McMaster-Carr logo
    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)
    Help me decide (beta)
    55 Products

    Conduit Locknuts

    Secure threaded conduit fittings to knockouts. These locknuts keep fittings from shifting, so connections stay stable and wiring is protected inside electrical boxes or enclosures.
    For Metal and Plastic Fittings
    Image of Product. Locknut with PVC Molded Gasket. Front orientation. Conduit and Fittings. Conduit Locknuts, For Metal and Plastic Fittings, PVC Molded Gasket.

    Locknut with

    PVC Molded

    Gasket

    Zinc-Plated Steel—The strength of steel with a plating that protects from occasional exposure to moisture.
    PVC Molded Gasket—Creates a seal for moisture protection.
    Pipe
    Size
    Features
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    NPSM Thread
     
    Zinc-Plated Steel
    1/2
    		PVC Molded GasketCSA Certified, UL Listed27513K31100000
    3/4
    		PVC Molded GasketCSA Certified, UL Listed27513K3120000
    1
    		PVC Molded GasketCSA Certified, UL Listed27513K3130000
    1 1/4
    		PVC Molded GasketCSA Certified, UL Listed27513K3140000
    1 1/2
    		PVC Molded GasketCSA Certified, UL Listed27513K3150000
    2
    		PVC Molded GasketCSA Certified, UL Listed27513K31600000
    2 1/2
    		PVC Molded GasketCSA Certified
    		17513K11500000
    3
    		PVC Molded GasketCSA Certified
    		17513K11600000
    3 1/2
    		PVC Molded GasketCSA Certified
    		17513K11700000
     
    Conduit Locknut and Reaming Pliers
    Image of Product. Front orientation. Conduit Locknut and Reaming Pliers.
    Tighten locknuts and ream both the inside and outside of conduit with one tool. These pliers have combination jaws with multiple curved openings to work with 1/2" (13 mm) and 3/4" (19 mm) EMT conduit locknuts and 1/2" rigid conduit locknuts and flat nuts. Their machined nose fits snugly into locknut wings. They can also pull wire and fish tape, thanks to their serrated jaws. Pliers have plastic grips for comfort.
    Jaw
    Overall
    Lg.
    Max.
    Cap.
    Lg.
    Opening
    Style
    Texture
    Material
    For Tape
    Shape
    With Wire
    Cutter
    Each
    Combination Jaw and Cushion Grip
    7 3/4"1 3/8"1 5/8"ManualSerratedSteel
    		FlatNo4642N11000000
     

    Metric Stainless Steel Hex Sealing Nuts

    Image of Product. Bottom orientation. Sealing Nuts. Metric Stainless Steel Hex Sealing Nuts.
    Made of stainless steel, these metric nuts have good chemical resistance and may be mildly magnetic. They have a silicone seal that prevents leaks and seals out contaminants.
    Thread Size
    Wd.,
    mm
    Ht.,
    mm
    Max. Pressure,
    psi
    Seal Temp.
    Range, ° F
    Specs.
    Met
    Each
    18-8 Stainless Steel
    M3 × 0.5 mm62.86,000-100 to 400UL 508A90448A11000000
    M4 × 0.7 mm73.26,000-100 to 400UL 508A90448A1200000
    M5 × 0.8 mm846,000-100 to 400UL 508A90448A1300000
    M6 × 1 mm1056,000-100 to 400UL 508A90448A1400000
    M8 × 1.25 mm136.36,000-100 to 400UL 508A90448A15000000
    M10 × 1.5 mm1786,000-100 to 400UL 508A90448A16000000
     

    Stainless Steel Hex Sealing Nuts

    Image of Product. Front orientation. Sealing Nuts. Stainless Steel Hex Sealing Nuts.
    These nuts have good chemical resistance and may be mildly magnetic. They have a molded silicone seal that prevents leaks and seals out contaminants. They meet UL 50 for use on enclosures.
    Thread
    Size
    Wd.
    Ht.
    Max. Pressure,
    psi
    Seal Temp.
    Range, ° F
    Specs.
    Met
    Each
    18-8 Stainless Steel
    6-32
    		5/16"9/64"6,000-100 to 400UL 5091339A11000000
    8-32
    		3/8"5/32"6,000-100 to 400UL 5091339A1150000
    10-24
    		3/8"5/32"6,000-100 to 400UL 5091339A1250000
    10-32
    		3/8"5/32"6,000-100 to 400UL 5091339A1200000
    1/4"-20
    		7/16"7/32"6,000-100 to 400UL 5091339A1300000
    1/4"-28
    		7/16"7/32"6,000-100 to 400UL 5091339A1350000
    5/16"-18
    		1/2"17/64"6,000-100 to 400UL 5091339A1400000
    5/16"-24
    		1/2"17/64"6,000-100 to 400UL 5091339A1450000
    3/8"-16
    		9/16"21/64"6,000-100 to 400UL 5091339A1500000
    3/8"-24
    		9/16"21/64"6,000-100 to 400UL 5091339A1550000
    7/16"-20
    		11/16"3/8"6,000-100 to 400UL 5091339A1600000
    1/2"-13
    		3/4"27/64"6,000-100 to 400UL 5091339A1650000
    1/2"-20
    		3/4"27/64"6,000-100 to 400UL 5091339A1700000
    5/8"-18
    		15/16"35/64"6,000-100 to 400UL 5091339A1750000
     

    Extreme-Pressure Stainless Steel Threaded Pipe Locknuts

    Image of Product. Front orientation. Pipe Locknuts. Extreme-Pressure Stainless Steel Threaded Pipe Locknuts.
    With the strength to handle extreme pressures, these locknuts can be used to connect equipment in hydraulic fluid lines.
    Locknuts have a gasket, which creates a tight seal without the need for PTFE tape; screw one onto the male end of a fitting for extra holding power.
    303 Stainless Steel—303 stainless steel locknuts have very good corrosion resistance.
    303
    Stainless Steel
    Pipe
    Size
    Dash
    Size
    Hex
    Wd.
    Lg.
    Gasket
    Material
    Max. Pressure
    @ Temp.
    For Use With
    Temp. Range,
    ° F
    Each
    NPT Female
    1/8
    		025/8"3/16"PTFE
    		10,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K37000000
    1/4
    		043/4"9/32"PTFE
    		10,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K3800000
    3/8
    		067/8"9/32"PTFE
    		10,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K3900000
    1/2
    		081 1/8"19/64"PTFE
    		10,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K4400000
    3/4
    		121 5/16"19/64"PTFE
    		5,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K45000000
    1
    		161 5/8"25/64"PTFE
    		5,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K46000000
    1 1/4
    		202"25/64"PTFE
    		5,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K47000000
    1 1/2
    		242 1/4"25/64"PTFE
    		3,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K48000000
    2
    		322 3/4"27/64"PTFE
    		3,000 psi @ 72° FAir, Hydraulic Fluid, Natural Gas, Oil, Water-300 to 5005530K49000000
     

    Extreme-Pressure Steel Threaded Pipe Locknuts

    Image of Product. Front orientation. Pipe Locknuts. Extreme-Pressure Steel Threaded Pipe Locknuts.
    The strongest steel locknuts we offer, these can withstand extreme-pressure applications.
    Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
    For Pipe
    For
    Flange
    Pipe
    Size
    Dash
    Size
    Hex
    Wd.
    Lg.
    Gasket
    Material
    Max. Pressure
    @ Temp.
    Max. Steam Pressure
    @ Temp.
    For Use With
    Temp. Range,
    ° F
    Material
    Fabrication
    Schedule
    Material
    Class
    Material
    Each
    NPT Female
    1/8
    		025/8"3/16"PTFE
    		10,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K14000000
    1/4
    		043/4"9/32"PTFE
    		10,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K1600000
    3/8
    		067/8"9/32"PTFE
    		10,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K1800000
    1/2
    		081 1/8"19/64"PTFE
    		10,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K1900000
    3/4
    		121 5/16"19/64"PTFE
    		5,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K2100000
    1
    		161 5/8"25/64"PTFE
    		5,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K2300000
    1 1/4
    		202"25/64"PTFE
    		5,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K2500000
    1 1/2
    		242 1/4"25/64"PTFE
    		3,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K2700000
    2
    		322 3/4"27/64"PTFE
    		3,000 psi @ 72° F5,000 psi @ 500° FAir, Hydraulic Fluid, Natural Gas, Oil, Steam, Water-100 to 500Zinc-Yellow-Chromate-Plated SteelMachinedXXH
    		Steel1500
    		Steel5530K29000000
     

    Brass Hex Sealing Nuts

    Image of Product. Front orientation. Sealing Nuts. Brass Hex Sealing Nuts.
    These nickel-plated brass sealing nuts have good resistance to chemicals and salt water. A nickel plating provides additional corrosion resistance and a decorative metallic finish. They have a silicone seal that prevents leaks and seals out contaminants. All meet UL 50 for use on enclosures. Nuts are nonmagnetic.
    Thread
    Size
    Wd.
    Ht.
    Max. Pressure,
    psi
    Seal Temp.
    Range, ° F
    Specs.
    Met
    Each
    Nickel-Plated Brass
    6-32
    		1/2"7/32"6,000-100 to 400UL 5090215A01000000
    8-32
    		1/2"7/32"6,000-100 to 400UL 5090215A4100000
    10-24
    		1/2"7/32"6,000-100 to 400UL 5090215A0110000
    10-32
    		1/2"7/32"6,000-100 to 400UL 5090215A4110000
    1/4"-28
    		5/8"7/32"6,000-100 to 400UL 5090215A4290000
    3/8"-16
    		5/8"7/32"6,000-100 to 400UL 5090215A0310000
    3/8"-24
    		5/8"7/32"6,000-100 to 400UL 5090215A4310000
     
    back to top