What Are the Different Types of Lifting Hooks and Sling Hooks?

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  • What Are the Different Types of Lifting Hooks and Sling Hooks?

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    Publicado en : 28-10-21

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    What Are the Different Types of Lifting Hooks and Sling Hooks?

    What Are the Different Types of Lifting Hooks and Sling Hooks?
        Are you planning your next overhead lifting project and need to specify the type of

    sling and rigging equipment you’ll be using? While it’s important to understand the best

    type of sling to use, it’s just as important to select the right type rigging hardware

    that will be connected to that sling. Choosing the right type of lifting hook that can be

    used will be determined by a number of different factors.
        In this article, we’ll discuss the different type of

     G100 sling

    hooks
    that exist, including: eye hooks, clevis hooks, swivel hooks, hooks with

    latches, sorting hooks, foundry hooks, j-hooks, grab hooks, and barrel hooks.
        At Mazzella, we offer all styles of lifting slings, rigging hardware, wire rope,

    overhead cranes and hoists, hoist parts, and engineered below-the-hook lifting devices. Our

    goal for this article is to help you select the right type of sling assembly for your

    future lifting and rigging needs.
        If you’re looking for more information on the advantages/disadvantages between wire

    rope, chain, and synthetic slings, we also have an article on how to choose the best

    lifting sling for your application.
        There are two main ways a lifting hook or G100 self-locking hooks can be attached to the

    sling—you can either use a hook with an eye at the top, or with a clevis at the top to

    make your connection to the sling. There are also hooks that have a bearing or bushing at

    the top that swivels. We’ll dive a little deeper into all three of these styles below:
        Eye Hooks
        On an eye hook, a chain or fittings are welded for a permanent connection to the sling.

    With an eye hook, you get far more flexibility in terms of movement and ergonomics to

    position the hook and attach it to the load. However, an eye hook is a permanent solution—

    if the throat of the hook becomes stretched, cracked, or bent during use, the whole sling

    would have to be failed out upon inspection and removed from service.
        Clevis Hooks
        A clevis fastener is a fastener system consisting of a clevis and clevis pin. The

    clevis is a U-shaped piece that has holes at the end of prongs to accept the clevis pin.

    The clevis pin is similar to a bolt, but is only partially threaded or unthreaded with a

    cross-hole for a split pin. A clevis hook is a hook, with or without a snap lock, with a

    clevis and bolt or pin at the base. The clevis is used to fasten the hook to a bracket or

    chain.
        Some rigging shops and end users who are not certified to weld alloy chain slings,

    utilize clevis hooks to make a mechanical connection to a chain sling. The advantage of a

    mechanical connection is that if a clevis hook becomes damaged due to stretch, bending, or

    cracking, it can easily be removed and replaced without scrapping the entire chain sling.

    If this occurs on a chain sling, this is considered a repair to the sling and must be

    proof-tested prior to the sling being put back into service.
        Also, a clevis hook can pivot side to side for positioning when connecting to a load,

    but doesn’t have the same flexibility or freedom of movement that an eye hook does.
        Swivel Hooks
        There are two types of swivel hooks and the user should be aware of the type of swivel

    hook that they’re using prior to lifting a load into the air:
        Positioning Swivel Hook – This type of hook swivels to allow the rigger to properly

    align the hook during connection to the load. This type of hook is NOT designed to rotate

    while under load and is only to be used when you need to position the hook onto the pick

    point.
        True Swivel Hook with Bearing – This type of swivel hook has a bearing inside that

    allows the hook to rotate freely under load. The top fitting swivels and pivots to allow

    the load to rotate to prevent twisting of the rigging.
        When deciding on whether to use a hook latch or not, careful consideration must be

    given to the specific lifting application. The use of latches on hooks is a topic that is

    constantly up for debate in the lifting and rigging industries. While some people argue

    that hook latches are always required and should always be utilized, others argue that

    latches are not required.
        Unfortunately, there are limited explanations or interpretations of when a latch on a

    hook must be utilized. With no clear industry-wide rules on whether a hook latch is

    required on a crane hook or a G100 grab hook, the decision is ultimately left up to the owner or end-

    user. 
        As an organization, Mazzella recommends that hook latches should be used. When we train

    our employees and inspectors on the use of hook latches, we take all of the following into

    consideration:
        Any hook that is designed to have a latch, should have the latch installed
        New slings are sold with the latch installed unless the customer requests no latch
        If customers make an inquiry about the use of a latch on a hook, we may recommend for

    them to consider several OSHA standard interpretations, among them the following:
        The Occupational Safety and Health Act of 1970 also contemplates that, in the absence

    of a specific OSHA standard addressing a hazard, employers are required, by the statute’s

    “General Duty Clause” (Section 5(a)(1)), to protect employees from serious recognized

    hazards. OSHA often considers the provisions of industry consensus standards, such as those

    published by the American National Standards Institute (ANSI) or the American Society of

    Mechanical Engineers (ASME), when evaluating whether a hazard is “recognized” and whether

    there is a feasible means of abating that hazard.
      One such provision that OSHA would consider is Section 2-1.14.5, Hooks, of ASME B30.2-

    2001, Overhead and Gantry Cranes: “Latch-equipped hooks shall be used unless the

    application makes the use of the latch impractical or unnecessary.”
        Or the following OSHA standard interpretation may be referenced: The requirement for

    safety latches (AKA throat latches) is only specified in OSHA 1910.181(j)(2)(ii), which

    states that “Safety latch type hooks shall be used wherever possible.”
        Or the following OSHA standard interpretation may be referenced: Whether OSHA requires

    a safety latch on a G80 self-locking hooks depends on the activity for which the sling is being

    used.
        We advise that the end user must evaluate the work activity with regards to the safety

    of their employees. If the activity makes the use of the latch impractical, unnecessary, or

    more dangerous, then the end user may choose to eliminate the latch. It is also recommended

    that each lifting activity is considered independently as far as the use of a hook latch is

    concerned.
        All hook manufacturers make products with or without latches. Some hooks are compatible

    with self-closing latch kits so that a latch can be added at the time of the sale or post-

    sale.
        There are two types of hooks that rarely utilize a latch assembly due to the nature of

    the lift or the environment where the lift is being performed:
        A sorting hook will never utilize a latch kit. They’re typically being utilized for

    lifts with tip loading or where a latch would limit the practical use when lifting plates

    and cylindrical loads (such as pipe) where full throat engagement is required.
        A foundry hook rarely utilizes a latch kit because they’re often used in environments

    or applications where there is a clear danger for a worker to reach up to connect the load

    or remove the load from the hook.
        The one disadvantage of a hook with a self-closing latch is that they have a much

    shorter life span than a positive latching hook. One thing to consider when buying a hook

    with a latch kit is to understand if it’s an imported or domestically-made product.
        Imported rigging products are attractive because they’re often less expensive than a

    domestically-made product. However, if the latch breaks on an imported hook, it can be very

    difficult, or expensive, to find a replacement latch kit. You may even wipe out the initial

    cost-savings by having to buy a completely new hook because you can’t source the

    replacement latch kit.
        For domestically-made hooks, you can contact the manufacturer or distributor directly

    and they can provide you with the exact replacement latch kit part # and get you a

    replacement kit at a fraction of the cost of a new hook.
        A positive latching hook is a hook with a latch that is a more robust and engineered

    component of the hook. The advantage of a positive latching hook is that it’s nearly

    impossible to break the latch on these hooks and once it closes, it can’t open again until

    the load is released from the hook.
        These types of hooks are close to standard on chain slings because they’re more robust

    and can handle heavier-duty environments and lifts where chain is the preferred sling

    medium.
        Sorting hooks, also known as “lay out hooks” or “shake out hooks,” are used to sort

    or lay out products like flat plate, pipes, or other tube-shaped objects. They’re used in

    multi-leg sling assemblies for applications where the object or item will engage to the

    full depth of the throat of the hook.
        Sorting hooks must be used at a 30° to 45° angle to get full engagement—if the load

    is not fully engaged with the throat opening, significant reduction to the Working Load

    Limit of the hook can occur.
        Sorting hooks are one of the few types of hooks designed not to use a latch. The use of

    a latch would limit the practical use of the hook when lifting plates and cylindrical loads

    where full throat engagement of the hook is required.
        A sorting hook is NOT the same as a pelican hook. Many customers mistakenly refer to a

    sorting hook as a “pelican hook.” However, pelican hooks are used in nautical and marine

    applications and are not rated to perform overhead lifts.
        Foundry hooks are typically used on chain slings and are designed with a wide deep

    throat to fit trunnions and handles on molds or castings for foundry work.
        Foundry hooks are most commonly designed to be used without a latch, because they’re

    often used in high-heat applications where there is a clear danger for a human to reach up

    to connect or remove the load from the hook.
        Due to the environments they’re used in, foundry hooks are often used in applications

    where tip loading is necessary.
        J-Hooks are most often used in industrial and manufacturing applications. They have a

    low-profile and slimmer design than traditional sling hooks, which allows them to be used

    with chains, hoists, and slings to efficiently move materials in applications where a sling

    hook, grab hook, or foundry hook would not be suitable.
      J-Hooks are often used with eye bolts or an engineered lifting point on a load. A low-

    profile tip and throat can fit in much easier than a larger sling hook or foundry hook for

    a positive connection to the load.
        J-Hooks are often custom-engineered for the specific application and are most commonly

    used without latches, but latch kits are available. The eye at the top of the hook can be

    configured in a variety of orientations depending on the application. “Style A” and

    “Style B” J-Hooks have an eye that’s parallel with the rest of the hook, while “Style C

    ” J-Hooks have an eyelet that is perpendicular to the hook body.
      Because J-Hooks have less material than standard G80 grab hooks, they have a lower Working Load

    Limit than most other types of hooks.
      Grab hooks are designed with a special narrow throat used to “grab” and shorten or

    hold a length of chain used in tie-down applications and in load-rated lifting slings. The

    throat engages the chain between the links for quick non-slip handling. Grab hooks are

    manufactured to be used with a specific size and grade of chain. There are two types of

    grab hooks, so the end-user should understand what type of grab hook they’re using prior

    to lifting a load into the air:
        Standard grab hook – Becoming less common, the “non-cradle” grab hook is most often

    seen in tie-down applications. When using a standard style grab hook, it is important to be

    aware of any reductions in working load limit (WLL) that the hook manufacturer may require

    based on usage configuration. When using a “standard” grab hook, most manufacturers

    require a reduction of 20% of the WLL.
        Cradle grab hook – The “cradle style” is replacing the “non-cradle” or “standard

    ” grab hook for most applications due to its improved support of the engaged chain link.

    This additional support of the engaged link often means there is no reduction of working

    load limit (WLL) when used as designed. Always follow manufacturer recommendations for all

    lifting products.
        Barrel Hooks are used for lifting barrels or drums. They have a wide end point that

    goes under the lip of a barrel or drum and are used in conjunction with a multi-leg sling

    assembly. Typically used in conjunction with a pair of slings and are designed to be

    utilized at 30-45° angles.
      When it comes down to it, the most important part of determining what type of hook to

    use for an overhead lift is to ask yourself, “how am I connecting to the load?” Will the

    load have eye bolts, swivel hoist rings, engineered lifting points, or will you be using

    shackles to connect the hook to?

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