McMaster-Carr logo
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    78 Products

    Mini Electrical Connector Caps

    Image of Product. External Thread. Front orientation. Electrical Connector Caps. Mini Electrical Connector Caps, External Thread.
    Image of Product. Internal Thread with Lanyard. Front orientation. Electrical Connector Caps. Mini Electrical Connector Caps, Internal Thread.
    Image of Product. Front orientation. Electrical Connector Caps. Mini Electrical Connector Caps, Internal Thread.

    External

    Thread

    Internal

    Thread with

    Lanyard

    Internal

    Thread

    Protect mini connectors when not in use.
    Thread
    For Face
    Dia.
    Size
    Type
    Material
    Temp. Range,
    ° F
    Includes
    Each
    External Thread
    0.87"1 3/8"-16
    UNS
    Anodized Aluminum-40 to 1900000000000000
     
    Internal Thread
    0.55"7/8"-16
    UNS
    Anodized Aluminum0 to 220Lanyard0000000000000
    0.7"1"-16
    UNS
    Anodized Aluminum0 to 220Lanyard0000000000000
    0.8"1 1/8"-16
    UNS
    Anodized Aluminum0 to 220Lanyard0000000000000
    0.87"1 3/8"-16
    UNS
    Anodized Aluminum-40 to 190000000000000
     

    Mil. Spec. Screw-Together Electrical Connector Caps

    Image of Product. Front orientation. Electrical Connector Caps. Mil. Spec. Screw-Together Electrical Connector Caps, External Thread.

    External Thread

    Image of Product. Front orientation. Electrical Connector Caps. Mil. Spec. Screw-Together Electrical Connector Caps, Internal Thread.

    Internal Thread

    Protect Mil. Spec. connectors when not in use.
    Thread
    Size
    Type
    Material
    Temp. Range,
    ° F
    Each
    External Thread
    5/8"-24
    UNEF
    Cadmium-Plated Aluminum-65 to 2550000000000000
    7/8"-20
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    1"-20
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    1 1/8"-18
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    1 1/4"-18
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    1 3/4"-18
    UNS
    Cadmium-Plated Aluminum-65 to 255000000000000
     
    Internal Thread
    5/8"-24
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    7/8"-20
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    1"-20
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    1 1/8"-18
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    1 1/4"-18
    UNEF
    Cadmium-Plated Aluminum-65 to 255000000000000
    1 3/4"-18
    UNS
    Cadmium-Plated Aluminum-65 to 255000000000000
     

    Metal Round Caps

    Image of Product. Front orientation. Protective Caps. Metal Round Caps.
    Tougher than plastic and rubber caps for best protection from impact and wear. These caps cover pipe ends to prevent damage and keep out dust and debris during shipping and storage.
    Aluminum—Use aluminum caps instead of steel to prevent corrosion from spreading to aluminum pipe and tubing.
    Aluminum
    For OD
    For Pipe
    Size
    Inside
    Ht.
    Flexibility
    Max.
    Temp.
    Each
    35/64"1/4
    7/16"RigidNot Rated0000000000000
    43/64"3/8
    9/16"RigidNot Rated000000000000
    27/32"1/2
    7/16"RigidNot Rated000000000000
    1"23/32"RigidNot Rated000000000000
    1 3/64"3/4
    5/8"RigidNot Rated000000000000
    1 1/4"3/4"RigidNot Rated000000000000
    1 5/16"1
    11/16"RigidNot Rated000000000000
    1 1/2"21/32"RigidNot Rated000000000000
    1 21/32"1 1/4
    13/16"RigidNot Rated000000000000
    1 29/32"1 1/2
    15/16"RigidNot Rated00000000000
    2"1 7/32"RigidNot Rated000000000000
    2 1/4"1 1/16"RigidNot Rated000000000000
    2 3/8"2
    1 1/16"RigidNot Rated00000000000
    2 1/2"1 5/16"RigidNot Rated000000000000
    2 7/8"2 1/2
    1 3/8"RigidNot Rated00000000000
    3"1 1/8"RigidNot Rated000000000000
    3 1/2"3
    1 3/8"RigidNot Rated000000000000
    4"3 1/2
    1 1/2"RigidNot Rated000000000000
    4 1/2"4
    1 7/8"RigidNot Rated000000000000
    5 9/16"5
    1 7/8"RigidNot Rated0000000000000
    6 5/8"6
    1 7/8"RigidNot Rated000000000000

    Screw-In Plugs for Pipe and Tubing

    Threaded for the most secure fit on female pipe and fittings. These plugs protect from damage during shipping and storage. They also keep dust, paint, and coatings from blocking holes and threads.
    For Straight-Thread Fittings
    Image of Product. Front orientation. Contains Annotated. Protective Plugs. Screw In, For Round Holes, For Pipe, For Round Shapes, For Straight-Thread Fittings, Aluminum.

    Aluminum

    Aluminum—Withstand the highest temperatures of all our pipe and tubing plugs. They’re more wear resistant than plastic but won’t hold up as well to chemicals.
    Thread
    Size
    Type
    For Tube
    OD
    Ht.
    Max. Temp.,
    ° F
    Pkg.
    Qty.
    Pkg.
    Aluminum
    5/16"-24
    UNF
    5/32"11/32"650250000000000000
    3/8"-24
    UNF
    3/16"9/32"65025000000000000
    7/16"-20
    UNF
    1/4"9/32"6502500000000000
    1/2"-20
    UNF
    5/16"5/16"6502500000000000
    9/16"-18
    UNF
    3/8"5/16"6502500000000000
    5/8"-18
    UNF
    3/8"5/16"6502500000000000
    3/4"-16
    UNF
    1/2"7/16"65025000000000000
    7/8"-14
    UNF
    5/8"1/2"65025000000000000
    1 1/16"-12
    UN
    3/4"15/32"65025000000000000
    1 5/16"-12
    UN
    1"7/16"65025000000000000
    1 7/8"-12
    UN
    1 1/2"5/8"6505000000000000
     
    For 37° Flared Tube
    Image of Product. Front orientation. Contains Annotated. Protective Plugs. Screw In, For Round Holes, For Pipe, For Round Shapes, For 37° Flared Tube, Aluminum.

    Aluminum

    Aluminum—Withstand the highest temperatures of all our pipe and tubing plugs. They’re more wear resistant than plastic but won’t hold up as well to chemicals.
    Thread
    Size
    Type
    For Tube
    OD
    Ht.
    Max. Temp.,
    ° F
    Pkg.
    Qty.
    Pkg.
    Aluminum
    3/8"-24
    UNF
    3/16"3/8"650250000000000000
    7/16"-20
    UNF
    1/4"15/32"65050000000000000
    1/2"-20
    UNF
    5/16"15/32"65050000000000000
    9/16"-18
    UNF
    3/8"1/2"65050000000000000
    5/8"-18
    UNF
    3/8"1/2"65025000000000000
    3/4"-16
    UNF
    1/2"19/32"65050000000000000
    7/8"-14
    UNF
    5/8"11/16"65025000000000000
    1 1/16"-12
    UN
    3/4"21/32"65025000000000000
    1 5/16"-12
    UN
    1"23/32"65010000000000000
    1 7/8"-12
    UN
    1 1/2"7/8"6505000000000000
     

    Metal Square Plugs

    Image of Product. Front orientation. Contains Annotated. Protective Plugs. Metal Square Plugs.
    Designed to finish off the ends of square metal tubing, these plugs cover rough edges and block dirt and debris. Push into place and then drive with a hammer to secure.
    Aluminum—For aluminum tubing, use these plugs instead of steel to avoid rust that spreads when different metals are in contact.
    For
    Inside
    Head
    Lg.
    Wd.
    Ht.
    Lg.
    Wd.
    Each
    Aluminum
    0.77"0.77"1/2"1"1"0000000000000
    1.02"1.02"5/8"1 1/4"1 1/4"000000000000
    1.27"1.27"13/16"1 1/2"1 1/2"000000000000
    1.77"1.77"3/4"2"2"000000000000
     

    Micro M12 Screw-Together Electrical Connector Caps

    Image of Product. Front orientation. Electrical Connector Caps. Micro M12 Screw-Together Electrical Connector Caps, For Plugs.
    Image of Product. Front orientation. Electrical Connector Caps. Micro M12 Screw-Together Electrical Connector Caps, For Sockets.

    For Plugs

    For Sockets

    Protect M12 connectors when not in use.
    Thread
    Size
    Type
    Location
    Material
    Includes
    Color
    Temp. Range,
    ° F
    Each
    For Plugs
    M12 × 1 mmMetric
    InternalAnodized AluminumLanyardBlack0 to 2200000000000000
    1/2"-20
    UNF
    InternalAnodized AluminumLanyard0 to 220000000000000
     
    For Sockets
    M12 × 1 mmMetric
    ExternalAnodized AluminumBlack0 to 220000000000000
    1/2"-20
    UNF
    ExternalAnodized AluminumGray0 to 220000000000000
     

    Screw-On Caps

    Image of Product. Front orientation. Protective Caps. Screw-On Caps, Aluminum.

    Aluminum

    Thread onto male pipe and fittings for the most secure fit. These caps keep dust, paint, and coatings out of threads and pipe. They also protect from damage during manufacturing, shipping, and storage.
    Aluminum—Use aluminum caps instead of steel to prevent corrosion from spreading to aluminum pipe and tubing.
    Thread
    Size
    Type
    For OD
    Inside
    Ht.
    Flexibility
    Max. Temp.,
    ° F
    Mil. Spec.
    Pkg.
    Qty.
    Pkg.
    Aluminum
     
    For Straight-Thread Fittings
    5/16"-24
    UNF
    5/16"21/64"Rigid650MIL-C-5501/3500000000000000
    3/8"-24
    UNF
    3/8"19/64"Rigid650MIL-C-5501/350000000000000
    7/16"-20
    UNF
    7/16"15/32"Rigid650MIL-C-5501/35000000000000
    1/2"-20
    UNF
    1/2"7/16"Rigid650MIL-C-5501/350000000000000
    9/16"-18
    UNF
    9/16"15/32"Rigid650MIL-C-5501/350000000000000
    5/8"-18
    UNF
    5/8"33/64"Rigid650MIL-C-5501/350000000000000
    3/4"-16
    UNF
    3/4"35/64"Rigid650MIL-C-5501/350000000000000
    7/8"-14
    UNF
    7/8"21/32"Rigid650MIL-C-5501/350000000000000
    1 1/16"-12
    UN
    1 1/16"49/64"Rigid650MIL-C-5501/325000000000000
    1 5/16"-12
    UN
    1 5/16"49/64"Rigid650MIL-C-5501/325000000000000
    1 5/8"-12
    UN
    1 5/8"23/32"Rigid650MIL-C-5501/310000000000000
     
    back to top