O-Ring Flanges | McMaster-Carr

Filter by

Pipe Size

Material

Flanged Connection Surface

Fitting Type

Fitting Connection

Pressure Class

Flange OD

Number of Bolt Holes

Flange Type

Fixed

Rotating

Pipe Schedule

Pipe Material

Fitting Material

Thread Type

UN/UNF (SAE Straight)

Shape

Bolt Circle Diameter

For Use With

Acetic Acid (White Vinegar) (5% Concentration)

Acetic Acid (White Vinegar) (10% Concentration)

Acetic Acid (White Vinegar) (75% Concentration)

Hydrochloric Acid (10% Concentration)

Hydrochloric Acid (25% Concentration)

Hydrochloric Acid (37% Concentration)

Bolt Hole Diameter

Gender

Maximum Pressure @ Temperature

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

REACH

RoHS

Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

Specifications Met

For Fitting Schedule

501 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Metal Pipe and Pipe Fittings

High-Pressure Steel Threaded SAE Pipe Flanges

Also known as Code 61 SAE hydraulic flanges.

High-Pressure Steel Threaded
SAE Two-Piece Pipe Flanges

Combine an adapter with a two-piece pipe flange (sold separately) to build a customized flange connection for noncorrosive environments.

FM-Approved Low-Pressure
Cast Iron Threaded Pipe Flanges

Suitable for use in fire-protection applications, these flanges are brittle and can be quickly opened with the strike of a sledge hammer.

High-Pressure Steel Unthreaded SAE Pipe Flanges

Also known as Code 61 SAE hydraulic flanges.

High-Pressure Steel Unthreaded Pipe Flanges

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

FM-Approved Low-Pressure Cast
Iron Unthreaded Pipe Flanges

FM-approved for fire protection applications, these flanges are cast iron, so they're brittle and can be quickly opened by hitting them with a sledge hammer.

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.

FM-Approved Iron Pipe Fittings with Flanged Ends

FM approved, these fittings are suitable for use in fire-protection systems. All have flat-surface flanged ends that only mate to another same-size flat-surface flange, pump, or valve with a gasket to create an access point in a pipeline.

High-Pressure Stainless Steel
Unthreaded SAE Pipe Flanges

Also known as Code 61 SAE hydraulic flanges.

High-Pressure Stainless Steel
Unthreaded Pipe Flanges

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

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
Threaded SAE Pipe Flanges

Also known as Code 61 SAE hydraulic flanges.

High-Pressure Stainless Steel Threaded
SAE Two-Piece Pipe Flanges

Also known as Code 61 SAE hydraulic flanges, these let you create an access point in a high-pressure hydraulic line.

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 Aluminum Threaded Pipe Flanges

Also known as Pressure Class 125 flanges, these are for use in low-pressure applications. Flanges are aluminum, which is lightweight with good corrosion resistance.

Aluminum Unthreaded Pipe Flanges

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

Brass and Bronze Unthreaded Pipe Flanges

Bolt these flanges to another same-size flange with a gasket to create an access point within a pipe line. They are also known as Silbraze flanges.

Low-Pressure Brass and
Bronze Threaded Pipe Flanges

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

Plastic Pipe and Pipe Fittings

Fiberglass Pipe Flanges for Corrosive Chemicals

Flanges have excellent corrosion resistance to handle a wide range of acids and other highly-corrosive chemicals. Use in metal surface treating applications, plating solution lines, and other chemical process applications. They are reinforced with fiberglass layers for better strength and durability than any of our other pipe flanges for chemicals. Bolt two same-size flanges together with a gasket to create an access point within a line.

Thick-Wall Plastic Pipe Flanges for Water

Bolt two same-size flanges together with a gasket to create an access point within a line. They are also known as Pressure Class 150 flanges. They have thick, strong walls to handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation.

High-Temperature PTFE
Pipe Flanges for Chemicals

Bolt two same-size flanges together with a gasket to create an access point within a line. Made of PTFE, they can handle a wider temperature range than any of our other plastic pipe flanges for chemicals. They are commonly used in high-purity chemical flow processes, such as semiconductor and clean room applications.

Flame-Retardant PVDF Pipe Flanges for Chemicals

Bolt two same-size flanges together with a gasket to create an access point within a line. Flanges meet UL 94 V-0 for flame retardance to delay the spread of flames to valuable equipment. They are PVDF, which is comparable to Kynar, and has the chemical resistance to stand up to solvents and other harsh substances. Also known as Pressure Class 150 flanges.

High-Purity Polypropylene Pipe
Flanges for Corrosive Chemicals

The inside of these flanges won’t leach contaminants into your line or accumulate particles—they’re polished to an ultra-smooth 12 Ra finish, which also makes them easy to clean. Made of polypropylene, they resist organic solvents, acids, and alkalis better than CPVC pipe flanges.

UV-Resistant Polypropylene
Pipe Flanges for Chemicals

Use these polypropylene flanges in outdoor environments—they resist the damaging effects of ultraviolet light. They have the chemical resistance to stand up to acids, solvents, and other harsh substances. Bolt two same-size flanges together with a gasket to create an access point within a line. Flanges are also known as Pressure Class 150 flanges.

CPVC Pipe Flanges for Hot Water

Bolt two same-size flanges together with a gasket to create an access point within a line. They are also known as Pressure Class 150 flanges. Use in high-temperature plumbing and water supply applications up to 200° F.

Drain, Waste, and Vent ABS
Pipe Flanges for Chemicals

Bolt two same-size flanges together with a gasket to create an access point within a line. Flanges are an economical option for gravity-flow chemical waste systems. They are ABS plastic, which has excellent strength and impact resistance and good chemical resistance.

Aboveground Standard-Wall PVC Pipe
Flanges for Drain, Waste, and Vent

Bolt two same-size flanges together with a gasket to create an access point within a line. Also known as Schedule 40 flanges, they are the industry standard for gravity-flow drain, waste, and vent (DWV) applications.

Metal Pipe and Pipe Fittings

High-Pressure Steel Threaded SAE Pipe Flanges

High-Pressure Steel ThreadedSAE Two-Piece Pipe Flanges

FM-Approved Low-PressureCast Iron Threaded Pipe Flanges

High-Pressure Steel Unthreaded SAE Pipe Flanges

High-Pressure Steel Unthreaded Pipe Flanges

FM-Approved Low-Pressure CastIron Unthreaded Pipe Flanges

Low-Pressure Steel Unthreaded Pipe Flanges

FM-Approved Iron Pipe Fittings with Flanged Ends

High-Pressure Stainless SteelUnthreaded SAE Pipe Flanges

High-Pressure Stainless SteelUnthreaded Pipe Flanges

Low-Pressure Stainless SteelUnthreaded Pipe Flanges

High-Pressure Stainless SteelThreaded SAE Pipe Flanges

High-Pressure Stainless Steel ThreadedSAE Two-Piece Pipe Flanges

Low-Pressure StainlessSteel Threaded Pipe Flanges

Low-Pressure Aluminum Threaded Pipe Flanges

Aluminum Unthreaded Pipe Flanges

Brass and Bronze Unthreaded Pipe Flanges

Low-Pressure Brass andBronze Threaded Pipe Flanges

Plastic Pipe and Pipe Fittings

Fiberglass Pipe Flanges for Corrosive Chemicals

Thick-Wall Plastic Pipe Flanges for Water

High-Temperature PTFEPipe Flanges for Chemicals

Flame-Retardant PVDF Pipe Flanges for Chemicals

High-Purity Polypropylene PipeFlanges for Corrosive Chemicals

UV-Resistant PolypropylenePipe Flanges for Chemicals

CPVC Pipe Flanges for Hot Water

Drain, Waste, and Vent ABSPipe Flanges for Chemicals

Aboveground Standard-Wall PVC PipeFlanges for Drain, Waste, and Vent

High-Pressure Steel Threaded
SAE Two-Piece Pipe Flanges

FM-Approved Low-Pressure
Cast Iron Threaded Pipe Flanges

FM-Approved Low-Pressure Cast
Iron Unthreaded Pipe Flanges

High-Pressure Stainless Steel
Unthreaded SAE Pipe Flanges

High-Pressure Stainless Steel
Unthreaded Pipe Flanges

Low-Pressure Stainless Steel
Unthreaded Pipe Flanges

High-Pressure Stainless Steel
Threaded SAE Pipe Flanges

High-Pressure Stainless Steel Threaded
SAE Two-Piece Pipe Flanges

Low-Pressure Stainless
Steel Threaded Pipe Flanges

Low-Pressure Brass and
Bronze Threaded Pipe Flanges

High-Temperature PTFE
Pipe Flanges for Chemicals

High-Purity Polypropylene Pipe
Flanges for Corrosive Chemicals

UV-Resistant Polypropylene
Pipe Flanges for Chemicals

Drain, Waste, and Vent ABS
Pipe Flanges for Chemicals

Aboveground Standard-Wall PVC Pipe
Flanges for Drain, Waste, and Vent