This reference page explains how to interpret the dimensions and connection details for a Blind Flange 3/4 Inch Class 600. Use the existing technical data as the dimensional reference, then verify the flange specification against the project’s piping class, material requirements, gasket selection, and installation procedure.
A blind flange is different from a weld neck, slip-on, or threaded flange because it has no center opening for fluid passage. Its purpose is to close a flanged connection while retaining a bolted arrangement that can be removed for inspection, maintenance, or future modification. For related research, compare this page with blind flange dimensions, pipe schedules, flange terminology, bolt specifications, and CAD/DWG piping references.
Blind Flange 3/4″ Class 600
Blind Flange 3/4″ 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 3/4″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 3/4″
- DN Size: DN20
- Flange Thickness: 15.7mm
- Weight: 1.4kg
- Stud Bolt Size: 5/8″ UNC (or M16) x 90 Long
- Number of Bolts: 4
- Hole Diameter: 3/4″ (19.05mm)
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 3/4″ 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 3/4″ 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
The source data identifies the nominal pipe size, DN designation, flange thickness, mass, stud bolt details, bolt count, and hole diameter. These fields support drafting, procurement review, and preliminary piping coordination. They should not be treated as a substitute for the complete project specification or for checking the flange, gasket, bolts, and connected components as an assembled joint.
Understanding the Size Designation
NPS is the nominal pipe size convention used in many North American piping references, while DN is the corresponding metric designation shown on this page. A nominal designation is not a direct measurement of every flange feature. For fabrication and CAD work, use the listed dimensional data and the associated drawing rather than scaling a screen image or estimating geometry.
Understanding the Bolt Information
The bolt size, length, quantity, and hole diameter describe the bolted connection pattern provided in the source content. Actual bolt selection can depend on flange material, gasket thickness, facing arrangement, joint design, corrosion allowance, and the tightening method specified for the project. Confirm thread form, material compatibility, engagement, and final protrusion before ordering or installation.
Drafting and Coordination Notes
- Use the supplied CAD file as a drafting aid and check its units and insertion scale in the target design system.
- Coordinate the blind flange with the mating flange, gasket, bolts, valves, and adjacent pipe or equipment nozzle.
- Keep the flange class, nominal size, facing details, and material designation consistent across drawings, bills of material, and purchase documents.
- For pressure-boundary work, obtain engineering confirmation of the applicable pressure-temperature rating and joint assembly requirements.
Related Reference Topics
Useful companion references include flange facing types, pipe flange dimensions, ASME flange classes, pipe schedules, gasket selection, stud bolt terminology, and piping CAD block practices. These topics help connect the isolated flange dimensions to the wider piping system without replacing the governing project documents.
Frequently Asked Questions
What is a Blind Flange 3/4 Inch Class 600 used for?
It is used to close a flanged piping, equipment, valve, or nozzle connection where a solid blank is required. The bolted connection can support later access for maintenance, inspection, or system modification.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. The source content lists its bolt-hole information for connection to a mating flange.
What bolt information is provided for this flange?
The source lists 5/8-inch UNC, or M16, stud bolts with the stated length, together with four bolts and the specified hole diameter. Confirm the final bolting arrangement against the project specification and joint assembly requirements.
Can the CAD file be used for fabrication?
The CAD file is intended to support drafting, detailing, and piping layout coordination. Before fabrication, verify dimensions, units, material, facing, gasket requirements, and the current approved design documents.
Is Class 600 the same as a universal allowable pressure?
No. A flange class designation must be evaluated with the applicable material, temperature, standard requirements, gasketed joint, and project design conditions. Do not infer a safe working pressure from the class name alone.
What should be checked before installation?
Confirm the mating flange, flange material, gasket type, bolt specification and length, facing condition, alignment, tightening procedure, and applicable pressure-temperature requirements. The project engineer or responsible piping authority should approve the final assembly.