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    20 Products

    Extension Springs

    The farther you stretch these springs, the harder they pull to bring the two ends back together. They're commonly used to tension cable, return an air cylinder to its starting point, or hold a door closed.
    Loop End—The most secure attachment method. With fully closed loops, there's no risk of slipping off.
    Elongated-Hook End—With deeper hooks than standard hook end springs, these are less likely to slip off. However, they’re more prone to breaking if overstretched.
    Spring Steel—Strong and resilient, but best suited for dry environments since moisture will cause these springs to rust.
    Minimum Load—The amount of force required to start extending the spring.
    Maximum Load—The amount of force required to fully extend the spring.
    Load,
    lb.
    Lg.
    OD
    Wire
    Dia.
    Extended Lg.
    @ Max. Load
    Min.
    Max.
    Spring Rate,
    lbf/in
    Pkg.
    Qty.
    Pkg.
    Elongated-Hook End
    Image of Product. Side1 orientation. Extension Springs. Elongated-Hook End.
     
    Spring Steel
    1 3/4"0.25"0.047"1.99"4.118.359.961330K29000000
    2 3/8"0.281"0.047"2.765"3.4411.7521.32696605K2300000
    2 1/2"0.313"0.023"5.52"0.151.20.34696605K4400000
    3 1/2"0.25"0.041"4.04"2.618.3510.67696605K2100000
    3 3/4"0.563"0.072"4.21"4.1317.629.44396605K2600000
    4"0.25"0.035"4.49"1.425.267.87696605K2200000
    5 1/4"0.5"0.08"5.94"9.5127.7426.27396605K2700000
    5.531"0.719"0.047"14.625"0.484.590.46109290K4500000
    5 3/4"0.375"0.054"7.932"3.513.444.69196605K540000
    5 3/4"0.437"0.054"9.022"2.6411.362.72196605K530000
    5 3/4"0.5"0.062"8.442"3.5214.684.25196605K510000
    6"0.25"0.041"7.802"2.549.363.93196605K550000
    8.124"0.438"0.063"10.25"2.5712.086.04109290K2100000
    8 1/2"0.468"0.054"10.08"2.3110.365.22196605K570000
    10 1/4"0.75"0.091"12.24"7.3125.649.19396605K100000
     
    Elongated-Hook End × Loop End
    Image of Product. Front orientation. Extension Springs. Elongated-Hook End × Loop End.
     
    Spring Steel
    1 5/8"0.25"0.039"1.895"1.957.2919.42696605K3100000
    2"0.313"0.041"2.54"1.736.438.7696605K3200000
    5"0.563"0.072"6.29"5.0817.69.73396605K3400000
    5 1/2"0.375"0.062"6.31"6.0617.9414.62396605K3500000
     

    Extension Spring Assortments

    Image of Product. Front orientation. Extension Springs. Extension Spring Assortments.
    Keep a variety of springs in different lengths, ODs, and wire diameters on hand for the perfect fit.
    Elongated-Hook End—With deeper hooks than standard hook end springs, these are less likely to slip off. However, they’re more prone to breaking if overstretched.
    Spring Steel—Strong and resilient, but best suited for dry environments since moisture will cause these springs to rust.
    No. of
    Pieces
    No. of
    Sizes
    Includes
    Container
    Type
    Each
    Elongated-Hook End
     
    Spring Steel
    721272 extension springs in sizes ranging from 1.625"-10.25" lg., 0.25"-0.75" OD, and 0.023"-0.091" wire dia.Plastic Box96605K720000000
     
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