This reference provides the local dimension data for a Blind Flange 1 Inch Class 150, including its listed thickness, weight, stud bolt specification, bolt quantity, and hole diameter. Use the page when checking a piping detail, coordinating a flange connection, or downloading the associated CAD file.
The dimensional list below is the controlling reference for this page. Related PipeSTD resources on pipe dimensions and schedules, flange types, fittings, and piping terminology can help provide additional context during drafting and design review.
Blind Flange 1″ Class 150
Blind Flange 1″ Class 150 is used to seal the end of a piping system or close off a flange connection in Class 150 service. It is a solid flange without a center bore and is commonly applied in industrial piping, maintenance isolation points, and future line expansion connections.
This dimension data is based on ANSI / ASME B16.5.
Blind Flange 1″ Class 150 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 1″
- DN Size: DN25
- Flange Thickness: 12.7mm
- Weight: 0.9kg
- Stud Bolt Size: 1/2″ UNC (or M14) x 65 Long
- Number of Bolts: 4
- Hole Diameter: 5/8″ (15.875mm)
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 150 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 1″ Class 150, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 150 Sizes
This size is part of the Blind Flange Class 150 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 opening for pipe flow. Instead, its solid face closes a flanged connection, pipe end, equipment nozzle, or temporary isolation point. Because the connection can be opened later, blind flanges are also useful where inspection, maintenance, or a future piping extension is anticipated.
What to Check in the Dimension List
- Size identification: Confirm that the nominal pipe size and DN designation match the connected piping and project drawings.
- Flange thickness and weight: Use the listed values for drafting, material takeoff review, handling planning, and model coordination. They should not be substituted with values from another flange class or size.
- Bolt arrangement: Check the listed stud bolt size, bolt quantity, and hole diameter against the mating flange and the project bolting specification.
- Standard reference: Treat the stated ANSI / ASME B16.5 reference as the dimensional basis identified by this page, while confirming the project documents before procurement or fabrication.
Connection and Selection Checks
A dimensionally matching flange is only one part of a complete connection review. Confirm the mating flange, facing and gasket requirements, flange material, bolting details, and applicable pressure-temperature requirements. Installation also requires correct alignment, gasket placement, and controlled tightening in accordance with the project or site procedure.
For drafting workflows, the available DWG file can support layout coordination and detailing. Before using it for fabrication, compare the drawing with the authoritative dimension list and the approved project specification. Use related PipeSTD references for matching flange sizes, pipe schedules, and terminology when checking adjacent components.
Blind Flange 1 Inch Class 150 FAQ
What is a Blind Flange 1 Inch Class 150 used for?
It is used to close a piping end or flanged connection and may also be used for equipment isolation, maintenance shutdown work, valve or nozzle blanking, and future line extension points.
Does a blind flange have a center bore?
No. A blind flange is solid across the center rather than providing a passage for pipe flow. Its purpose is to close the connection.
What bolt information is provided on this page?
The source data lists the stud bolt size, an alternative metric designation, the specified bolt length, the number of bolts, and the hole diameter. Confirm these details with the mating flange and project requirements before ordering.
Can the CAD file be used directly for fabrication?
The DWG file is intended for drafting, detailing, and piping layout coordination. Review it against the page data, approved drawings, material requirements, gasket selection, and applicable project specifications before fabrication.
Is Class 150 alone enough to select the flange?
No. Selection also requires confirmation of the project material specification, gasket type, bolting, mating components, and applicable pressure-temperature rating. Engineering and project requirements govern the final selection.