Either method has the same rated capacity, size for size. For a 26mm wire rope to escape bend fatigue the winch drum or block sheaves over which it runs would need a. The rated capacity of a wire rope sling is based upon the minimum breaking force mbf of the wire rope used in the sling and other 2 union a wireco worldgroup brand. Quad leg wire rope slings are comprised of four lengths of wire rope that are connected at the top with a single oblong master link, resulting in a design that provides excellent load balance and control. Chapter 41 requirements for belowthehook lifting devices. The actual range of wire rope constructions is wide and varied. The rated capacity of a sling decreases as the leg angle increases. Standard length tolerance is plus or minus two rope diameters, or plus or minus 0. Proper rigging must restrict load rotation to avoid tipping and loss of load control. When dd ratios smaller than those listed in the rated capacity tables are necessary, the rated capacity of the sling must be decreased. If the shackle or object has at least 5x the sling diameter dd. Single part body, mechanicallyspliced wire rope slings flemish eye splice in the standard.
Wire rope slingcapacity chart wellworth wire ropes. Usha martin rope application spread all over the world is a testimony of its high quality products and. Crosbys full catalog and product listing of the wire rope sling capacities. See page 91 for reduced choker capacity when using these hook sizes. Wire rope sling splices there are three basic splice types. Wll f min x k t z p x g where f min is the minimum breaking force of the rope kilonewtons. The safe working load swl of a sling is the maximum load that may be lifted after considering the swl of the sling material, the reeving arrangement and the method of sling termination. Wire rope slings quality products the crosby group. Figure 5 illustrates the percentage of decrease to be expected. Ultraflexible slings for heavy with short connection lengths. Choose wire rope slings by diameter based on capacity ratings. Single part body mechanical splice slings have a higher rated capacity than hand spliced slings.
The capacity reduction factor is the cosine of the largest included angle between any leg and vertical. Basket hitch capacity based on minimum dd ratio of 251. Cable laid endless slingmechanical joint is a wire rope sling made. Unlike the simple return loop method that places 100%.
This reduction must be taken into account when determining the nominal sling strength and in calculating the rated capacity. Construction the main components of wire rope are shown below. Usha martin rope application spread all over the world is a testimony of its high quality products and services. When the sling body is bent around dd ratios smaller than 25, the sling rated capacity may be decreased. Fiber core ropes should not be subjected to degreas ing solvents. This chart illustrates how the stress in a sling increases as the angle increases all angles are measured from the vertical.
If the shackle or object has at least 5x the sling diameter dd 5. Bridle wire rope sling is a sling composed of multiple wire rope legs with the top ends gathered in a fitting that goes over the lifting hook. Home catalog rigging information wire rope sling capacities. The core serves as the foundation to hold the rope together. This dd ratio is applied to wire rope slings to assure that the strength in the body of the sling is at least equal to the splice efficiency. Single part body, mechanicallyspliced wire rope slings flemish eye.
The rated capacities for wire rope slings are based on a design factor of 5 per asme b30. Sling calculation using the breaking force of wire rope. We offer numerous body constructions for variety of applications and were happy to work. Chapter 41 requirements for belowthehook lifting devices, slings, and rigging hardware and accessories. As the rope size increases, for instance, a large number of wires can be used to achieve required fatigue resistance, and still those wires will be large enough to offer adequate. Allows for large lifting capacity in shorter sling.
General informationwire rope slings every lift uses 1 of 3 basic hitches. In the example above, each individual wire is arranged around a central wire to form a 7 wire strand. Vertical, or straight, attachment is simply using a sling to connect a lifting hook to a load. Single leg slings capacity tons multiple leg slings capacity tons.
Fiber core wire rope fc must not be used at tem peratures above 180f. When single leg slings are used either alone or in. Fit slings carefully, protect them from sharp edges and position hooks to face outward from the load. Calculating the load on each leg of a sling as the included angle between the legs of a. If there is evidence of defect or deterioration, remove the sling from service immediately. Inspect wire rope slings and accessories before use and before placing into storage. Requirements for belowthehook lifting devices, slings, and. Usha martin is known for manufacturing one of the widest range of wire rope products in the world. The wire rope sling capacity tables presented later in this section take these and other factorsincluding design factorinto account when presenting wire rope sling capacity. Basket hitches a basket hitch sling has twice the capacity of a single leg sling only if the dd ratio 25. Design factors have been established that allow the sling to give efficient service to the user. Quad leg wire rope slings are comprised of four lengths of wire rope that are connected at the top with a single oblong. For choker hitch, the angle of choke shall be 120 degrees or greater. Specify part number and length in feet when ordering wire rope dia.
Sisal rope strength sisal rope 3strand, minimum breaking strength and safe load. This dd ratio is applied to wire rope slings to assure that the strength in. Ungalvanised rope safe working load standard loop size eye inches dia mm 8 6 x 19 sc 650 kg 5 8 9 6 x 19 sc 800 kg 5 9. Rated load based on pin diameter no larger than one half the natural eye length or not less than the nominal sling diameter. Cable laid wire rope slings are manufactured using an ultraflexible 7 x 7 x 7 galvanized aircraft cable to offer more flexibility than a standard steel wire cable sling. Our sliding wire rope choker slings are also available with a latched choker hook by special order. The sudden release of a load can also damage a sling. Enter a page number in the box below to jump to a specific page.
These ends may also be cut shorter and served for smoothness. This is clearly impractical in many applications, and unnecessary if. Tests have shown that whenever wire rope is bent around a diameter, the strength of the rope is decreased. When lifting points are below the center of gravity, loads tend to be unstable. America s largest importerwholesaler of wire rope, chain and fittings. Any wire rope slings that have damage and have resulted in distortion of the structure including kinking, crushing, unstranding, bird caging, strand displacement, or core protrusion, must be removed from service. The legs of bridle slings, or matched slings are normally held to within one rope diameter. In addition to meeting the demanding environments as a standard sling, wire rope sling assemblies can also be braided into multiple parts making them more flexible and able to handle higher capacity by. Wire core wire rope iwrc must not be used at temperatures above 400f. Slings should not be used at angles of less than 30. A rope with wrc is approximately 11% heavier and 7. For a 26mm wire rope to escape bend fatigue the winch drum or block sheaves over which it runs would need a minimum diameter of over 1.
For sling angles other than those shown, use the rated load for the next lower angle or a. Single leg wire rope slings are just as they sound they are comprised of a single length of wire rope. Capacity of a sling used in a basket is affected by the bend, or curvature, where the sling body comes in contact with. The body of a wire rope sling should be protected with corner protectors, blocking or padding against damage by sharp edges or corners of a load being lifted. Rated load based on pin diameter no larger than one half the natural eye length or not less than the. When dd ratios smaller than those listed in the rated capacity. Wire rope slings cqre 2 wire rope is made up of three basic parts. The ropes manufactured by usha martin are today serving some of the most critical applications across diversified industrial segments. The rated capacity of a sling and what it means to you t. Vertical, or straight, attachment is simply using a sling to connect a lifting hook to a load full rated lifting capacity of the sling may be utilized, but must not be exceed.
Damage to slings can occur if the wrong size pin or hook is used. If the assembly is used as a sling, then the minimum recommended design factor of 5. Wire rope bridle slings bridle slings rope diameter in 14 516 minimum sling length eye hook cap tons rated capacity tons 600 450 30 2. Consideration shall be given to the effect of angles.
Wire rope slings alloy chain slings synthentic slings. Rated capacities based on pin diameter no larger than natural eye width or less than the nominal sling diameter. Capacity of a sling used in a basket is affected by the bend, or curvature, where the sling body comes in contact with the load just as any wire rope is affected and limited by bending action, as over a sheave. Sling capacity decreases as the angle from horizontal decreases. We offer numerous body constructions for variety of applications and were happy to work with any client that needs something specialized. Wire rope slings with an independent wire rope core iwrc can withstand contact and. Slings with wire rope bodies larger than 112 diameter are made only with burnt end splices in which the ends of strands are left exposed and then cut off with a torch.
The design factor and other factors are used to calculate the rated capacities. Introduction to wire rope slings dutest industries. Any time wire rope is disturbed such as in splicing an eye, the strength of the rope is reduced. The sling capacity reduction factor table gives reductions for angles of 00 to 90 from the horizontal, in 5 increments.
Wire rope slings sling angle and influence on capacity. Capacity the sling must be both long enough and strong enough for the load. Length tolerances single part wire rope slings standard length tolerance is plus or minus two rope diameters, or plus or minus 0. Sling angle is the angle measured between the horizontal plane and the sling leg or body. The wire rope sling users manual third edition is published by the wire rope technical board and is the culmination of a joint effort between the domestic wire rope manufacturers and members of the. Section 2 wire rope slings braid wire rope slings212 bridle slings 2 legged. Wire rope core is preferred for operating ropes in applications of high tensile stress, high compression loads on small drums. Dd ratios when a sling is rigged as a basket, the diameter of the bend where the sling contacts the load can affect the sling s lifting capacity. Cable laid endless sling mechanical joint is a wire rope sling made endless by joining the ends of a single length of cable laid rope with one or more metallic fittings. However, when a sling is bent around a small diameter, the outer pieces will stretch greatly, thus requiring a reduction in capacity. Wire rope slings, sometimes referred to as wire cable slings are more robust and durable than nylon slings and also have higher temperature limits.
The rated capacity of a wire rope sling is based upon the minimum breaking force mbf of the wire rope used in the sling and other 2 union a wireco worldgroup brand dd ratios when a sling is rigged as a basket, the diameter of the bend where the sling contacts the load can affect the slings lifting capacity. Rope diameter vertical choker vertical basket rated capacity in tons of 2,000 lbs. Iwrc rope has a higher rated capacity than fiber core rope for mechanically spliced slings, but the same rated capacity for hand tucked slings. Steel single leg wire rope slings us cargo control. Also sometimes known as one leg wire rope slings or single leg cable slings, these heavy duty lifting slings. Steel wool grades steel wool grades and fiber thickness. When selecting a sling to carry a given load, it is important to consider the angle at which the sling is going to be used.