This reference covers the dimensional and installation information listed for a Blind Flange 4 Inch Class 600 connection. Use it to review the flange thickness, bolt arrangement, stud bolt information, hole diameter, and listed weight before coordinating piping drawings or procurement documents.
A blind flange has no center bore, so it closes a flanged connection rather than connecting two open pipe bores. The source data below is intended for dimensional reference; final selection should also account for the project specification, flange facing, material, gasket, bolting, temperature, and applicable design requirements.
Blind Flange 4″ Class 600
Blind Flange 4″ Class 600 is used to seal the end of a piping system or close off a flange connection in Class 600 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 4″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 4″
- DN Size: DN100
- Flange Thickness: 38.1mm
- Weight: 18.7kg
- 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 4″ Class 600 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 4″ Class 600, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 600 Sizes
This size is part of the Blind Flange Class 600 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
For drafting and layout work, begin with the nominal pipe size and DN designation, then check the listed flange thickness and bolt-hole information against the mating flange. The bolt data is especially important when preparing connection details, checking access for installation tools, or coordinating a flange with a valve, nozzle, or equipment connection.
The listed stud bolt size is provided in an inch-based designation with a metric alternative. These designations should not be treated as permission to substitute hardware without verification. Confirm thread form, material, length, nuts, washers, and the project bolting specification before fabrication or installation.
Connection and Design Checks
- Confirm that the mating flange has the compatible nominal size, Class 600 designation, facing, and bolt-hole pattern.
- Check gasket selection and sealing requirements with the piping or equipment specification.
- Verify that the blind flange is appropriate for the service temperature, material combination, and applicable pressure-temperature limits.
- Review the CAD/DWG file together with the project model, especially where the flange interfaces with valves, nozzles, supports, or access areas.
- Use related pipe dimensions, flange references, fitting data, and piping terminology pages when coordinating a complete connection detail.
Why the CAD File Matters
The downloadable drawing can support preliminary drafting, piping layout coordination, and equipment-interface reviews. A CAD file should still be checked against the written dimension data and the project specification before it is used for fabrication, construction, or an issued design package.
Related Reference Topics
For broader design coordination, pair this page with references covering pipe dimensions and schedules, flange types and facings, stud bolts, gaskets, fittings, and CAD/DWG piping resources. These related topics help distinguish the flange dimensions from the requirements of the complete bolted joint.
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 planned future connection.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its sealing function comes from closing the flanged opening with a gasketed and bolted connection.
Does Class 600 by itself determine the allowable pressure?
No. The applicable pressure-temperature limit depends on factors such as material, temperature, flange construction, and the governing project or piping requirements. Confirm the rating basis rather than using the class designation alone.
Can the listed inch and metric stud bolt designations be substituted freely?
No. The listed alternatives should be verified against the mating flange, thread requirements, nuts, washers, material specification, and project standards before ordering or installation.
Can the DWG file be used directly for fabrication?
Use the drawing as a drafting and coordination reference. Before fabrication, check it against the written dimensions, the latest project documents, the selected materials and gasket, and the requirements governing the complete flange connection.