This reference provides the key dimensional and identification information for a Blind Flange 1 Inch Class 600. Use the listed data when checking piping layouts, flange connections, fabrication details, and procurement requirements.
The page also explains how to interpret the nominal size, flange thickness, bolt information, hole diameter, and weight shown in the local reference data. For related design work, compare this page with the site’s resources on pipe schedules, flange types, gaskets, stud bolts, and piping isometric drawings.
Blind Flange 1″ Class 600
Blind Flange 1″ 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 1″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1″
- DN Size: DN25
- Flange Thickness: 17.5mm
- Weight: 1.8kg
- 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 1″ 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 1″ 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
A blind flange has no center bore, so its primary function is to close a flanged connection rather than provide a passage for fluid. In drawings and fabrication documents, it is typically identified by its nominal pipe size, pressure class, facing and material requirements, and connection hardware.
Understanding the listed dimensions
- NPS and DN: These identify the nominal pipe size using two commonly used designation systems. They are nominal identifiers and should be coordinated with the applicable pipe, fitting, and flange records.
- Flange thickness: This is important when checking the flange stack-up, equipment clearance, and the position of the connected piping.
- Stud bolt size and length: Confirm that the selected hardware matches the flange connection, gasket arrangement, nut engagement, and project requirements. Bolt length should not be selected from the flange listing alone.
- Hole diameter and number of bolts: These values support bolt-circle and connection coordination. The hole diameter should not be mistaken for the stud or bolt nominal size.
- Weight: The listed weight is useful for handling, support, shipping, and material takeoff reviews. Actual supplied weight can depend on manufacturing details and material requirements.
Coordination checks before use
Before releasing a drawing or purchase request, compare the flange data with the mating flange, gasket type, bolting specification, facing requirements, material specification, and project pressure-temperature requirements. The Class designation should be reviewed together with the applicable material and service conditions; it should not be treated as a complete design verification by itself.
Use the available DWG download for drafting and layout coordination, then verify critical interfaces against approved project documents and the applicable flange standard. Related pages for Class 600 flange sizes can help when checking connections across a piping system.
Blind Flange 1 Inch Class 600 FAQ
What is a Blind Flange 1 Inch Class 600 used for?
It is used to close a flanged piping, equipment, valve, or nozzle connection. The solid face provides a removable closure for isolation, maintenance, inspection, or possible future connection work.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its purpose is to blank the connection rather than allow the pipe contents to pass through.
What does NPS 1 inch and DN25 identify?
These are nominal size designations for the same listed connection size, expressed through different sizing conventions. Always coordinate the designation with the mating flange and associated piping components.
Is the hole diameter the same as the stud bolt size?
No. The hole diameter describes the opening through the flange for the hardware, while the stud bolt entry identifies the nominal hardware specification. Both values should be checked during flange and bolting coordination.
Can the CAD file be used directly for fabrication?
The DWG file is intended to support drafting, detailing, and layout coordination. Before fabrication, verify the drawing against the approved specification, project requirements, mating components, gasket, bolting, material, and applicable standard.