This reference page brings together the key dimensional and identification details for a Blind Flange 5 Inch Class 400. Use the source data when checking flange descriptions, preparing piping drawings, coordinating equipment connections, or reviewing maintenance isolation points.
The page also explains how to interpret the listed thickness, weight, stud bolt information, bolt quantity, and hole diameter. For related work, compare this reference with the site’s flange dimensions, pipe schedules, gasket selection, piping terminology, and CAD/DWG resources.
Blind Flange 5″ Class 400
Blind Flange 5″ Class 400 is used to seal the end of a piping system or close off a flange connection in Class 400 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 higher pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 5″ Class 400 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 5″
- DN Size: DN125
- Flange Thickness: 38.1mm
- Weight: 20kg
- Stud Bolt Size: 7/8″ UNC (or M24) x 145 Long
- Number of Bolts: 8
- 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 5″ Class 400 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Higher pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 5″ Class 400, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 400 Sizes
This size is part of the Blind Flange Class 400 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 center bore, so it closes a flanged connection rather than allowing the pipe to pass through. This makes it useful where a pipe end, nozzle, valve connection, or equipment opening must be blanked for isolation, maintenance, inspection, or possible future extension.
The dimensional list should be read as a coordinated identification record. The nominal pipe size and DN designation identify the intended piping size, while the flange thickness and listed weight support drawing review, material handling, and fabrication coordination. The stud bolt entry identifies the specified bolt notation and listed length; it should not be treated as a substitute for checking the project’s bolting requirements.
Important Checks Before Use
- Confirm that the flange standard and pressure class match the project specification.
- Check the required flange material, facing arrangement, gasket, and bolting details before fabrication or installation.
- Use the listed bolt quantity and hole diameter when reviewing connection details, but verify the complete mating-flange assembly.
- Review pressure-temperature requirements and equipment limits through the responsible engineer or project documentation.
- Use the available DWG file for drafting and layout coordination, then verify the drawing against the approved project documents.
Related Reference Topics
This page is a useful starting point for internal references covering blind flange dimensions, flange types, pipe schedules, gasket terminology, stud bolts, flange facing, and piping CAD details. Comparing entries within the Blind Flange Class 400 series can help identify matching size references without assuming that adjacent sizes share identical dimensions or bolting.
Frequently Asked Questions
What is a Blind Flange 5 Inch Class 400 used for?
It is used to close the end of a piping system or blank a flanged connection. Typical uses include pipe end closure, equipment isolation, valve and nozzle blanking, maintenance shutdown work, and future line extensions.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore, allowing it to seal or close the connected opening.
What standard is identified for this flange?
The source data identifies ANSI / ASME B16.5 and states that the dimension data is based on ANSI / ASME B16.5-2020.
How many bolts are listed?
The source data lists 8 bolts for this flange reference.
What stud bolt information is provided?
The listed stud bolt size is 7/8" UNC, or M24, with a listed length of 145. Confirm the required bolting details against the project specification and mating components before ordering.
Is a CAD drawing available?
Yes. The page includes a DWG file identified for Blind Flange 5 Inch Class 400. Use it for drafting, detailing, and piping layout coordination, subject to project-document review.