Aluminum Weld-Neck Flanges

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	Pipe Size Pipe Size

1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
5
6
8
10
12

	Type Type


Flange	Adapter

Reducing Adapter

	Class Class

	Connection Style Connection Style

Flanged

Butt Weld

Slip-On Weld

	Material Material

Steel

Stainless Steel

Aluminum

	For Pipe Material For Pipe Material

Steel

Stainless Steel

Aluminum

	Flanged Connection Surface Flanged Connection Surface


Raised	Flat

	For Pipe Schedule For Pipe Schedule


40	80

XXH

	For Use With For Use With

	Flange OD Flange OD

	Maximum Pressure Maximum Pressure

	Number of Bolt Holes Number of Bolt Holes

	Specifications Met Specifications Met

ANSI/ASME

ASTM

MSS

DIN

JIS

	Bolt Circle Diameter Bolt Circle Diameter

	Wall Thickness Wall Thickness

	Construction Construction

Seamless

Welded

	For Bolt Diameter For Bolt Diameter

	Bolt Hole Diameter Bolt Hole Diameter

	Connection Type Connection Type


Pipe	Tube

	Maximum Steam Pressure Maximum Steam Pressure

	Weight Weight

	Dash Size Dash Size

	DN Flange Size DN Flange Size

100

150

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163 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Low-Pressure Steel
Unthreaded Pipe Flanges

Bolt two flanges of the same size together with a gasket to create an access point in a pipe line.

High-Pressure Steel
Unthreaded Pipe Flanges

Forged for extra strength, these heavy duty unthreaded flanges can withstand high-pressure applications.

Extreme-Pressure Steel
Unthreaded Pipe Flanges

For excellent strength in extreme-pressure applications, choose these heavy duty Class 1500 flanges.

Low-Pressure Stainless Steel
Unthreaded Pipe Flanges

Bolt two same-size flanges together with a gasket to create an access point within a pipe line.

High-Pressure Stainless Steel
Unthreaded Pipe Flanges

Use these heavy duty forged flanges for high-pressure applications.

Aluminum Unthreaded Pipe Flanges

Use these unthreaded flanges in low-pressure applications. Also known as Class 125 flanges.

Ultra-High-Vacuum Flanges and
Fittings for Stainless Steel Tubing

Create access points in ultra-high-vacuum lines or chambers by bolting two same-size flanges together with a copper gasket between them. The flanges’ sharp edges dig into the copper gasket and form an extremely tight seal, which means they handle higher vacuum pressures than other high-vacuum fittings with rubber gaskets.

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How to Identify and Measure Fittings

Pipe, Tubing, Hose, and Fittings

Low-Pressure SteelUnthreaded Pipe Flanges

High-Pressure SteelUnthreaded Pipe Flanges

Extreme-Pressure SteelUnthreaded Pipe Flanges

Low-Pressure Stainless SteelUnthreaded Pipe Flanges

High-Pressure Stainless SteelUnthreaded Pipe Flanges