McMaster-Carr logo
    Filter by
    System of Measurement
    Pipe Material
    Flanged Connection Surface
    Fitting Material
    Flange Type
    Connects To
    Number of Bolt Holes
    Flange Material
    Thread Type
    Specifications Met
    Gender
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Compare
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    55 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.

    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
    1/2
    1/2
    Flat3 5/8"1/2"5/8"42 3/8"150
    PolypropyleneLight Gray150 psi @ 72° FFDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 615352N11000000
    3/4
    3/4
    Flat4 1/8"1/2"5/8"42 3/4"150
    PolypropyleneLight Gray150 psi @ 72° FFDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 615352N1200000
    1
    1
    Flat4 3/8"1/2"5/8"43 1/8"150
    PolypropyleneLight Gray150 psi @ 72° FFDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 615352N1300000
    1 1/2
    1 1/2
    Flat5 1/4"1/2"5/8"43 7/8"150
    PolypropyleneLight Gray150 psi @ 72° FFDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 615352N1400000
    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 615352N15000000
     
    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
    1/2
    0.119"1 47/64"Polypropylene5381N085000000
    3/4
    0.138"2 1/8"Polypropylene5381N08600000
    1
    0.138"2 31/64"Polypropylene5381N08700000
    1 1/2
    0.195"3 15/64"Polypropylene5381N08800000
    2
    0.178"3 31/32"Polypropylene5381N08900000

    Flame-Retardant PVDF Pipe Flanges for Harsh Chemicals

    Flanges meet UL 94 V-0 for flame retardance to delay the spread of flames to valuable equipment. They are made of PVDF (polyvinylidene fluoride), 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, they have thick, strong walls for heavy duty chemical processing applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line.
    To prevent leaks in threaded connections, apply a sealant to the male threads. Threaded connections can be taken apart as needed for maintenance and repair. For metal threads, use PTFE tape. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns. Flanges meet ASTM D3222 specifications and testing requirements for material quality.
    Warning: Never use plastic pipe fittings, flanges, and pipe with compressed air or gas.
    Flanges
    Image of Product. Front. Front orientation. Pipe and Fittings. Flame-Retardant PVDF Pipe Flanges for Harsh Chemicals, Flanges, Female, Threaded Fitting Connection, Flanged Fitting Connection, Flat Surface.
    Image of Product. Flat Surface on Back. Back orientation. Pipe and Fittings. Flame-Retardant PVDF Pipe Flanges for Harsh Chemicals, Flanges, Female, Threaded Fitting Connection, Flanged Fitting Connection, Flat Surface.
    Image of Product. Raised Surface on Back. Back orientation. Pipe and Fittings. Flame-Retardant PVDF Pipe Flanges for Harsh Chemicals, Flanges, Female, Threaded Fitting Connection, Flanged Fitting Connection, Raised Surface.

    Front

    Flat Surface

    on Back

    Raised

    Surface on

    Back

    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.
    Flammability
    Rating
    Each
    NPT Female
    1/2
    1/2
    Flat3 1/2"1/2"5/8"42 5/16"150
    PVDFRed150 psi @ 72° FUL 94 V-0
    4415K3730000000
    3/4
    3/4
    Flat3 7/8"1/2"5/8"42 11/16"150
    PVDFRed150 psi @ 72° FUL 94 V-0
    4415K374000000
    1
    1
    Flat4 1/4"1/2"5/8"43 1/32"150
    PVDFRed150 psi @ 72° FUL 94 V-0
    4415K375000000
    1 1/2
    1 1/2
    Flat5"1/2"5/8"43 3/4"150
    PVDFRed150 psi @ 72° FUL 94 V-0
    4415K376000000
    2
    2
    Raised6"5/8"3/4"44 3/4"150
    PVDFRed150 psi @ 72° FUL 94 V-0
    4415K377000000
     
    Thread Sealant
    Image of Product. Front orientation. Thread Sealants. Applicator-Top Can.

    Applicator-Top Can

    Sealants cannot be sold to Colorado, Connecticut, District of Columbia, Delaware, Illinois, Indiana, Massachusetts, Maryland, Maine, Michigan, New Hampshire, New Jersey, Northern Virginia, New York, Ohio, Pennsylvania, Rhode Island, or Utah due to local VOC (Volatile Organic Compounds) regulations.
    Container
    Size, fl.
    oz.
    Type
    Temp. Range,
    ° F
    Each
    8Applicator-Top Can-100 to 6004586K9000000

    High-Purity Polypropylene Pipe Stub Ends for Corrosive Chemicals

    Image of Product. Straight Adapter. Front orientation. Pipe Stub Ends. High-Purity Polypropylene Pipe Stub Ends for Corrosive Chemicals.
    Image of Product. Straight Pipe Stub End with Flange. Back orientation. Pipe Stub Ends. High-Purity Polypropylene Pipe Stub Ends for Corrosive Chemicals.

    Straight

    Adapter

    Straight Pipe

    Stub End with

    Flange

    The inside of these pipe stub ends 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 stub ends. These stub ends 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.
    Connect them to pipe with socket fusion welding for a strong, permanent bond. Use a socket fusion welder with a heater bushing (sold separately) that matches your pipe size.
    Pipe stub ends connect flanges to pipe. Slide the straight end into a flange and fuse the stub end to the pipe. Since the flange isn’t fused to the pipe, it can be disconnected easily for cleaning and inspecting.
    Warning: Never use plastic pipe stub ends and pipe with compressed air or gas.
    Pipe Stub Ends
    Flanges
    For Pipe
    Pipe
    Size
    Wall
    Thk.
    Flange
    OD
    Color
    Max. Pressure
    @ Temp.
    For Use With
    Temp. Range,
    ° F
    Specs. Met
    Food Industry Std.
    Standard Dimension
    Ratio
    Material
    For Flange
    Material
    Each
    Each
    Straight Pipe Stub Ends, Female Weld Socket × Flanged
     
    Polypropylene
    1/2
    0.119"1 47/64"Light Gray150 psi @ 72° FDeionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents32 to 200ASTM D2837, ASTM D4101, ISO 7279FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 61SDR11Polypropylene
    Polypropylene
    5381N0850000005352N11000000
    3/4
    0.138"2 1/8"Light Gray150 psi @ 72° FDeionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents32 to 200ASTM D2837, ASTM D4101, ISO 7279FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 61SDR11Polypropylene
    Polypropylene
    5381N086000005352N1200000
    1
    0.138"2 31/64"Light Gray150 psi @ 72° FDeionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents32 to 200ASTM D2837, ASTM D4101, ISO 7279FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 61SDR11Polypropylene
    Polypropylene
    5381N087000005352N1300000
    1 1/2
    0.195"3 15/64"Light Gray150 psi @ 72° FDeionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents32 to 200ASTM D2837, ASTM D4101, ISO 7279FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 61SDR11Polypropylene
    Polypropylene
    5381N088000005352N1400000
    2
    0.178"3 31/32"Light Gray150 psi @ 72° FDeionized Water, Drinking Water, Hydrochloric Acid, Phosphoric Acid, Salt Water, Solvents32 to 200ASTM D2837, ASTM D4101, ISO 7279FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.3297, NSF/ANSI 61SDR11Polypropylene
    Polypropylene
    5381N089000005352N15000000
     
    Accessories for Pipe Stub Ends

    Fiberglass Pipe Flanges for 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 (sold separately) to create an access point within a line. Flanges meet ASTM D4024 specifications and testing requirements for product dimensions, performance, and material quality.
    To connect flanges to pipe, first sand the inside of the flange and the end of the pipe to remove the surface finish. Next, mix the adhesive (sold separately) until the color is uniform with no streaks. Apply a thin layer of mixed adhesive to the sanded area of the pipe, approximately 1/8" thick. Repeat this process with the inside of the flange, applying a layer approximately 1/16" thick. After sealant has been applied, push the flange onto the pipe until it is fully engaged. Make sure you align the bolt holes prior to installing to minimize rotation after the flange is installed. Finally, use the adhesive-curing heat cable (sold separately) to cure the adhesive. Wrap the tape around the pipe and flange at the joint, taking care to not overlap the tape. Once you have waited the full cure time, the pipe and flange will be ready to use.
    Flanges
    Image of Product. Front. Front orientation. Pipe and Fittings. Fiberglass Pipe Flanges for Chemicals, Flanges, Cement Socket Female, Flat Surface.
    Image of Product. Flat Surface on Back. Back orientation. Pipe and Fittings. Fiberglass Pipe Flanges for Chemicals, Flanges, Cement Socket Female, Flat Surface.

    Front

    Flat Surface on Back

    Pipe
    Size
    Bolt
    Hole
    (A)
    (B)
    Flanged Connection
    Surface (B)
    Flange
    OD
    For Bolt
    Dia.
    Dia.
    No.
    Of
    Bolt Circle
    Dia.
    Material
    Color
    Max. Pressure
    @ Temp.
    Each
    Cement Socket Female
    1 1/2
    1 1/2
    Flat5"1/2"5/8"43 7/8"FiberglassBlack300 psi @ 72° F2761N380000000
    2
    2
    Flat6"5/8"3/4"44 3/4"FiberglassBlack250 psi @ 72° F2761N39000000
    3
    3
    Flat7 1/2"5/8"3/4"46"FiberglassBlack250 psi @ 72° F2761N41000000
    4
    4
    Flat9"5/8"3/4"87 1/2"FiberglassBlack150 psi @ 72° F2761N42000000
     
    Pipe Cement
    Blind Flanges
    Image of Product. Front orientation. Pipe and Fittings. Fiberglass Pipe Flanges for Chemicals, Blind Flanges, Flanged, Flat.

    Flanged

    Flat

    Bolt
    Hole
    Pipe
    Size
    Flanged Connection
    Surface
    Flange
    OD
    For Bolt
    Dia.
    Dia.
    No.
    Of
    Bolt Circle
    Dia.
    Material
    Color
    Max. Pressure
    @ Temp.
    Each
    Flanged
    1 1/2
    Flat5"1/2"5/8"43 7/8"FiberglassBlack300 psi @ 72° F2761N340000000
    2
    Flat6"5/8"3/4"44 3/4"FiberglassBlack250 psi @ 72° F2761N35000000
    3
    Flat7 1/2"5/8"3/4"46"FiberglassBlack250 psi @ 72° F2761N36000000
    4
    Flat9"5/8"3/4"87 1/2"FiberglassBlack150 psi @ 72° F2761N37000000
     
    Pipe Cement
    Adhesive-Curing Heat Cable
    Image of Product. Front orientation. Heating Tape.
    Voltage,
    V AC
    Current,
    amp
    Max. Heat
    Output, ° F
    Lg.,
    ft.
    Wd.
    Thk.
    Cord Lg.,
    ft.
    Each
    1201527061"1/8"62905N520000000

    High-Temperature PTFE Pipe Flanges for Harsh Chemicals

    Image of Product. Back. Front orientation. Pipe and Fittings. High-Temperature PTFE Pipe Flanges for Harsh Chemicals.

    Back

    Image of Product. Front. Front orientation. Pipe and Fittings. High-Temperature PTFE Pipe Flanges for Harsh Chemicals.

    Front

    Made of PTFE, these flanges can handle a wider temperature range than any of our other plastic pipe flanges for chemicals. They have the chemical resistance to stand up to acid and solvents. Also known as Pressure Class 150 flanges, they have thick, strong walls for heavy duty industrial applications. The material won’t leach contaminates into the line, so these flanges are commonly used in high-purity processes, such as semiconductor and clean room applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line.
    To prevent leaks in threaded connections, apply a sealant to the male threads. Threaded connections can be taken apart as needed for maintenance and repair. For metal threads, use PTFE tape. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns. Flanges meet ASTM D1710 specifications and testing requirements for material quality.
    Warning: Never use plastic pipe fittings, flanges, and pipe with compressed air or gas.
    Flanges
    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.
    Each
    NPT Female
    1/2
    1/2
    Flat3 1/2"1/2"5/8"42 3/8"150
    PTFEWhite60 psi @ 72° F45375K8110000000
    3/4
    3/4
    Flat3 7/8"1/2"5/8"42 3/4"150
    PTFEWhite50 psi @ 72° F45375K812000000
    1
    1
    Flat4 1/4"1/2"5/8"43 1/8"150
    PTFEWhite35 psi @ 72° F45375K813000000
     
    Thread Sealant
    Image of Product. Front orientation. Thread Sealants. Applicator-Top Can.

    Applicator-Top Can

    Sealants cannot be sold to Colorado, Connecticut, District of Columbia, Delaware, Illinois, Indiana, Massachusetts, Maryland, Maine, Michigan, New Hampshire, New Jersey, Northern Virginia, New York, Ohio, Pennsylvania, Rhode Island, or Utah due to local VOC (Volatile Organic Compounds) regulations.
    Container
    Size, fl.
    oz.
    Type
    Temp. Range,
    ° F
    Each
    8Applicator-Top Can-100 to 6004586K9000000

    High-Purity PVDF Pipe Stub Ends for Corrosive Chemicals

    Image of Product. Straight Adapter. Front orientation. Pipe Stub Ends. High-Purity PVDF Pipe Stub Ends for Corrosive Chemicals.
    Image of Product. Straight Pipe Stub End with Pipe Flange. Back orientation. Pipe Stub Ends. High-Purity PVDF Pipe Stub Ends for Corrosive Chemicals.

    Straight

    Adapter

    Straight

    Pipe

    Stub End

    with

    Pipe

    Flange

    Made of PVDF that’s finished to a 12 Ra smoothness, these pipe stub ends handle some of the harshest chemicals without leaching contaminants into your line. They won’t accumulate particles and are easy to clean, thanks to their smoothness. Comparable to Kynar, these stub ends handle most organic solvents that would dissolve CPVC, and chlorine or nitric acid that would weaken polypropylene. You can use them at higher temperatures than CPVC and polypropylene. These stub ends meet UL 94 V-0 and FM standards for flame retardance. They’re also FDA compliant for direct contact with food, and they meet ASTM requirements for dimensions and tolerances.
    Connect them to pipe with socket fusion welding for a strong, permanent bond. Use a socket fusion welder with a heater bushing (sold separately) that matches your pipe size.
    Pipe stub ends connect flanges to pipe. Slide the straight end into a flange and fuse the stub end to the pipe. Since the flange isn’t fused to the pipe, it can be disconnected easily for cleaning and inspecting.
    Pipe Stub Ends
    Flanges
    For Pipe
    Pipe
    Size
    Wall
    Thk.
    Flange
    OD
    Color
    Max. Pressure
    @ Temp.
    For Use With
    Temp. Range,
    ° F
    Specs.
    Met
    Food Industry Std.
    Flammability
    Rating
    Standard Dimension
    Ratio
    Material
    For Flange
    Material
    Each
    Each
    Straight Pipe Stub Ends, Female Weld Socket × Flanged
     
    PVDF
    1/2
    0.138"1 49/64"White230 psi @ 72° FChlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents-40 to 270ASTM D3261FDA Compliant 21 CFR 177.2510
    FM 4910, UL 94 V-0
    SDR21PVDF
    Polypropylene
    5306N270000005352N11000000
    3/4
    0.158"2 9/32"White230 psi @ 72° FChlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents-40 to 270ASTM D3261FDA Compliant 21 CFR 177.2510
    FM 4910, UL 94 V-0
    SDR21PVDF
    Polypropylene
    5306N280000005352N1200000
    1
    0.177"2 43/64"White230 psi @ 72° FChlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents-40 to 270ASTM D3261FDA Compliant 21 CFR 177.2510
    FM 4910, UL 94 V-0
    SDR21PVDF
    Polypropylene
    5306N290000005352N1300000
    1 1/2
    0.217"3 15/32"White230 psi @ 72° FChlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents-40 to 270ASTM D3261FDA Compliant 21 CFR 177.2510
    FM 4910, UL 94 V-0
    SDR21PVDF
    Polypropylene
    5306N310000005352N1400000
    2
    0.256"4"White230 psi @ 72° FChlorine, Deionized Water, Hydrochloric Acid, Nitric Acid, Oil, Phosphoric Acid, Salt Water, Solvents-40 to 270ASTM D3261FDA Compliant 21 CFR 177.2510
    FM 4910, UL 94 V-0
    SDR21PVDF
    Polypropylene
    5306N320000005352N15000000
     
    Accessories for Pipe Stub Ends
    back to top