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

    Heat-Shrink Reducing Crimp-On Butt Splices

    Image of Product. Front orientation. Wire Splices, Connectors, and Taps. Heat-Shrink Reducing Crimp-On Butt Splices, Fully Insulated.

    Fully Insulated

    Image of Product. Fully Insulated with Window. Front orientation. Wire Splices, Connectors, and Taps. Heat-Shrink Reducing Crimp-On Butt Splices, With Window, Fully Insulated.

    Fully Insulated

    with Window

    An upgrade in strength and strain relief over standard reducing splices. After crimping your splice, apply a heat gun or butane torch to shrink the plastic and grip wire securely under tension and vibration. The heat shrink also protects wire from the drips, dirt, and scuffs that lead to fraying, poor conductivity, and short circuits. Also known as step-down splices, reducing splices join a larger wire and a smaller wire end to end. Colored stripes differentiate the larger and smaller openings so you don't have to measure and mark them yourself.
    Nylon Insulation—In addition to preventing short circuits, this wear-resistant insulation protects wire from vibration and rubbing against nearby edges.
    Polyolefin Insulation—A durable, economical choice when you don't need the extra wear resistance of nylon.
    With Window—Troubleshoot bad connections without removing your splice. The splice has a cutout where the wires meet, so you can confirm at a glance that they're crimped evenly and haven't loosened.
    For Wire
    Ga.
    Construction
    Lg.
    Insulation
    Color
    Stripe Color
    Terminal
    Material
    Max. Temp.,
    ° F
    Max. Voltage
    Shrink
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Nylon Insulation
     
    Single Crimp
    16 to 14 × 22 to 18Stranded
    1.6"BlueRedTin-Plated Copper220600V AC
    600V DC
    195100000000000000
    12 to 10 × 16 to 14Stranded
    1.8"YellowBlueTin-Plated Copper220600V AC
    600V DC
    1955000000000000
     
    Plastic Insulation with Window
     
    Single Crimp
    22 to 18 × 24 to 22Solid, Stranded
    1.47"ClearRed × WhiteTin-Plated Copper255600V AC
    600V DC
    19010000000000000
    16 to 14 × 22 to 18Solid, Stranded
    1.47"ClearBlue × RedTin-Plated Copper255600V AC
    600V DC
    19010000000000000
    12 to 10 × 16 to 14Solid, Stranded
    1.59"ClearYellow × BlueTin-Plated Copper255600V AC
    600V DC
    19010000000000000
    8 × 12 to 10Solid, Stranded
    1.59"ClearRed × YellowTin-Plated Copper255600V AC
    600V DC
    19010000000000000
     
    Polyolefin Insulation
     
    Single Crimp
    8 × 12 to 10Solid, Stranded
    1.8"RedRed × YellowTin-Plated Copper220600V AC27510000000000000
     
    Polyolefin Insulation with Window
     
    Single Crimp
    22 to 18 × 24 to 22Solid, Stranded
    1.6"RedRedTin-Plated Copper220600V AC
    600V DC
    27510000000000000
     

    Reducing Crimp-On Butt Splices

    Connect two components with different wire sizes, such as a large air compressor and its control panel. Also known as step-down splices, these splices join a larger wire and a smaller wire end to end. Colored stripes differentiate the larger and smaller openings so you don't have to measure and mark them yourself. Attach your wire with a crimping tool to avoid a damaged splice and loose connection.
    Vinyl Plastic Insulation—Our basic insulation covers the wire to prevent short circuits. It won’t break down from dirt, grime, and occasional twists and tugs.
    For Wire
    Ga.
    Construction
    Lg.
    Insulation
    Color
    Stripe Color
    Terminal
    Material
    Max. Temp.,
    ° F
    Max. Voltage
    Certification
    Pkg.
    Qty.
    Pkg.
    Vinyl Plastic Insulation
    Image of Product. Front orientation. Wire Splices, Connectors, and Taps. Reducing Crimp-On Butt Splices, Fully Insulated.
     
    Single Crimp
    16 to 14 × 22 to 18Solid
    1.1"BlueBlue × RedTin-Plated Copper220600V DC100000000000000
    12 to 10 × 16 to 14Solid
    1.3"YellowYellow × BlueTin-Plated Copper220600V DC10000000000000
    8 × 12 to 10Solid
    1.5"RedRed × YellowTin-Plated Copper220600V DC10000000000000
    6 × 8Solid
    1.8"BlueBlue × RedTin-Plated Copper220600V DC5000000000000
     
    Noninsulated
    Image of Product. Front orientation. Wire Splices, Connectors, and Taps. Reducing Crimp-On Butt Splices, Noninsulated.
     
    Single Crimp
    22 to 18 × 26 to 24Solid, Stranded
    0.7"Red × WhiteTin-Plated Copper345600V AC
    600V DC
    2500000000000
    16 to 14 × 22 to 18Stranded
    0.7"RedTin-Plated Copper300Not RatedCSA Certified, UL Listed
    100000000000
    12 to 10 × 22 to 18Solid, Stranded
    0.8"Red × YellowTin-Plated Copper345600V AC
    600V DC
    C-UL Listed, UL Listed
    1000000000000
    12 to 10 × 16 to 14Stranded
    0.8"BlueTin-Plated Copper300Not RatedCSA Certified, UL Listed
    100000000000
    8 × 16 to 14Solid, Stranded
    0.8"Red × BlueTin-Plated Copper345600V AC
    600V DC
    C-UL Listed, UL Listed
    10000000000000
    8 × 12 to 10Stranded
    0.9"YellowTin-Plated Copper300Not RatedCSA Certified, UL Listed
    1000000000000
    6 × 8Stranded
    1.1"RedTin-Plated Copper300Not RatedCSA Certified, UL Listed
    1000000000000
     

    Reducing Compression Butt Splices

    Image of Product. Front orientation. Wire Splices, Connectors, and Taps. Reducing Compression Butt Splices.
    Connect large wires of different sizes, as thick as 4/0 AWG. Colored stripes differentiate the larger and smaller openings so you don't have to measure and mark them yourself. Check the color coding, wire gauge, and compression die reference number on the splice to match it with the right compression tool.
    With Window—Troubleshoot bad connections without removing your splice. The splice has a cutout where the wires meet, so you can confirm at a glance that they're crimped evenly and haven't loosened.
    For Wire
    Ga.
    Construction
    Lg.
    Stripe Color
    Terminal
    Material
    Max. Temp.,
    ° F
    Max. Voltage,
    V AC
    Certification
    Each
    Noninsulated with Window
     
    Single Crimp
    6 × 4Stranded
    1.95"Blue × GrayTin-Plated Copper190600C-UL Listed, UL Listed
    000000000000
    6 × 2Stranded
    2.11"Blue × BrownTin-Plated Copper190600C-UL Listed, UL Listed
    00000000000
    6 × 1/0Stranded
    2.26"Blue × PinkTin-Plated Copper190600C-UL Listed, UL Listed
    000000000000
    6 × 2/0Stranded
    2.42"Blue × BlackTin-Plated Copper190600C-UL Listed, UL Listed
    000000000000
    6 × 4/0Stranded
    2.69"Blue × PurpleTin-Plated Copper190600C-UL Listed, UL Listed
    000000000000
    4 × 2Stranded
    2.06"Gray × BrownTin-Plated Copper190600C-UL Listed, UL Listed
    00000000000
    4 × 1/0Stranded
    2.21"Gray × PinkTin-Plated Copper190600C-UL Listed, UL Listed
    000000000000
    4 × 2/0Stranded
    2.36"Gray × BlackTin-Plated Copper190600C-UL Listed, UL Listed
    000000000000
    1/0 × 4/0Stranded
    2.4"Pink × PurpleTin-Plated Copper190600C-UL Listed, UL Listed
    000000000000
    2/0 × 4/0Stranded
    2.35"Black × PurpleTin-Plated Copper190600C-UL Listed, UL Listed
    000000000000
     

    Tight-Hold Heat-Shrink Reducing Butt Splices

    Image of Product. Front orientation. Wire Splices, Connectors, and Taps. Tight-Hold Heat-Shrink Reducing Butt Splices.
    Our strongest-gripping reducing butt splices hold wire securely through heavy vibration and sharp tugs. Also known as step-down splices, reducing splices join a larger wire and a smaller wire end to end. Colored stripes differentiate the larger and smaller openings so you don't have to measure and mark them yourself.
    Solder and Crimp-On Connection—The tightest hold you can get. First, squeeze the splice firmly and evenly onto the wire with a crimping tool. Next, melt the heat-shrink insulation and enclosed solder to add even more stiffness and strength.
    Polyolefin Insulation—The durable plastic maintains a tight grip on the wire so it stays put when pulled or vibrated.
    For Wire
    Ga.
    Construction
    Lg.
    Insulation
    Color
    Stripe Color
    Terminal
    Material
    Max. Temp.,
    ° F
    Max. Voltage
    Shrink
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Polyolefin Insulation
     
    Solder and Crimp-On Connection
    22 to 18 × 24 to 22Solid, Stranded
    1.5"RedRed × WhiteTin-Plated Copper230600V AC
    600V DC
    275100000000000000
    16 to 14 × 22 to 18Solid, Stranded
    1.5"BlueBlue × RedTin-Plated Copper230600V AC
    600V DC
    27510000000000000
    12 to 10 × 16 to 14Solid, Stranded
    1.5"YellowYellow × BlueTin-Plated Copper230600V AC
    600V DC
    27510000000000000
    8 × 12 to 10Solid, Stranded
    1.75"PinkPink × YellowTin-Plated Copper230600V AC
    600V DC
    27510000000000000
     

    Tight-Hold Heat-Shrink Wire Connectors

    Image of Product. Front orientation. Wire Splices, Connectors, and Taps. Tight-Hold Heat-Shrink Wire Connectors.
    Our tightest-holding connectors secure wire through heavy vibration and sharp tugs. Apply a heat gun or butane torch to shrink the insulation and firmly grip the wire. As the connector heats up, the enclosed solder melts around the wire for a stronger, more rigid connection than unsoldered wire.
    For Wire
    Ga.
    Construction
    For Max.
    Bundle Dia.
    Insulation
    Color
    Terminal
    Material
    Max. Temp.,
    ° F
    Max. Voltage
    Shrink
    Temp., ° F
    Certification
    Pkg.
    Qty.
    Pkg.
    PVDF Insulation
     
    Solder Connection
    18 to 14Stranded
    0.130"BlueCopper257600V AC
    600V DC
    824C-UL Listed, UL Listed
    50000000000000
    14 to 12Stranded
    0.175"BlueCopper257600V AC
    600V DC
    824C-UL Listed, UL Listed
    5000000000000
    12 to 8Stranded
    0.275"BlueCopper257600V AC
    600V DC
    824C-UL Listed, UL Listed
    5000000000000
     
    back to top