McMaster-Carr logo
    Filter by
    Number of Circuits
    Attribute Image
    Mounting Location
    For Wire Gauge
    Industrial Info Compare
    System of Measurement
    Number of Mounting Holes
    Mounting Hole Center-to-Center Length
    Attribute Image
    Current per Circuit
    Number of Terminals per Circuit
    Mounting Hole Center-to-Center Width
    Attribute Image
    For Thermocouple Wire Type
    Industrial Info Compare
    Flammability Rating
    Industrial Info Compare
    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)
    46 Products

    Mounting Location

    Pluggable

    Performance

    Terminal Blocks

    Image of Product. Front orientation. Terminal Blocks. Terminal Blocks.
    Also known as barrier terminal strips, these blocks have dividers to separate live wires and keep your setup tidy. Mount them directly onto control panels, enclosures, and equipment.
    A screw or stud connection creates a tight hold on the wire. You can insert stripped wire directly or attach a terminal to prevent damage from the fastener. Ring, spade, and hook terminals fit around the shank and hang on tightly, even in high-vibration setups. Pin terminals, blade terminals, and wire ferrules are easier to secure with the screw or stud. However, they don't stay put as well as other terminals when vibrated or pulled.
    Covers—Snap onto the top of a terminal block to prevent accidental contact with a live wire. These covers include mounting clips that fit between the block and mounting screws.
    Markers—Label your terminal block connections so you can identify them at a glance. These markers extend from underneath the terminal block.
    Terminal Blocks
    Covers
    Markers
    Mounting
    Holes
    No. of
    Circuits
    For Wire
    Ga.
    Wire
    Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Max. Temp.,
    ° F
    Color
    Dia.
    No.
    of
    Each
    Each
    Each
     
    300V AC/300V DC—20 amp per Circuit
    822 to 12Screw TerminalNo. 6
    		3/8"3 11/16"7/8"1/2"257Black0.17"47527K48000007527K833000007527K15700000
     
    300V AC/300V DC—30 amp per Circuit
    822 to 12Screw TerminalNo. 6
    		7/16"4 1/4"1 1/8"1/2"257Black0.18"47527K68000007527K94300007527K1770000
     
    600V AC/600V DC—20 amp per Circuit
    822 to 12Screw TerminalNo. 6
    		7/16"4 1/4"1 3/8"3/4"257Black0.18"45566T87000005566T627000005566T1170000
     
    600V AC/600V DC—30 amp per Circuit
    814 to 12Screw TerminalNo. 8
    		9/16"5 1/2"1 5/16"11/16"257Black0.22"45566T37000007527K35700005566T3170000
     
    600V AC/600V DC—75 amp per Circuit
    814 to 6Screw TerminalNo. 10
    		11/16"6 11/16"1 13/16"3/4"266Black0.22"45566T52800000———0———0
     
    Accessories for Terminal Blocks
    Jumpers
    Image of Product. Over Barrier Jumper. Front orientation. Terminal Block Jumpers. Terminal Blocks, Over-Barrier Jumper.

    Over

    Barrier

    Jumper

    Image of Product. Around Barrier Jumper. Front orientation. Terminal Block Jumpers. Terminal Blocks, Around-Barrier Jumper.

    Around Barrier

    Jumper

    Over-Barrier Jumper—Fit these jumpers over terminal block dividers to leave free space on the side. They connect adjacent terminals so you can connect multiple components with a single wire.
    Around-Barrier Jumper—These jumpers bend around the divider for a lower profile than over-barrier jumpers. They connect adjacent terminals so you can connect multiple components with a single wire.
    For No. of
    Circuits
    For Terminal Block Voltage
    Pkg.
    Qty.
    Pkg.
    Over-Barrier Jumper
     
    For 3/8" Terminal Center-to-Center
    2300V AC/300V DC257527K59000000
     
    For 7/16" Terminal Center-to-Center
    2300V AC/300V DC257527K7900000
    2600V AC/600V DC15566T260000
     
    For 9/16" Terminal Center-to-Center
    2600V AC/600V DC15566T460000
     
    For 11/16" Terminal Center-to-Center
    2600V AC/600V DC15566T670000
     
    Around-Barrier Jumper
     
    For 3/8" Terminal Center-to-Center
    8300V AC/300V DC17527K9870000
     
    For 7/16" Terminal Center-to-Center
    8300V AC/300V DC/600V AC/600V DC15566T7770000
     
    Quick-Disconnect Adapters
    Image of Product. Straight. Front orientation. Terminal Block Adapters. Straight.

    Straight

    Image of Product. 90° Angle. Front orientation. Terminal Block Adapters. 90° Angle.

    90° Angle

    Image of Product. Front orientation. Terminal Block Adapters. 45° Angle.

    45° Angle

    Convert screw terminal connections into quick-disconnect terminal connections.
    Shape
    For Terminal Block Voltage
    Tab
    Wd.
    Pkg.
    Qty.
    Pkg.
    For 3/8" Terminal Center-to-Center
    Straight300V AC/300V DC0.187"257527K11000000
    90° Angle300V AC/300V DC0.187"257527K5800000
    45° Angle300V AC/300V DC0.187"257527K5700000
     
    For 7/16" Terminal Center-to-Center
    Straight300V AC/300V DC/600V AC/600V DC0.250"257527K1200000
    90° Angle300V AC/300V DC/600V AC/600V DC0.250"257527K7800000
    45° Angle300V AC/300V DC/600V AC/600V DC0.250"257527K7700000
     
    For 9/16" Terminal Center-to-Center
    Straight300V AC/300V DC/600V AC/600V DC0.250"257527K1300000
    90° Angle300V AC/300V DC/600V AC/600V DC0.250"257527K3800000
    45° Angle300V AC/300V DC/600V AC/600V DC0.250"257527K3700000
     

    Touch-Safe Terminal Blocks

    Image of Product. Style A. Front orientation. Terminal Blocks. Touch-Safe Terminal Blocks, Style A, Screw-Clamp-Terminal Wire Connection.
    Image of Product. Style C. Front orientation. Terminal Blocks. Touch-Safe Terminal Blocks, Style C, Screw-Terminal Wire Connection.

    Style A

    Style C

    These terminal blocks protect you from shocks and prevent short circuits. The terminals are recessed in the block, so you can't accidentally touch them when installing or adjusting your wire.
    Screw-Clamp-Terminal Wire Connection—The clamp flattens the wire to resist pullout and vibration better than screw terminals. For an even stronger and more conductive connection, crimp a terminal or wire ferrule onto the end of the wire.
    Mounting
    Holes
    Style
    No. of
    Circuits
    For Wire
    Ga.
    Wire Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Max. Temp.,
    ° F
    Color
    Dia.
    No.
    of
    Each
     
    600V AC/600V DC—20 amp per Circuit
    A822 to 12Screw-Clamp TerminalM3
    		5/16"2 7/16"3/4"3/4"221White0.12"77618K61500000
     
    600V AC/600V DC—30 amp per Circuit
    A818 to 10Screw-Clamp TerminalM3
    		3/8"3"3/4"13/16"221White0.15"77618K6350000
     
    600V AC/600V DC—40 amp per Circuit
    A820 to 8Screw-Clamp TerminalM3
    		1/2"3 5/8"15/16"7/8"221White0.17"77618K6550000
     
    600V AC/600V DC—63 amp per Circuit
    A814 to 6Screw-Clamp TerminalM3
    		9/16"4 1/2"1 1/8"1 1/16"221White0.17"77618K6750000
     
    600V AC/600V DC—85 amp per Circuit
    C818 to 4Screw Terminal1/4"
    		5/8"4 15/16"1 1/4"1 1/8"302Black0.18"79130K4600000
     

    Space-Saving Terminal Blocks

    Image of Product. Front orientation. Terminal Blocks. Space-Saving Terminal Blocks.
    These single-row terminal blocks connect the same number of circuits as double-row blocks, but in a narrower footprint. Also known as barrier terminal strips, they have dividers to separate live wires and keep your setup tidy. Mount them directly onto control panels, enclosures, and equipment.
    You can screw down your stripped wire directly or attach a terminal to prevent damage from the screw. Ring, spade, and hook terminals fit around the screw and hang on tightly, even in high-vibration setups. Pin terminals, blade terminals, and wire ferrules are easier to slip under the screw head, but they don't stay put as well as other terminals when vibrated or pulled.
    Note: Stick the included insulation strip to the bottom of the block before installing. The voltage listed applies only when the strip is attached.
    Mounting
    Holes
    No. of
    Circuits
    For Wire
    Ga.
    Wire
    Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Max. Temp.,
    ° F
    Color
    Dia.
    No.
    of
    Each
     
    150V AC/150V DC—15 amp per Circuit
    822 to 16Screw TerminalNo. 5
    		3/8"3 11/16"9/16"7/16"302Black0.17"28173T14000000
     
    600V AC/600V DC—30 amp per Circuit
    814 to 12Screw TerminalNo. 8
    		9/16"5 1/2"3/4"3/4"302Black0.21"28173T5400000
     

    Terminal Blocks for Thermocouples

    Image of Product. Bottom orientation. Terminal Blocks. Terminal Blocks for Thermocouples.
    Unlike other terminal blocks, these blocks connect to thermocouple wire without distorting or destroying the signal. The metal in each terminal matches the metal of a specific thermocouple wire type. The ends of the blocks are labeled positive or negative so you know which end of the wire to attach.
    Also known as a barrier strip, this type of terminal block has dividers to separate live wires and keep your setup tidy. Mount the blocks directly onto control panels, enclosures, and equipment. The screw-clamp terminals flatten your wire so it stays put when vibrated or pulled.
    Mounting
    Holes
    No. of
    Circuits
    No. of Terminals
    per Circuit
    For Wire
    Ga.
    Wire Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Max. Temp.,
    ° F
    Color
    Dia.
    No.
    of
    Each
    For J Thermocouple Wire Type
     
    250V AC—20 amp per Circuit
    8416 to 14Screw-Clamp TerminalNo. 6
    		7/16"7 3/4"1 1/8"1/2"300Black0.17"47882N21000000
     
    For K Thermocouple Wire Type
     
    250V AC—20 amp per Circuit
    8416 to 14Screw-Clamp TerminalNo. 6
    		7/16"7 3/4"1 1/8"1/2"300Black0.17"47882N2200000
     
    For T Thermocouple Wire Type
     
    250V AC—20 amp per Circuit
    8416 to 14Screw-Clamp TerminalNo. 6
    		7/16"7 3/4"1 1/8"1/2"300Black0.17"47882N2300000
     

    Space-Saving Circuit Board Terminal Blocks

    Image of Product. Front orientation. Terminal Blocks. Space-Saving Circuit Board Terminal Blocks.
    Streamline wiring on small or crowded circuit boards. These terminal blocks connect the same number of circuits as larger blocks in about half the space. Pins on the bottom are spaced to match the layout of circuit boards. Solder them onto your board for a secure hold.
    The screw-clamp terminals flatten your wire so it stays put when vibrated or pulled. For an even stronger and more conductive connection, crimp a terminal or wire ferrule onto the end of the wire.
    Pin
    No. of
    Circuits
    For Wire
    Ga.
    Wire Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Lg.
    Material
    Max. Temp.,
    ° F
    Color
    Pkg.
    Qty.
    Pkg.
     
    300V AC—15 amp per Circuit
    822 to 12Screw-Clamp TerminalM3
    		3/16"1 5/8"3/8"9/16"0.12"Tin-Plated Nickel220Black55747N16000000
     

    Plug-and-Socket Circuit Board Terminal Blocks

    Image of Product. Plug. Front orientation. Terminal Blocks. Plug-and-Socket Circuit Board Terminal Blocks, Plugs, Screw-Clamp-Terminal Wire Connection.
    Image of Product. Socket. Front orientation. Terminal Blocks. Plug-and-Socket Circuit Board Terminal Blocks, Sockets.

    Plug

    Socket

    Cut power with the pull of a plug when you need to swap out equipment or adjust your circuit. You can wire the plug away from the terminal block, then pop it into the socket you've already installed. Pins on the bottom of these blocks are spaced to match the layout of circuit boards. Solder them onto your board for a secure hold. You'll need one plug and one socket for a complete terminal block.
    The screw-clamp terminals flatten your wire so it stays put when vibrated or pulled. For an even stronger and more conductive connection, crimp a terminal or wire ferrule onto the end of the wire.
    Pin
    No. of
    Circuits
    For Wire
    Ga.
    Wire Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Lg.
    Material
    Max. Temp.,
    ° F
    Color
    Pkg.
    Qty.
    Pkg.
    Plugs
     
    300V AC—18 amp per Circuit
    826 to 12Screw-Clamp TerminalM3
    		3/16"1 5/8"1/2"11/16"——220Black55701N19000000
     
    Sockets
     
    300V AC—18 amp per Circuit
    8———3/16"1 11/16"5/16"1/2"0.13"Tin-Plated Nickel220Black55701N1400000
     

    Touch-Safe Plug-and-Socket Terminal Blocks

    Image of Product. Plug. Front orientation. Terminal Blocks. Touch-Safe Plug-and-Socket Terminal Blocks, Plugs, Screw-Terminal Wire Connection.
    Image of Product. Socket. Front orientation. Terminal Blocks. Touch-Safe Plug-and-Socket Terminal Blocks, Sockets, Screw-Terminal Wire Connection.

    Plug

    Socket

    These terminal blocks cut power when you pull the plug while protecting you from shocks. The terminals are recessed, so you can't accidentally touch them when installing or adjusting wire. You can wire the plug away from the block, then attach it to the socket you've already installed. Blocks can be cut into smaller sections. You'll need one plug and one socket for a complete terminal block.
    You can screw down your stripped wire directly or attach a terminal to prevent damage from the screw. Ring, spade, and hook terminals fit around the screw and hang on tightly, even in high-vibration setups. Pin terminals, blade terminals, and wire ferrules are easier to fit into the block, but they don't stay put as well as other terminals when vibrated or pulled.
    Mounting
    Holes
    No. of
    Circuits
    For Wire
    Ga.
    Wire
    Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Max. Temp.,
    ° F
    Color
    Dia.
    No.
    of
    Each
    Plugs
     
    600V AC/600V DC—20 amp per Circuit
    824 to 10Screw TerminalM3
    		3/8"3"9/16"3/4"221White0.12"781905K1400000
     
    Sockets
     
    600V AC/600V DC—20 amp per Circuit
    824 to 10Screw TerminalM3
    		3/8"3"13/16"3/4"221White0.14"781905K240000
     

    Circuit Board Terminal Blocks

    Image of Product. Bottom orientation. Terminal Blocks. Circuit Board Terminal Blocks.
    Pins on the bottom of these terminal blocks are spaced to match the layout of circuit boards. Solder them onto your board for a secure hold.
    The screw-clamp terminals flatten your wire so it stays put when vibrated or pulled. For an even stronger and more conductive connection, crimp a terminal or wire ferrule onto the end of the wire.
    Over-Barrier Jumpers—Fit these jumpers over terminal block dividers to leave free space on the side. They connect adjacent terminals so you can connect multiple components with a single wire.
    Terminal Blocks
    Over-Barrier Jumpers
    Pin
    No. of
    Circuits
    For Wire
    Ga.
    Wire Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Lg.
    Material
    Max. Temp.,
    ° F
    Color
    Each
    Pkg.
    Qty.
    Pkg.
     
    300V AC/300V DC—25 amp per Circuit
    822 to 12Screw-Clamp TerminalNo. 6
    		3/8"3 1/16"5/8"11/16"0.19"Tin-Plated Brass230Black8076K1800000508076K29000000
     
    back to top