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)
    36 Products

    Mounting Location

    Mounting Location

    Quick-Connect Terminal Blocks

    Image of Product. Front orientation. Terminal Blocks. Quick-Connect Terminal Blocks.
    Snap wire into place with a clamp instead of fussing with a screw. Release the spring clamp with a screwdriver, insert the wire, and push the clamp back down for a secure hold. For an easier fit in the small gaps in the block, attach a ferrule, pin terminal, or blade terminal before installing.
    DIN Rail Mounting Adapters—Install terminal blocks on DIN 3 rail with these mounting brackets. You can mount two-circuit terminal blocks with one adapter. For all other blocks, you'll need two.
    Terminal Blocks
    DIN Rail
    Mounting Adapters
    Mounting
    Holes
    Black
    White
    No. of
    Circuits
    No. of Terminals
    per Circuit
    For Wire
    Ga.
    Wire Connection
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Max. Temp.,
    ° F
    For DIN Rail
    Trade Size
    Dia.
    No.
    of
    Each
    Each
    Each
    5420 to 12Spring-Clamp Terminal1/2"2 3/8"7/8"1 3/8"22130.13"400000000000000000000000000000000000

    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
    522 to 12Screw TerminalNo. 6
    		3/8"2 1/2"7/8"1/2"257Black0.17"400000000000000000000000000000000000000
     
    300V AC/300V DC—30 amp per Circuit
    522 to 12Screw TerminalNo. 6
    		7/16"2 15/16"1 1/8"1/2"257Black0.18"400000000000000000000000000000000000
     
    600V AC/600V DC—20 amp per Circuit
    522 to 12Screw TerminalNo. 6
    		7/16"2 15/16"1 3/8"3/4"257Black0.18"400000000000000000000000000000000000
     
    600V AC/600V DC—30 amp per Circuit
    514 to 12Screw TerminalNo. 8
    		9/16"3 13/16"1 5/16"11/16"257Black0.22"4000000000000000000000000000000000000
     
    600V AC/600V DC—75 amp per Circuit
    514 to 6Screw TerminalNo. 10
    		11/16"4 9/16"1 13/16"3/4"266Black0.22"40000000000000———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 DC250000000000000
     
    For 7/16" Terminal Center-to-Center
    2300V AC/300V DC25000000000000
    2600V AC/600V DC100000000000
     
    For 9/16" Terminal Center-to-Center
    2600V AC/600V DC100000000000
     
    For 11/16" Terminal Center-to-Center
    2600V AC/600V DC100000000000
     
    Around-Barrier Jumper
     
    For 3/8" Terminal Center-to-Center
    5300V AC/300V DC1000000000000
     
    For 7/16" Terminal Center-to-Center
    5300V AC/300V DC/600V AC/600V DC1000000000000
     
    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. 45° Angle. 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"250000000000000
    90° Angle300V AC/300V DC0.187"25000000000000
    45° Angle300V AC/300V DC0.187"25000000000000
     
    For 7/16" Terminal Center-to-Center
    Straight300V AC/300V DC/600V AC/600V DC0.250"25000000000000
    90° Angle300V AC/300V DC/600V AC/600V DC0.250"25000000000000
    45° Angle300V AC/300V DC/600V AC/600V DC0.250"25000000000000
     
    For 9/16" Terminal Center-to-Center
    Straight300V AC/300V DC/600V AC/600V DC0.250"25000000000000
    90° Angle300V AC/300V DC/600V AC/600V DC0.250"25000000000000
    45° Angle300V AC/300V DC/600V AC/600V DC0.250"25000000000000
     

    Enclosure-Mounted Quick-Connect Terminal Blocks

    Image of Product. Front orientation. Terminal Blocks. Enclosure-Mounted Quick-Connect Terminal Blocks.
    Instead of fussing with screws, use a screwdriver to lift and release the clamp onto your wire. The spring clamps flatten your wire so it stays put when when vibrated or pulled.
    These terminal blocks come mounted in an enclosure that you can pop directly onto walls or equipment. They also reduce hassle because you can wire your circuits before installing the enclosure. Enclosures protect the terminal blocks from water, oil, and corrosion. Knockouts make it easy to run wire in and out of the enclosure.
    Polycarbonate—Tough yet lightweight, these enclosures shield terminal blocks from incidental knocks on busy worksites.
    Knockouts
    Mounting
    Holes
    White
    No. of
    Circuits
    No. of Terminals
    per Circuit
    Current per
    Circuit, amp
    Voltage
    For Wire
    Ga.
    Wire Connection
    Ht.
    Wd.
    Dp.
    No.
    of
    Dia.
    Dia.
    No.
    of
    Enclosure
    Rating
    Terminal
    Ctr.-to-Ctr.
    Each
    Center Terminal Block
     
    Polycarbonate
    5235600V AC/600V DC22 to 8Spring-Clamp Terminal3 3/16"3 1/4"3 3/8"20.7"0.16"4IP65, NEMA 4X
    		5/16"0000000000000
     

    Touch-Safe Terminal Blocks

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

    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.
    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—85 amp per Circuit
    C518 to 4Screw Terminal1/4"
    		5/8"3"1 1/4"1 1/8"302Black0.18"40000000000000
     

    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
    522 to 12Screw-Clamp TerminalM3
    		3/16"1"3/8"9/16"0.12"Tin-Plated Nickel220Black100000000000000
     

    Through-Panel Terminal Blocks

    Image of Product. Front orientation. Terminal Blocks. Through-Panel Terminal Blocks.
    Mount these terminal blocks in a panel cutout to connect components on opposite sides. 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.
    For Panel
    Cutout
    Mounting
    Holes
    No. of
    Circuits
    For Wire
    Ga.
    Wire Connection
    Terminal
    Size
    Terminal
    Ctr.-to-Ctr.
    Lg.
    Wd.
    Ht.
    Lg.
    Ht.
    Max. Temp.,
    ° F
    Color
    Dia.
    No.
    of
    Each
    600V AC/600V DC—60 amp per Circuit
    510 to 3Screw-Clamp TerminalM5
    		5/8"4 5/16"1 13/16"1 3/16"3 1/4"1"194Black0.21"20000000000000
     
    back to top