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Stren-Flex Lifting Slings, Strength and Flexibility In Lifting

Stren-Flex® Synthetic Round Slings, Synthetic Web Slings, Cargo Strap Tiedowns,Chain Slings, and Lifting Slings
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Member - Material Handling Industry of America
Member - Associated Wire Rope Fabricators Member - Web Sling & Tie Down Association

Chain Sling Selection Tips

Chain slings boast the best resistance to abrasion, cuts, and heat in comparison to all other types of slings.  Chain slings also feature high flexibility in combination with average elongation (up to 20% prior to failure) and shock resistance characteristics.  Perhaps the most advantageous feature of a chain sling is its ability to be repaired.  Nearly all damaged components discovered during an inspection can be repaired and restored to useful conditions  Chain slings do however have the poorest strength to weight ratio in comparison to all other sling materials.

  1. Tips on sling types

    Different "Types" of chain slings can be assembled in order to accommodate individual, specific needs. Chain slings are typically designated by a three character symbol based upon the number of legs and types of components used in the assembly

    First Character (Basic Type of Construction)

    S = Single leg sling SB = Single basket
    D = Double leg sling DB = Double basket
    T = Triple leg sling SE = Single endless basket
    Q = Quadruple leg sling DE = Double endless basket
    C = Single leg sling with master link at each end

    Second Character (Type of Master Link or End Link)

    O = Oblong master link (recommended for all assemblies
    P = Pear shaped master link (upon request only)

    Third Character (Type of Hook)

    S = Sling hook
    G = Grab hook
    F = Foundry hook

  2. Tips on Working Load Limits

    Sling angles have a direct and oftentimes dramatic affect on the working load limit of a sling. This angle, which is measured between a horizontal line and the sling leg or body, may apply to a single leg sling in an angled vertical or basket hitch, or a multi-legged bridle sling. Anytime pull is exerted at an angle on a leg, the tension, or stress, on each leg is increased.

    It is critical that working load limits be reduced in order to account for sling angles. Angles less than 45° are not recommended and those below 30° should be avoided whenever possible. Use our load calculator or the formula and chart shown below to calculate the reduction in working load limits caused by various sling angles.

    Actual sling working load limit = (Factor) x (Working load limit)

    Sling Angles in Degrees Factor Sling Angles in Degrees Factor
    15 0.2590 55 0.8190
    20 0.3420 60 0.8660
    25 0.4320 65 0.9060
    30 0.5000 70 0.9400
    35 0.5740 75 0.9660
    40 0.6430 80 0.9850
    45 0.7070 85 0.9960
    50 0.7660 90 1.0000
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