McMaster-Carr logo
    Filter by
    Pipe Size
    Industrial Info Compare
    Fitting Type
    Industrial Info Compare
    Pipe Material
    Number of Bolt Holes
    Flanged Connection Surface
    Flange Type
    Bolt Circle Diameter
    Attribute Image
    Fitting Material
    Connects To
    Pressure Class
    Industrial Info Compare
    Pipe Schedule
    Industrial Info Snippet
    Thread Type
    Gender
    Bolt Diameter
    Bolt Hole Diameter
    Attribute Image
    Fitting Finished Material
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Compare
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    4 Products
    About Pipe and Fittings
    industrial info icon

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

    Fitting Type

    Performance

    Performance

    Threading

    High-Purity Polypropylene Pipe Flanges for Drinking Water

    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. Bolt two same-size flanges together with a gasket (not included) to create an access point in your line. These flanges meet NSF/ANSI 61 for use with drinking water, and they’re FDA compliant for direct contact with food. They also meet ASTM requirements for material and performance, and ISO requirements for dimensions.
    Also known as lap-joint flanges, they connect to pipe with stub-end straight adapters (not included). Slide the stub end adapter into your flange and weld to your pipe with socket fusion. Since the flange isn’t welded to the pipe, it can be disconnected easily for cleaning and inspecting.
    Warning: Never use plastic pipe fittings, flanges, and pipe with compressed air or gas.
    Flanges
    Image of Product. Flange with Straight Adapter. Front orientation. Pipe and Fittings. High-Purity Polypropylene Pipe Flanges for Drinking Water, Flanges, Stub End, Flat Surface.

    Flange with Straight

    Adapter

    Stub-End Fitting Connection—Stub-end flanges are also known as lap-joint flanges. Use them with a stub-end straight adapter (not included). The stub-end straight adapter slides into the flange and welds to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily for frequent cleaning and inspecting.
    NSF/ANSI 61—To adhere to safety standards for drinking water systems, use pipe that meets NSF/ANSI 61.
    Pipe
    Size
    Bolt
    Hole
    (A)
    (B)
    Flanged Connection
    Surface (B)
    Flange
    OD
    For Bolt
    Dia.
    Dia.
    No.
    Of
    Bolt Circle
    Dia.
    Pressure
    Class
    Material
    Color
    Max. Pressure
    @ Temp.
    Food Industry Std.
    Each
    Stub End
    2
    		2
    		Flat6 1/4"5/8"3/4"44 3/4"150
    		PolypropyleneLight Gray150 psi @ 72° FFDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 615352N150000000
     
    Stub-End Straight Adapters
    Image of Product. Straight Adapter. Front orientation. Pipe Stub Ends. High-Purity Polypropylene Pipe Flanges for Drinking Water.

    Straight

    Adapter

    Stub-end straight adapters are used with flanges. Slide a flange onto the stub end and weld the stub end to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily, which creates an access point for frequent cleaning and inspecting.
    Pipe
    Size
    Wall
    Thk.
    Flange
    OD
    Finished
    Material
    Each
    2
    		0.178"3 31/32"Polypropylene5381N089000000

    Extreme-Pressure Iron and Steel Threaded Pipe Flanges

    Also known as Pressure Class 1500 flanges, these have the strength to handle high pressures. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges are for use in noncorrosive environments.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Forged Flanges
    Image of Product. Front. Front orientation. Pipe and Fittings. Extreme-Pressure Iron and Steel Threaded Pipe Flanges, Forged Flanges, Female, Flanged Fitting Connection, Threaded Fitting Connection, Raised Surface.
    Image of Product. Raised Surface on Back. Back orientation. Pipe and Fittings. Extreme-Pressure Iron and Steel Threaded Pipe Flanges, Forged Flanges, Female, Flanged Fitting Connection, Threaded Fitting Connection, Raised Surface.

    Front

    Raised Surface

    on Back

    Forged flanges have better strength than cast flanges.
    Pipe
    Size
    Dash
    Size
    Bolt
    Hole
    (A)
    (B)
    (A)
    (B)
    Flanged Connection
    Surface (B)
    Flange
    OD
    For Bolt
    Dia.
    Dia.
    No.
    Of
    Bolt Circle
    Dia.
    Pressure
    Class
    Material
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    NPT Female
    1 1/4
    		1 1/4
    		2020Raised6 1/4"7/8"1"44 3/8"1500
    		Steel
    		3,700 psi @ 72° F3,200 psi @ 300° F1153T440000000
     

    Extreme-Pressure Iron and Steel Unthreaded Pipe Flanges

    For excellent strength in extreme-pressure applications, choose these heavy duty Pressure Class 1500 flanges. Bolt two same-size flanges together with a gasket (sold separately) to create an access point in a pipe line. They are for noncorrosive environments.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Forged Blind Flanges
    Image of Product. Front. Front orientation. Pipe and Fittings. Extreme-Pressure Iron and Steel Unthreaded Pipe Flanges, Forged Blind Flanges, Flanged, Raised.
    Image of Product. Raised Surface on Back. Back orientation. Pipe and Fittings. Extreme-Pressure Iron and Steel Unthreaded Pipe Flanges, Forged Blind Flanges, Flanged, Raised.

    Front

    Raised Surface

    on Back

    Forged flanges have better strength than cast flanges.
    Bolt
    Hole
    Pipe
    Size
    Dash
    Size
    Flanged Connection
    Surface
    Flange
    OD
    For Bolt
    Dia.
    Dia.
    No.
    Of
    Bolt Circle
    Dia.
    Pressure
    Class
    Material
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Flanged
    1 1/4
    		20Raised6 1/4"7/8"1"44 3/8"1500
    		Steel
    		3,700 psi @ 72° F3,200 psi @ 300° F1139T550000000
     
    back to top