This reference page provides the source dimensions and drafting information for a Blind Flange 2 Inch Class 400. The flange is a solid closure component with no center bore, allowing a piping, vessel, valve, or equipment connection to be isolated or closed.
Use the dimensional data below when checking drawings, preparing a piping layout, or coordinating a flange connection. The listed values are the local reference data for this page and should be read together with the project specification, mating flange details, gasket requirements, and installation procedure.
For related planning work, compare this reference with the site’s resources for flange dimensions, pipe size terminology, bolt and gasket selection, and CAD/DWG piping details.
Blind Flange 2″ Class 400
Blind Flange 2″ 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 2″ Class 400 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 2″
- DN Size: DN50
- Flange Thickness: 25.4mm
- Weight: 4.6kg
- Stud Bolt Size: 5/8″ UNC (or M16) x 110 Long
- Number of Bolts: 8
- 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 2″ 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 2″ 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 Read This Blind Flange Reference
The dimensional list identifies the nominal pipe size, DN designation, flange thickness, listed weight, stud bolt information, bolt quantity, and hole diameter. These values describe the physical connection and are useful for drafting, material review, and checking whether the selected fasteners correspond with the flange drilling.
Nominal Size and DN Designation
NPS and DN are two commonly used ways to identify the nominal size of a piping connection. They are reference designations rather than a complete description of every outside diameter, wall thickness, or component dimension. When coordinating this flange with pipe, fittings, valves, or equipment, verify the complete mating-component data rather than relying on the nominal designation alone.
Bolt Size, Hole Diameter, and Bolt Count
The stud bolt entry identifies the listed inch-thread option, its metric alternative, and the specified length. The hole diameter is a separate flange feature: it describes the opening through the flange for the fastener and should not be confused with the nominal pipe size or a bolt’s thread designation. The specified bolt count also matters during drawing review because the mating flange must have a compatible drilling arrangement.
Closure and Isolation Function
Unlike a weld neck, slip-on, or threaded flange, a blind flange does not provide a passage through the component. It closes the connection face and can support planned isolation, maintenance access, inspection work, or a future connection point. Safe use still depends on proper isolation, depressurization, gasket selection, bolting practice, and verification by the responsible engineering and operations teams.
CAD and Installation Coordination
The downloadable DWG can help with drafting and layout coordination. Before using the file for fabrication, check its units, insertion scale, revision control, flange face arrangement, bolt-hole orientation, and relationship to the mating component. The drawing should be checked against the project’s approved specification and the dimensional source on this page.
Material grade, gasket type, facing details, bolt condition, tightening method, and pressure-temperature requirements should be confirmed before procurement or installation. A dimensional match alone does not establish that a flange assembly is appropriate for a particular service.
Blind Flange 2 Inch Class 400 FAQ
What is a blind flange used for?
A blind flange closes the end of a piping system or a flanged equipment connection. It is commonly used for isolation, maintenance, inspection, valve or nozzle blanking, and planned future expansion.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its purpose is to close the connection rather than provide a flow passage.
What bolt information is listed for this flange?
The reference lists stud bolt size as 5/8 inch UNC, or M16, with a length of 110, together with the specified bolt count and hole diameter. Confirm the project’s fastener specification before ordering.
Can the DWG file be used directly for fabrication?
The DWG is intended to support drafting, detailing, and piping layout coordination. It should be reviewed for units, scale, revision status, mating geometry, material requirements, and project approval before fabrication.
What should be checked before installation?
Confirm the mating flange, gasket, flange material, bolt specification, tightening procedure, isolation requirements, and applicable pressure-temperature rating. Engineering and operations personnel should verify the complete assembly for the intended service.