Stainless Steel ASME Pipe Flanges

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System of Measurement

Pipe Size

Material

Compressed Non-Asbestos Synthetic Fiber

304/304L Stainless Steel

316 Stainless Steel

316/316L Stainless Steel

Alloy 20 Stainless Steel

Fitting Connection

Pressure Class

Fitting Type

Flanged Connection Surface

Flat

Raised

Pipe Material

304 Stainless Steel

304/304L Stainless Steel

316 Stainless Steel

316/316L Stainless Steel

Alloy 20 Stainless Steel

Fitting Material

304 Stainless Steel

304/304L Stainless Steel

316 Stainless Steel

316/316L Stainless Steel

Alloy 20 Stainless Steel

Number of Bolt Holes

Pipe Schedule

Bolt Circle Diameter

Specifications Met

For Use With

Shape

Connects To

For Flange Pipe Size

Thread Type

For Fitting Schedule

For Flange ANSI Class

Bolt Hole Diameter

REACH

DFARS Specialty Metals

Exempt

Not Compliant

RoHS

Compliant

Compliant with Exemptions

Not Compliant

Export Control Classification Number (ECCN)

603 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 Stainless Steel
Unthreaded Pipe Flanges

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

Standard-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

High-Pressure Stainless Steel
Unthreaded Pipe Flanges

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

Thin-Wall Butt-Weld Stainless
Steel Unthreaded Pipe Fittings

Also known as Schedule 10 fittings, these are thin, lightweight, and corrosion resistant.

Low-Pressure Stainless
Steel Threaded Pipe Flanges

Also known as Pressure Class 150 flanges, these corrosion-resistant flanges are designed for low-pressure pipe applications.

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these corrosion-resistant fittings in a low-pressure pipe line.

High-Pressure Stainless
Steel Threaded Pipe Flanges

Also known as ANSI flanges.

Press-Connect Fittings for Copper Tubing

Crimp these fittings to copper tubing with a crimping tool for a leak-tight connection that doesn’t require heat or soldering. They are comparable to Viega ProPress fittings.

Yor-Lok Fittings for Stainless Steel Tubing

Use these fittings at pressures up to 9,700 psi. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. They are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings.

High-Temperature Metallic Pipe Gaskets

Also known as spiral-wound gaskets, these have a carbon steel outer ring and a 304 stainless steel inner sealing element with a graphite-based filler.

Flow-Control Flange Unions

Measure, throttle, and regulate the flow of liquids and gases in your line by adding an orifice plate to these unions.

Hex Head Screw and Nut Kits for Pipe Flanges

Stainless Steel Hex Screw
and Nut Kits for Pipe Flanges

Join standard-sized stainless steel and aluminum pipe flanges in corrosive conditions.

Stainless Steel Heavy Hex Screw
and Nut Kits for Pipe Flanges

Connect standard-size stainless steel pipe flanges with these kits—they come with screws and nuts in the right size and number to match the bolt holes. The screw heads are 10% wider than a standard hex head, so they spread force over a larger area, and you can tighten with more torque.

Hex Head Screw, Nut, and Washer
Kits for Plastic Pipe Flanges

Use these kits to connect plastic pipe flanges—they’re sized for Class 150 flanges made to ASME B16.5 dimensions. They come with screws, nuts, and washers that match the size and number of bolt holes for each pipe size.