference rather than as a standalone fabrication instruction. Nominal pipe size identifies the associated piping size designation, while flange thickness, bolt-hole details, and stud-bolt information control the physical connection. Confirm that all of these items agree with the mating flange and the project’s piping specification.
Check the Mating Connection
Before selecting the flange for installation, verify the mating flange class, facing arrangement, gasket requirements, material specification, and pressure-temperature rating. A blind flange should not be treated as interchangeable with another class or facing simply because the nominal size is the same. The listed stud-bolt option and bolt-hole information also require coordination with the complete bolting specification, including the required tightening and installation procedure.
Using the CAD File
The downloadable DWG can support drafting, equipment-layout coordination, and preliminary detailing. Treat the drawing as a dimensional reference and check its orientation, units, mating interfaces, and project revision before using it in issued design documents. The CAD file does not replace verification of the applicable standard, material, gasket, bolting, or pressure-temperature requirements.
Why the Weight Matters
The published weight is useful for handling planning, material takeoffs, and comparison of flange options. It should not be used by itself to design lifting arrangements, supports, or equipment connections. Those decisions require the complete project context and engineering review.
Blind Flange 5 Inch Class 1500 FAQ
What is the purpose of this blind flange?
It closes the end of a piping system, vessel nozzle, valve connection, or other flanged opening where a solid termination is required.
Does this flange have a center bore?
No. A blind flange is a solid flange intended to block the connection rather than provide a passage for fluid.
Can the listed stud-bolt options be mixed freely?
No. The listed UNC and metric designation should be checked against the project specification, mating flange, nuts, washers, materials, and installation procedure before procurement or assembly.
Can the DWG be used directly for fabrication?
Use the DWG for drafting and coordination, then verify the drawing revision, units, applicable standard, material, facing, gasket, bolting, and project requirements before fabrication.
Is this page a substitute for pressure-temperature verification?
No. Confirm the applicable pressure-temperature rating and all project-specific requirements before installation or service.