McMaster-Carr logo
    Filter by
    System of Measurement
    Pipe Schedule
    Industrial Info Snippet
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    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)
    23,533 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.

    Premium Low-Pressure Stainless Steel Threaded Pipe Fittings

    Unlike other stainless steel fittings, these are cast in the U.S. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings except plugs adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 150 low-pressure stainless steel fittings. They also meet either ASTM A351 or A479 requirements for parts that will be used in pressure systems. These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Straight Connectors
    Image of Product. Female. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, Straight Connectors, Threaded Fitting Connection, Female.

    Female

    304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    304
    Stainless Steel
    316
    Stainless Steel
    Pipe
    Size
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Each
    NPT Female
    1 1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A15900000090697A159000000
    2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1610000090697A16100000
    3
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A16200000090697A162000000
    4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A16300000090697A163000000
     
    Straight Adapters
    Image of Product. Female x Butt Weld. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, Straight Adapters, Female, Butt-Weld Fitting Connection, Threaded Fitting Connection.

    Female x Butt

    Weld

    Threaded Fitting Connection—Threaded female x butt weld straight adapters are also known as half couplings.
    304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    Pipe
    Size
    304
    Stainless Steel
    316
    Stainless Steel
    (A)
    (B)
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Each
    NPT Female × Butt Weld
    1 1/2
    		1 1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A16400000090697A164000000
    2
    		2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1650000090697A16500000
    3
    		3
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A16600000090697A166000000
    4
    		4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A16700000090697A167000000
     
    90° Elbow Connectors
    Image of Product. Female. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, 90° Elbow Connectors, Threaded Fitting Connection, Female.

    Female

    304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    304
    Stainless Steel
    316
    Stainless Steel
    Pipe
    Size
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Each
    NPT Female
    1/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A10100000090697A101000000
    3/8
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1020000090697A10200000
    1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1030000090697A10300000
    3/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1040000090697A10400000
    1
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1050000090697A10500000
    1 1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1060000090697A10600000
    2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1070000090697A10700000
    3
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A10800000090697A108000000
    4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A10900000090697A109000000
     
    90° Elbow Adapters
    Image of Product. Female x Male. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, 90° Elbow Adapters, Male, Female, Threaded Fitting Connection.

    Female x

    Male

    Female x male 90° elbow adapters are also known as street elbows.
    304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    Pipe
    Size
    304
    Stainless Steel
    316
    Stainless Steel
    (A)
    (B)
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Each
    NPT Female × NPT Male
    1/4
    		1/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A11900000090697A119000000
    3/8
    		3/8
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1210000090697A12100000
    1/2
    		1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1220000090697A12200000
    3/4
    		3/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1230000090697A12300000
    1
    		1
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1240000090697A12400000
    1 1/2
    		1 1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1250000090697A12500000
    2
    		2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1260000090697A12600000
    3
    		3
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A12700000090697A127000000
    4
    		4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A12800000090697A128000000
     
    45° Elbow Connectors
    Image of Product. Female. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, 45° Elbow Connectors, Threaded Fitting Connection, Female.

    Female

    304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    304
    Stainless Steel
    316
    Stainless Steel
    Pipe
    Size
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Each
    NPT Female
    1/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A11100000090697A111000000
    3/8
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1120000090697A11200000
    1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1130000090697A11300000
    3/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1140000090697A11400000
    1
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1150000090697A11500000
    1 1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1160000090697A11600000
    2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1170000090697A11700000
    3
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A11800000090697A118000000
     
    Tee Connectors
    Image of Product. Female. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, Tee Connectors, Threaded Fitting Connection, Female.

    Female

    304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    304
    Stainless Steel
    316
    Stainless Steel
    Pipe
    Size
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Each
    NPT Female
    1/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A12900000090697A129000000
    3/8
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1310000090697A13100000
    1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1320000090697A13200000
    3/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1330000090697A13300000
    1
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1340000090697A13400000
    1 1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1350000090697A13500000
    2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A13600000090697A136000000
    3
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A13700000090697A137000000
    4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A13800000090697A138000000
     
    Cross Connectors
    Image of Product. Female. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, Cross Connectors, Threaded Fitting Connection, Female.

    Female

    304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    304
    Stainless Steel
    316
    Stainless Steel
    Pipe
    Size
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Each
    NPT Female
    1/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A13900000090697A139000000
    3/8
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1410000090697A14100000
    1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1420000090697A14200000
    3/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1430000090697A14300000
    1
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1440000090697A14400000
    1 1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1450000090697A145000000
    2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A14600000090697A146000000
    3
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A14700000090697A147000000
    4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A14800000090697A148000000
     
    Caps
    Image of Product. Female. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, Caps, Threaded Fitting Connection, Female.

    Female

    304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    304
    Stainless Steel
    316
    Stainless Steel
    Pipe
    Size
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    Each
    NPT Female
    1/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A14900000090697A149000000
    3/8
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1510000090697A15100000
    1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1520000090697A15200000
    Premium Low-Pressure 304 Stainless Steel Pipe Fitting with Certificate, Cap, 1/2 NPT Female
    EachIn stock
    3/4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1530000090697A15300000
    1
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1540000090697A15400000
    1 1/2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1550000090697A15500000
    2
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1560000090697A15600000
    3
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A1570000090697A15700000
    4
    		150
    		300 psi @ 72° F150 psi @ 350° F90691A15800000090697A158000000
     
    Hex-Drive Plugs
    Image of Product. Male. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, Hex-Drive Plugs, Male, Threaded Fitting Connection.

    Male

    NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    316 Stainless Steel
    Pipe
    Size
    Pressure
    Class
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    NPTF Male
    1/4
    		150
    		270 psi @ 72° F150 psi @ 350° F5288N4500000
    3/8
    		150
    		270 psi @ 72° F150 psi @ 350° F5288N460000
    1/2
    		150
    		270 psi @ 72° F150 psi @ 350° F5288N470000
    3/4
    		150
    		270 psi @ 72° F150 psi @ 350° F5288N4800000
    1
    		150
    		270 psi @ 72° F150 psi @ 350° F5288N4900000
    1 1/4
    		150
    		270 psi @ 72° F150 psi @ 350° F5288N5100000
    1 1/2
    		150
    		270 psi @ 72° F150 psi @ 350° F5288N5200000
    2
    		150
    		270 psi @ 72° F150 psi @ 350° F5288N5300000
     
    External-Hex-Drive Plugs
    Image of Product. Male. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, External-Hex-Drive Plugs, Male, Threaded Fitting Connection, Hex Body.

    Male

    NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    316 Stainless Steel
    Pipe
    Size
    Construction
    Pressure
    Class
    Body
    Shape
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    NPTF Male
    1/4
    		Solid150
    		Hex270 psi @ 72° F150 psi @ 350° F5288N3600000
    3/8
    		Solid150
    		Hex270 psi @ 72° F150 psi @ 350° F5288N370000
     
    External-Square-Drive Plugs
    Image of Product. Male. Front orientation. Pipe and Fittings. Premium Low-Pressure Stainless Steel Threaded Pipe Fittings, External-Square-Drive Plugs, Male, Threaded Fitting Connection, Square Body.

    Male

    NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.
    316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.
    316 Stainless Steel
    Pipe
    Size
    Construction
    Pressure
    Class
    Body
    Shape
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    Each
    NPTF Male
    1/4
    		Solid150
    		Square270 psi @ 72° F150 psi @ 350° F5288N2700000
    3/8
    		Solid150
    		Square270 psi @ 72° F150 psi @ 350° F5288N280000
     
    back to top
    Other Pipe and Fittings
    Stainless Steel Threaded Pipe and Fittings
    Plastic Pipe and Fittings
    Iron and Steel Threaded Pipe and Fittings
    Brass and Bronze Threaded Pipe and Fittings
    Galvanized Iron and Steel Threaded Pipe and Fittings
    Aluminum Threaded Pipe and Fittings
    Stainless Steel Unthreaded Pipe and Fittings
    Aluminum Unthreaded Pipe and Fittings
    Iron and Steel Unthreaded Pipe and Fittings
    Drain, Waste, and Vent Pipe and Fittings