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)
    39 Products

    Locking Drum Plug Caps

    Image of Product. Front orientation. Drum Plug Caps. Male.
    Image of Product. Front orientation. Drum Plug Caps. Female.

    Male

    Female

    Prevent tampering with the contents of your drum while allowing access for filling.
    Pipe
    Size
    Gender
    Dia.
    Ht.
    Lock Type
    Lock
    Included
    For Max. Shackle
    Dia.
    Each
    Iron
    2 NPTMale3 1/8"2 1/4"PadlockableNo7/16"0000000000000
    2 NPTFemale3 1/8"1 3/8"PadlockableNo5/16"000000000000
    3 NPTFemale4 1/2"2"PadlockableNo1/2"000000000000
    4 NPTFemale5 1/4"2 1/4"PadlockableNo1/2"0000000000000
     

    Battery Vent Caps

    Image of Product. Front orientation. Battery Vent Caps.
    Flip open these caps to check the water level and fill a wet-cell lead-acid battery.
    Connection
    Method
    ID
    Material
    Includes
    Dia.
    Ht.
    Pkg.
    Qty.
    Pkg.
    Bayonet1"Polypropylene
    		Rubber Washer1 3/8"1 7/8"6000000000000

    Hinged Caps for Screws

    Image of Product. Front orientation. Protective Caps. Hinged Caps for Screws.
    Flip open for frequent access to screws without misplacing the cap. These conceal screw heads to keep out dirt and prevent snags. To install, insert a screw through the base and close the top.
    Polypropylene—Strong, durable, and won't absorb moisture.
    For Screw Size
    Inside
    Ht.
    OD
    Flexibility
    Max. Temp.,
    ° F
    Choose a Color
    Pkg.
    Qty.
    Pkg.
    Polypropylene
    No. 4, No. 5, No. 6
    		3/32"15/32"Rigid250
    Black
    ,
    White
    		10000000000000000
    No. 6, No. 8, No. 10, M3, M4, M5
    		9/64"9/16"Rigid135
    Beige
    ,
    Dark Blue
    ,
    Dark Brown
    ,
    Dark Green
    ,
    Dark Red
    ,
    Light Brown
    ,
    Light Gray
    ,
    Off-White
    ,
    Silver
    		10000000000000000
    No. 8, No. 10
    		7/64"35/64"Rigid250
    Black
    ,
    White
    		10000000000000000
    1/4"
    		5/32"45/64"Rigid250
    Black
    ,
    White
    		10000000000000000
    3/8"
    		19/64"61/64"Rigid250
    Black
    ,
    White
    		10000000000000000
     

    Lockable Breather Vents with Cap

    Secure access to vented openings in pipe and tanks—the cap can be locked to prevent tampering. These breather vents allow you to add a filling port to your hydraulic tank while protecting against excess pressure and vacuum. Use them to stop debris from entering your tank. Breather vents mount on top of standard tank openings with included hardware. Padlock is not included.
    Threaded NPT Male
    Image of Product. Bottom orientation. Breather Vents. Lockable Breather Vents with Cap, Threaded NPT Male, Aluminum Body.

    Aluminum Body

    Pipe
    Size
    Max.
    Pressure
    Max. Temp.,
    ° F
    Ht.
    Dia.
    For Use With
    Cap
    Material
    Screen
    Material
    For Max. Padlock
    Shackle Dia.
    Each
    Aluminum Body and Fitting
    2
    		Not Rated2004 1/2"5 5/8"Air, Oil, WaterAluminum
    		Stainless Steel
    		3/8"0000000000000
     

    Gas Tank Safety Caps

    Image of Product. Front orientation. Gas Tank Safety Caps.
    Protect the valve of high-pressure gas tanks. The cap fits tanks with and without a regulator.
    For Cylinder
    Size
    Thread
    Size
    Material
    Specs. Met
    Each
    K, T3 1/8"-11
    		SteelD.O.T. Compliant 49 CFR 173.301, OSHA Compliant 29 CFR 1910.25300000000000000

    Tethered Caps

    Image of Product. Front orientation. Protective Caps. Tethered Caps.
    Image of Attribute. Front orientation. Contains Annotated. Tethered Cap.
    A ring connects caps to parts so they don’t get lost when removed. Good for threaded connections you need to access frequently, they block dirt and debris from entering valves, pipe, and tubing.
    Vinyl Plastic—A good all-around choice, these durable caps won’t rip or shred, even with repeated use. They also hold up to oils, mild acids, and solvents. Caps are flexible and conform to parts for a tight fit.
    Tether
    For
    OD
    Inside
    Ht.
    Flexibility
    Max. Temp.,
    ° F
    Color
    Lg.
    Hole
    Dia.
    Pkg.
    Qty.
    Pkg.
    Vinyl Plastic
    1/2"1/2"Flexible200Black1"7/16"10000000000000
    5/8"1/2"Flexible200Black1 1/8"5/8"1000000000000
    3/4"1/2"Flexible200Black1 1/8"3/4"1000000000000
    1"1"Flexible200Black1 3/4"1"1000000000000
    1 1/4"1"Flexible200Black2 1/16"1 5/16"1000000000000
     

    Washdown Plug and Socket Electrical Connector Caps

    Image of Product. Front orientation. Electrical Connector Caps. Washdown Plug and Socket Electrical Connector Caps, For Plugs.
    Image of Product. Front orientation. Electrical Connector Caps. Washdown Plug and Socket Electrical Connector Caps, For Sockets.

    For Plugs

    For Sockets

    Caps can be used with straight-blade and turn-lock plugs and sockets.
    Black
    Yellow
    For
    OD
    Mfr.
    Material
    Enclosure
    Rating
    Mfr. Model
    No.
    Each
    Mfr. Model
    No.
    Each
    For Plugs
    1.9"MolexRubberIP67
    		14WBLK00000000000000014W000000000000000
    2.5"MolexRubberIP67
    		26WBLK0000000000000026W00000000000000
    2.8"MolexRubberIP67
    		28WBLK0000000000000028W00000000000000
     
    For Sockets
    1.9"MolexRubberIP67
    		————050W5000000000000000
    2.5"MolexRubberIP67
    		50W52BLK0000000000000050W5200000000000000
    2.8"MolexRubberIP67
    		50W54BLK0000000000000050W5400000000000000
     

    Gas Cylinder Lockouts

    Prohibit access to the main valve on a gas cylinder. These lockouts secure with a padlock and lockout tag. They help you comply with OSHA 29 CFR 1910.147, which requires handles on pneumatic and hydraulic systems to be locked out during maintenance to prevent injuries.
    Powder-Coated Steel
    Image of ProductInUse. C (Padlock Not Included). Front orientation. Lockouts. Gas Cylinder Lockouts, Style C.
    Image of ProductInUse. C (Shown Open). Front orientation. Lockouts. Gas Cylinder Lockouts, Style C.

    C (Padlock Not

    Included)

    C (Shown Open)

    Steel lockouts are stronger than plastic lockouts. They’re also powder coated for corrosion resistance.
    Style C—Style C fit most high- and low-pressure gas cylinders, including D.O.T. cylinders. When you need to use your cylinder, you can leave these lockouts on—the cover swings up and out of the way when they’re unlocked. To lock out again, snap the cover back on.
    Thread
    Style
    Type
    Spacing
    Direction
    Gender
    For Max. No.
    of Padlocks
    For Max. Padlock
    Shackle Dia.
    Overall
    Lg.
    Max. Temp.,
    ° F
    Color
    Includes
    Specs. Met
    Each
    For Low Pressure Gas Cylinders
    CUNC
    		Coarse
    		Right Hand
    		Female11/4"11"200YellowPadlock
    Three Keys    		OSHA Compliant 29 CFR 1910.147
    		000000000000000
    CUNF
    		Fine
    		Right Hand
    		Female11/4"11"200YellowPadlock
    Three Keys    		OSHA Compliant 29 CFR 1910.147
    		00000000000000
     
    For High Pressure Gas Cylinders
    CUNC
    		Coarse
    		Right Hand
    		Female11/4"11"200YellowPadlock
    Three Keys    		OSHA Compliant 29 CFR 1910.147
    		00000000000000
    CUNF
    		Fine
    		Right Hand
    		Female11/4"11"200YellowPadlock
    Three Keys    		OSHA Compliant 29 CFR 1910.147
    		00000000000000
     

    Hazardous-Location Safe-Break Pin-and-Sleeve Electrical Connector Caps

    Image of Product. Front orientation. Electrical Connector Caps. Hazardous-Location Safe-Break Pin-and-Sleeve Electrical Connector Caps.
    Caps are watertight to protect hazardous location safe-break plugs when not in use.
    For Face
    Dia.
    Mfr.
    Mfr. Model
    No.
    Material
    Color
    Each
    For Plugs
    1.4"Meltric22-1A426NeopreneBlack0000000000000
    1.9"Meltric22-3A426NeopreneBlack000000000000
    2.1"Meltric22-6A426NeopreneBlack000000000000
     

    Safe-Break Pin-and-Sleeve Electrical Connector Caps

    Image of Product. Front orientation. Electrical Connector Caps. Safe-Break Pin-and-Sleeve Electrical Connector Caps.
    Caps are watertight to protect safe-break plugs when not in use.
    For Face
    Dia.
    Mfr.
    Mfr. Model
    No.
    Material
    Color
    Environment
    Enclosure Rating
    Each
    For Plugs
    1.3"Meltric61-1A426NeopreneBlackCorrosive, Dusty, High-Pressure Washdown, Outdoor, Submersible, Washdown, WetIP66, IP67, IP69K, NEMA 4X
    		00000000000000
    1.8"Meltric61-3A426NeopreneBlackCorrosive, Dusty, High-Pressure Washdown, Outdoor, Submersible, Washdown, WetIP66, IP67, IP69K, NEMA 4X
    		0000000000000
    2.2"Meltric61-6A426NeopreneBlackCorrosive, Dusty, High-Pressure Washdown, Outdoor, Submersible, Washdown, WetIP66, IP67, IP69K, NEMA 4X
    		0000000000000
    2.6"Meltric31-6A426NeopreneBlackCorrosive, Dusty, High-Pressure Washdown, Outdoor, Submersible, Washdown, WetIP66, IP67, IP69K, NEMA 4X
    		0000000000000
     
    back to top