McMaster-Carr logo
    Filter by
    End Type
    Spring Type
    System of Measurement
    Steel Grade
    Wire Diameter
    Attribute Image
    Length
    Attribute Image
    Extended Length @ Maximum Load
    Attribute Image
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Loop Type
    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)
    4 Products

    End Type

    Hook Type

    Hook Movement

    Extension Springs with Swivel-Hook Ends

    Image of Product. Front orientation. Extension Springs. Extension Springs with Swivel-Hook Ends.
    Put an end to downtime from broken hooks. The swivel-hook ends rotate freely from the spring body to handle stress and twisting without snapping.
    Hook End—Hook into closed holes, such as hanger bolt eyes. These springs work best when kept under tension, as they're more likely to slip off than loop-end springs when tension is released. Also known as machine hook ends.
    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.
    Hook End
     
    Spring Steel
    5 1/4"0.531"0.062"6.25"3.58.5511330K45000000
     

    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.
    Corrosion-Resistant 302 Stainless Steel—Won’t corrode from exposure to moisture and mild chemicals, including ammonia often found in cleaning solutions. These springs are easier to extend than steel, but can’t handle as high a load.
    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.
    Loop End
    Image of Product. Front orientation. Extension Springs. Loop End.
     
    Spring Steel
    5.25"0.625"0.08"8.888"6.0434.177.2769654K327000000
     
    Corrosion-Resistant 302 Stainless Steel
    5.25"0.85"0.075"6.75"1148.219065K69200000
     
    Elongated-Hook End
    Image of Product. Front orientation. Extension Springs. Elongated-Hook End.
     
    Spring Steel
    5 1/4"0.5"0.08"5.94"9.5127.7426.27396605K2700000
     
    back to top