This reference provides the dimension and identification data for a Blind Flange 5 Inch Class 300. Use the source section below when checking flange thickness, weight, stud bolt information, bolt-hole details, and the associated CAD file.
Blind flanges are useful reference components in piping layouts because they close an open flanged connection without providing a flow passage. They may also support maintenance planning, equipment isolation, and future connection work, subject to the project design and safety requirements.
Blind Flange 5″ Class 300
Blind Flange 5″ Class 300 is used to seal the end of a piping system or close off a flange connection in Class 300 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 300 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 5″
- DN Size: DN125
- Flange Thickness: 33.3mm
- Weight: 15.9kg
- Stud Bolt Size: 3/4″ UNC (or M20) x 120 Long
- Number of Bolts: 8
- 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 5″ Class 300 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 300, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 300 Sizes
This size is part of the Blind Flange Class 300 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
When reviewing the listed dimensions, distinguish between the nominal pipe size, the flange geometry, and the fastening information. Nominal size identifies the connected piping designation; flange thickness and hole details support drafting and component coordination; and the bolt description helps the installer or designer verify the intended bolting arrangement.
The listed weight is useful for handling estimates, material takeoffs, and general layout coordination. It should not be treated as a lifting instruction. Actual handling requirements depend on the complete assembly, site procedure, equipment, and applicable safety controls.
Class Rating and Project Verification
A Class 300 designation identifies the flange class used for selection and coordination, but it should not be treated as a standalone allowable pressure value. Pressure-temperature capability depends on factors such as material, temperature, gasketed joint details, bolting, and the governing project requirements. Confirm the complete rating basis before fabrication or installation.
Drafting and CAD Coordination
The downloadable DWG can help with piping layouts, equipment connection studies, and fabrication documentation. Check the drawing orientation, units, mating flange details, gasket arrangement, and clearance requirements against the project model before issuing a drawing.
For related research, link this page to the site’s blind flange dimensions, flange bolt size references, pipe schedules, flange terminology, and CAD/DWG resources. These connections help readers compare adjacent sizes and coordinate the flange with the rest of a piping assembly.
Frequently Asked Questions
What is a blind flange?
A blind flange is a solid flanged component used to close the end of a pipe, vessel nozzle, valve connection, or other flanged opening. Unlike a bored flange, it has no center flow passage.
What information should be checked before ordering?
Verify the nominal size, flange class, material specification, facing and gasket requirements, bolt or stud details, hole arrangement, and project pressure-temperature requirements. Confirm that the selected component matches the mating flange and the applicable design documentation.
Can the listed weight be used for lifting planning?
The listed weight can support preliminary material and handling estimates, but it should not replace a site-specific lifting assessment. Include the complete assembly and follow the project’s approved handling procedure.
What is the CAD file used for?
The DWG file can support drafting, piping layout coordination, and connection studies. Review its units and geometry against the project’s required conventions before using it in issued design documents.
Does Class 300 alone determine allowable pressure?
No. The applicable pressure-temperature capability depends on the flange material, operating conditions, joint configuration, bolting, gasket selection, and governing requirements. Engineering verification is required for the final application.