Choker hitch capacity. This i cludes vertical, choke, and basket hitches.

Choker hitch capacity Wire Rope Sling CapacitiesWe Provide Wire Rope, Chain, Synthetic Slings, Cargo Control, Hardware, Fall Protection, and various other types of equipment for the utility, Marine, and construction industries. They are: Vertical Hitch, Basket Hitch, and Choker Hitch. ADJUSTING THE RATED CAPACITY OF A CHOKER HITCH Due to the body of the sling being used in the choke, there is a reduction in rated capacity. Buy Now! Sep 21, 2018 · Learn how to safely use a sling choker hitch, when to apply it, and what precautions to take to avoid capacity loss and rigging failure. The vertical hitch Work Load Limit is 50% of the basket hitch. For sling angles other than those shown, use the rated load for the next lower angle or a qualified person shall calculate the rated load. Double Wrap Choker Hitch The two-leg slings used in choker hitch, basket hitch, double wrap choker hitch and double wrap basket hitch should not be used for handling composite loads such as loose bundles or tubes, bars or wooden battens unless the friction grips between the parts is sufficient to prevent them slipping from sling. CHOKER hitches reduce lifting capability of a sling since this method of rigging affects ability of the wire rope components to adjust during the lift. Determine the angle of choke and multiply the choker hitch work load limit by the loss factor to get the reduced work load. Choker Hitch. In a basket hitch, the sling (which may consist of a chain sling made of Grade 80 or 100) is passed under the load and brought up on both sides to create a basket-like configuration. com Apr 7, 2025 · The Choker Single Leg Hitch is a commonly used method in lifting operations for handling pipes, beams, and scaffold jacks. Another reduction that must be considered is due to the “angle” of the choke (not the angle of the leg of the sling). When using a Choker hitch, 20 to 25 percent of single leg capacity is lost. ) Calculator Usage: This calculator is provided for general purpose use only. In some trades it became practice to use 2 slings in a choker configuration at less than 30 degrees with the choke points facing each other. Capacities for each method of rigging are typically included on the sling manufacturer’s charts, or on the tag attached to a sling. Double Choker Hitch The double choker hitch consists of two sling chokers attached to the load and spread to provide load stability. Click here to view our Metric Conversion for Standard Rope Diameters. If the load is hanging free, the normal choke angle is approximately 135 Learn how to use choker and basket hitches correctly. Unirope Slingmax offers a wide range of rigging products including sliding chokers, slings and more. com rigging Charts available for iphone cessary rigging capacity chart information. A choker hitch reduces the lift capacity to what percent of the sling's working load limit? Calculator Usage: This calculator is provided for general purpose use only. Diameter of curvature of load surface is at least double the diameter of the rope. Aug 28, 2025 · Use choker hitches at 75% or less of the rated sling capacity (sling capacity will depend on the choke angle). Always use a choker hitch when turning a load. The Basket Hitch has twice the capacity of a single leg if the legs are vertical. When a choker hitch is used at an angle of less than 120 degrees, you must reduce the hitch’s rated capacity as shown in the chart at right. Choker Hitch Capacity Calculator Results Reduction Factor Adjusted Rated Choker Capacity per Sling (lbs. May 26, 2023 · The basket hitch offers good control and balance, especially for loads that are not easily secured by other hitch types. Basket Hitch: Can increase capacity up to 200% of the SWL, depending on the angle and sling setup. A choke angle less than 120 degrees can result in a capacity as low as 40% of the single leg. Represents a load in choker hitch and illustrates the rotary force on the load and/or the slippage of the rope in contact with the load. To determine the actual capacity at a given angle of lift, multiply the original roundsling rating by the appropriate loss factor determined from the table below. A choker hitch has 80% of the capacity of a single leg sling only if the angle of choke is 120 degrees or greater. By considering the angle of choke and adhering to manufacturer recommendations, rigging professionals can ensure the proper utilization of the choker hitch and maintain a safe working environment. When turning a load: HITCHES- Basically three types of hitches are formed with synthetic slings. Vertical and basket hitches are commonly used for flat stock materials that can be stacked. This i cludes vertical, choke, and basket hitches. It provides a higher lifting capacity compared to the choker hitch, but it may have a slightly reduced capacity compared to the single vertical hitch due to the additional stress on the sling caused by the spread legs. Bridle Sling: Handles multi-point lifts, distributing weight evenly for stability. Rated Capacities based on design factor of 5. It is the responsibility of the user to assure that the data they enter is accurate and that the slings they use are appropriate for their application. This calculates the rated capacity for a sling used in a choker hitch. Use the outline to skip to specific sections: The Three Basic Hitches Vertical Hitches Choker Hitches Basket Hitches Calculating the Load on Each Leg of a Sling Bridle Angles Sling Eye Design Diameter Ratios Sling Usage Dictates Sling Body Construction Choker Hitch Rated Capacity Vertical - When a sling is used in a vertical hitch, the full lifting capacity of the sling material can be utilized. Plies are the number of layers of load-bearing webbing used in the sling assembly. The Vertical Hitch supports the entire load on a single leg. Choker hitches are used Choker hitches reduce lifting capacity of a sling, since this method of rigging affects the ability of the wire rope components to adjust during the lift, places angular loading on the body of the sling, and creates a small diameter bend in the sling at the choke point. Here is a brief overview of how the rigging method selected can impact the lifting capacity for three common sling hitches: vertical (straight), choker, and basket. The most basic hitch is the single leg or vertical hitch. A CHOKER HITCH HAS 80% OF THE CAPACITY OF A SINGLE LEG SLING ONLY IF THE ANGLE OF CHOKE IS 120 DEGREES OR GREATER. Use blocks to prevent angles less than 30°. For choker hitch, the angle of choke shall be 120 degrees or greater. 0 29 49 NOMINAL SLING STRENGTH is based upon the nominal **Percent of sling rated capacity in a choker hitch. (catalog) rope strength of the wire rope used in the sling CHOKER HITCH Aug 15, 2024 · As the angle decreases, so does its rated capacity to lift the load. Inc. Refer to the handout accompanying this toolbox talk for general examples (not to be used in Choker Hitch Rated Capacity Adjustment For wire rope slings in choker hitch when angle of choke is less than 120° Dec 16, 2024 · Choker Hitch: Reduces capacity to approximately 75-80% of the SWL. For example: The BASKET and CHOKER hitch capacities listed (in all Standards and Regulations) for 6-strand ropes are based on a minimum D/d ratio of 25:1. See full list on mazzellacompanies. The single choker hitch can be doubled up to provide twice the capacity or to turn a load as shown below (Doubling a single choker hitch is not the same as using a double choker hitch. TABLE 1 CHOKER HITCH RATED CAPACITY ADJUSTMENT ANGLE OF CHOKE IN DEGREES RATED CAPACITY IWRC AND FC ROPE PERCENT** OVER 120 100 90-120 87 60- 89 74 30- 59 62 0- 29 49 **Percent of sling rated capacity in a choker hitch Figure 1 Figure 2 Figure 3 Choker hitch rated capacity adjustment. NO LOSS IN CAPACITY RESULTS IF A CRADLE GRAB HOOK IS USED WHEN ANGLE OF CHOKE IS 120 DEGREES OR GREATER A choker hitch has 80% of the capacity of a single leg sling only if the angle of choke is 120 degrees or greater. To view full access to our Technical Reference documents, please follow the links below. A CHAIN CHOKER HITCH HAS 80% OF THE CAPACITY OF A SINGLE LEG SLING ONLY IF THE ANGLE OF CHOKE IS 120 DEGREES OR GREATER. May 28, 2023 · In conclusion, understanding the relationship between the choke angle and the capacity of the choker hitch is essential for safe and effective lifting operations. *Percent of sling’s rated capacity in a choker hitch. This shows the metric size equivalent to imperial rope diameters. When two or more slings are attached to the same lifting hook, the total hitch becomes, in effect, a lifting bridle, and the load is distributed equally among the individual slings. unirope. It involves looping the sling around the load and back through one of its ends or a choker hook. Use choker hitches at 75% or less of the rated sling capacity (sling capacity will depend on the choke angle). You always must adjust the rated capacity of the wire rope sling whenever you use a choker hitch to shift, turn or control a load, or when the pull is against the choke in a multi-leg lift. In addition, we offer inspection and proof testing services. Click here to view our Block Stability Calculator. Also included in the charts are screw pin shackles Department of Energy Mar 3, 2025 · Choker Hitch: Securely grips items like pipes or logs but loses capacity as angles decrease. The sling is wrapped around the load and then threaded through its eye, forming a choke around it. ** Working Load Limit, based on standard carbon fittings unless noted otherwise. Use slings that are long enough so that the choker hitch is effective and the "grip" is on the webbing. Do not use it on loose bundles or long loads. Although it makes a nice “tight” choke around pipes and bundles of steel, remember that this practice reduces your sling capacity by more than 50%! Reduction of CHOKER Sling Capacity (WLL) Basket hitch capacity based on minimum D/d ratio of 25/1. Nov 4, 2023 · Choker Hitch In a choker hitch, the capacity of the web sling is reduced because the load is at an angle. RATED LOADS FOR ANGLES OF CHOKE LESS THAN 120 DEGREES SHALL BE DETERMINED BY THE SLING MFG OR A QUALIFIED PERSON. . Lift-It Mfg. Horizontal sling angles of less than 30 degrees are not recommended. Selvage Edge is the woven, or knitted, edge of a webbing formed to prevent raveling. *** See Choker Hitch Rated Capacity Adjustment on page 7. In controlled tests, where the angle was less then 120 degrees, the sling body should always fail at the point of choke when pulled to destruction. ,909-469-2251,manufacturer and safety training provider to the industrial lifting sling and rigging industries for over 30 years. Click here to view our Choker Rated Capacity Calculator. EFFECTS OF SLING ANGLES SLING LIFTING CAPACITIES ARE AFFECTED BY ANGLE OF LIFT (ROUND SLING TO LOAD ANGLE) MEASURED FROM THE HORIZONTAL, WHEN USED WITH MULTI-LEGGED ROUND SLINGS OR CHOKER/BASKET HITCHES. Most slings can be used in all three sling hitches, but some slings are designed for use in only one hitch. The degree of the angle will determine how much the capacity will be reduced. However Choker Hitch Angles When a choke hitch is used, and the angle of choke is less than 120 degrees, the sling choker hitch capacity decreases. Vertical Hitch. Choker Hitch Capacity Sling Calculator Wire Rope Slings For Inspection, Re-Certification, www. Basket hitch: A basket hitch is described by federal OSHA as a sling configuration whereby the sling is passed under the load and has both end atachments, eyes or handles placed on the lifting hook or a single master link. Rated Capacity (or Working Load Limit) is the maximum allowable working load for each sling for the type of hitch used. ). com Product Information, and Technical Services go to Ensure that, in a basket hitch, the load is balanced to prevent slippage, When using a basket hitch, ensure that the legs of the sling contain or support the load from the sides, above the center of gravity, so that the load remains under control, Ensure that, in a choker hitch, the choke point is only on the sling body, never on a splice or Nov 24, 2023 · Basket Hitch. Choker Hitch Capacities When the 120o, pull on a choker hitch results in an angle of less than the work load limit must be adjusted. A CHOKE ANGLE LESS THAN 120 DEGREES WILL RESULT IN A CAPACITY AS LOW AS 40% OF THE SINGLE LEG. It’s essential to consider the angle and calculate the capacity accordingly. Rated capacities are affected by angle of lift (roundsling to load angle) measured from the horizontal when used with multi-legged roundslings or choker/basket hitches. The synthetic choker hitch Work Load Limit is a maximum of 80% of the vertical hitch Work Jul 26, 2023 · In this article, we outline important information related to wire rope design, hitches, load weight, and more. ARC is a factory authorized repair center for IKAR/Ultra Safe retractable lifelines and renfroe clamps. For wire rope slings in choker hitch when angle is less than REDUCTION IN CAPACITY - BASKET HITCH REDUCTION from the horizontal. The rated capacity must also be adjusted when, in a multi-leg lift, the pull is against the choke. Once the angle is determined, (using the 90° basket hitch capacity), multiply the sling capacity by the appropriate loss As is evident from a wire rope sling capacity chart, the rated capacity of a wire rope sling must be adjusted when using a choker hitch to turn, shifts, or control the load. When a choker hitch is drawn tight at an angle of less than 120 degrees, the Choker Hitch Rated Capacity shown in the sling Rated Capacity Tables must be reduced to allow for loss of Rated Capacity. While effective, this method reduces the safe lifting capacity due to added tension and pressure on the sling. PSS Industrial Group makes no guarantees that the information provided in this calculator is correct. Basket Hitch The basket hitch is another common configuration where the capacity is higher than in a choker hitch but less than in a straight vertical lift. Whether it's the straightforward vertical sling hitch, the high-capacity basket sling hitch, or the secure choker sling hitch, understanding the pros, cons, and ideal use-cases for each can guide you in making an informed choice. When a sling is used in a BASKET- or CHOKER HITCH with D/d ratios smaller than listed in the capacity tables, the rated capacities (or WLLs) must be decreased. Slings have the largest Work Load Limit when used in a basket hitch. TO DETERMINE THE ACTUAL CAPACITY AT A GIVEN ANGLE OF LIFT, MULTIPLY THE ORIGINAL SLING RATING BY THE APPROPRIATE ANGLE FACTOR SHOWN. If the sling is not rigged properly, the turning action will loosen the hitch resulting in a load slippage. SLINGS WIRE ROPE GENERAL INFORMATION TABLE 1 CHOKER HITCH RATED CAPACITY ADJUSTMENT ANGLE OF CHOKER IN RATED CAPACITY IWRC DEGREES** AND FC ROPE PERCENT OVER 120 100 90 120 87 60 89 74 30 59 62 Figure 1. A choke angle less than 120 degrees will result in a capacity as low as 40% of the single leg. This method provides the greatest lifting capacity; double that of a vertical (straight) sling hitch, and about two and a half times that of a choker configuration. Choker Hitch: ing around the load. Slings carry their loads in one of three primary sling hitches. When a chok-er hitch is used at an angle of less than 120 degrees, you must reduce the hitch’s rated capacity as shown in the chart at right. It’s important to note that a sling used in a choker hitch has a reduced capacity, as show Angle of Choke % of Choker Capacity Choker Hitch Rated Capacity - A choker hitch will have 75% of the capacity of a single leg vertical hitch only if the corners are softened and the horizontal angle is greater than 30°. A choker hitch has 75% of the capacity of a single leg sling only if the angle of choke is 120 degrees or greater. Lifting and Rigging Supplies | Wire Rope Supplier | Kennedy As an example, one sling in a basket hitch or two slings attached to one crane hook are different applications involving different sling angles. Horizontal sling angles less than 30° shall not be used. Choker Rated Capacity Calculator This calculates the rated capacity for a sling used in a choker hitch. Double polyester tubing for better abrasion resistance, and easier inspection You do not have to consider choker hitch reduction factors unless the load gets wider. Choker - Due to the stress created at the choke point, slings rigged with this hitch achieve only about 75% of their potential capacity. Every chart in the app includes the th ee basic hitches and their load capacities. 2. Vertical - When a sling is used in a vertical hitch, the full lifting capacity of the sling material can be utilized. To determine the minimum rated capacity for your choker hitch, the American Society of Mechanical Engineers (ASME) and the Web Sling & Tie Down Association (WSTDA) put together charts where a specific range of sling angles corresponds to the appropriate reduction factor. You will then be asked to login or register a new account. What percentage of capacity is lost when using a choke hitch compared to a vertical? 1. Choke angles less than 120 degrees will result in a significantly reduced capacity. To determine the actual sling capacity at a given angle of choke, multiply the sling capacity rating (for a choker hitch) by the appropriate reduction factor determined from the tables below. lifting. This is reflected in the choker rated capacity tables. Then consider reducing the sling capacity due the to the angularity factor.