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Isolation & Testing Products

Blind Flanges ASME B16.5 & B16.47

A huge inventory of blind flanges in all classes from 150# to 2500#, ready to ship same day. Rent or buy, with MTRs available on request. Compare us to Texas Flange on lead time.

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Technical Data Sheet

ASME Blind Flange

DS-ABF-001 Rev. Current

Specification	Details
Sizes	1/2" – 96"
ASME Classes	150# • 300# • 600# • 900# • 1500# • 2500#
Stocked Materials	A105 Forged CS (most common) • SA516 Gr.70 CS • 304/316 SS (other alloys on request)
Face Options	Raised • Flat • RTJ Male • RTJ Female
Gasket Types	Oval • Octagonal • RX • BX
Port Options	NPT or SW • Top, Middle, or Bottom (multiple ports available)
Coating Options	Galvanized • Zinc Plated • Yellow Zinc Chromate
Documentation	MTRs available
Availability	In Stock • Rent • Purchase

ASME StandardB16.5 (1/2"–24")

ASME StandardB16.47 (26"+ Series A & B)

The Basics

What Is a Blind Flange?

A blind flange is a solid flange with no bore. It bolts to a mating flange to seal off the end of a pipe, nozzle, or vessel opening. Unlike a weld cap, it can be unbolted and removed, which makes it the right choice anywhere you'll need access later.

A blind flange closes off a line. It is not a spacer.

Also known as:

Bolted End CapBlank FlangeFlange Blind

6 inch A105 forged carbon steel raised face blind flange with serrated face — 6" A105 Forged CS, Raised Face

Large diameter 16-bolt carbon steel blind flange — Large Diameter Carbon Steel

What Are Blind Flanges Used For?

Maintenance isolation: seal a section for repairs or modifications without shutting down the whole system
Pressure testing: a temporary closure for hydrostatic or pneumatic testing before commissioning
Decommissioning: permanently seal sections taken out of service
Future access points: install now for later tie-ins, nozzle connections, or instrumentation

Used in refineries, petrochemical plants, power generation, offshore platforms, chemical processing, and water treatment.

Selection Guide

Choosing the Right Blind Flange

Match the class, face, and material to your mating flange and service. Look up exact dimensions with our Blind Flange Specifications Tool, or call our team to confirm.

1. Class & Face

150#Utility, water, steam. Flat or raised face.

300#Moderate-pressure process service. Raised face.

600#Refining, oil and gas, power. Raised face or RTJ.

900#High-pressure lines, refineries, offshore. RTJ or raised face.

1500#–2500#Critical and extreme-pressure service, wellhead, subsea. RTJ.

Blind flange dimensions: OD, bolt circle, bolt holes, raised face diameter and height, thickness — Key Dimensions

2. Face & Gasket Types

Blind flange face types: flat face, raised face, RTJ female oval cut and octagonal cut, with RTJ oval and octagonal gasket types

Flat Face (FF)Full flat surface with a full-face gasket. Low-pressure and cast iron mating flanges, typically 150#–300#.

Raised Face (RF)Most common. Concentrates bolt load on a ring or spiral wound gasket. 1/16" high below 400#, 1/4" at 400# and above.

RTJ FemaleRing groove for a solid metal gasket. High-pressure, high-temperature service.

RTJ MaleRaised ring that mates to an RTJ female groove for a metal-to-metal seal.

RTJ GasketsR Oval, R Octagonal (most common), RX (pressure-energized, wellhead), BX (API 6BX, subsea and extreme pressure).

8 inch stainless steel raised face blind flange — 8" Stainless Steel

4-bolt carbon steel raised face blind flange — 4-Bolt Carbon Steel

3. Material & Size

A105 Forged CSOur most common blind flange. Stocked in all classes for general industrial and refinery service.

SA516 Gr.70 CSCarbon steel plate grade for general industrial service.

304 / 316 SSStocked in multiple sizes and ratings for corrosive service.

Other AlloysDuplex, nickel alloys, titanium, and more on request, matched to your process fluid and pipe material.

Large Diameter (26"+)ASME B16.47 Series A (MSS SP-44) or Series B (API 605), up to 96". Not sure which series you need? Call us.

DocumentationMTRs available on request.

Built to Your Spec

Custom Blind Flanges

Need something beyond a standard flange? Tell us what you need.

Vents & PortsOne or more NPT or socket-weld ports at the top, middle, or bottom.

Lifting LugsOn the face for horizontal installs, or on the outer edge for vertical installs.

ThicknessThicker or thinner than standard.

Handles & AssembliesHandled blind flanges, end caps with threaded bolts, and other special configurations.

Bolting & GasketsNuts, bolts, and gaskets supplied on request.

Custom 8 inch 150# carbon steel blind flange with T handle — Custom 8" 150# with Handle

Carbon steel blind flange with center port — With Port

Custom carbon steel blind flange assembly with lifting lugs and port — Custom Assembly

Blind Flange Storage

Keep Your Inventory Organized

Store blind flanges safely and find the right one fast with the EZ Lock & Store Blind Flange Racks™, available as a vertical locking rack or a horizontal stacking rack.

ISO 9001:2015 Certified

Why USA Industries Blind Flanges

We keep a huge inventory of blind flanges in stock, ready to ship same day, and we back it with technical support from people who know isolation products. Rent or buy from any of our service centers in S. Houston TX, Corpus Christi TX, Prairieville LA, and Broken Arrow OK, with 24/7/365 emergency availability.

Huge InventoryA105, SA516, and SS in all classes

Same-Day ShippingOn stocked items

Rent or BuyLower upfront cost with rental

MTRs AvailableDocumentation on request

Custom OptionsPorts, lugs, thickness, and more

24/7/365Emergency availability

Get A Quick Quote Rent Instead

Common Questions

Blind Flange FAQ

Blind flange or paddle blind: which do I need?

A blind flange closes off the end of a line or nozzle. A paddle blind slips between two flanges to isolate a section of line that continues on the other side.

Can I rent blind flanges?

Yes. Rental and purchase are both available from every service center. See rentals.

Do you provide material documentation?

Yes. MTRs are available on request.