steel wire rope lifting capacity chart brands

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 exceeded. A tagline should be used to prevent load rotation, which may damage a sling.

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.

CHOKERhitches reduce lifting capability of a sling since this method of rigging affects ability of the wire rope components to adjust during the lift. A choker is used when the load will not be seriously damaged by the sling body — or the sling damaged by the load, and when the lift requires the sling to snug up against the load.

The diameter of the bend where the sling contacts the load should keep the point of choke against the sling BODY — never against a splice or the base of the eye. When a choke is used at an angle of less than 120 degrees (see next page), the sling-rated capacity must be adjusted downward.

Anytime pull is exerted at an angle on a leg—or legs—of a sling, the load per leg can be determined by using the data in the table above. Proceed as follows to calculate this load—and determine the rated capacity required of the sling, or slings, needed for a lift.First, divide the total load to be lifted by the number of legs to be used. This provides the load per leg if the lift were being made with all legs being vertically.

Then MULTIPLY the load per leg (as computed above) by the Load Factor for the leg angle being used (from the table at the bottom) – to compute the ACTUAL LOAD on each leg for this lift and angle. THE ACTUAL LOAD MUST NOT EXCEED THE RATED SLING CAPACITY.

The horizontal angle of bridles with 3 or more legs is measured the same as the horizontal sling angle of 2-legged hitches. In this case, where a bridle designed with different leg lengths results in horizontal angles, the leg with the smallest horizontal angle will carry the greatest load. Therefore, the smallest horizontal angle is used in calculating actual leg load and evaluating the rated capacity of the sling proposed.

On the other hand, the eye should always be used on a hook or pin with at least the nominal diameter of the rope—since applying the D/d Ratio shows an efficiency loss of approximately 50% when the relationship is less than 1/1.

When rigged as a basket, DIAMETER of the bend where a sling contacts the load can be a limiting factor on sling capacity. Standard D/d ratios— where “D” is the diameter of bend, and “d” the diameter of the rope—are applied to determine efficiency of various sling constructions, as indicated below:Mechanically Spliced, Single-Part Slings: 25 times rope diameter

Whether to use a single-part sling (one made of a single wire rope in the sling body) or a multi-part sling (several ropes in the body) is usually the first decision to make after determining the sling length and capacity for a lift.

The starting point for this decision involves the handling characteristics of the sling more than any other factor. Based on capacity alone, multi-part slings will be more flexible…more easily handled…than single-part slings. The larger the capacity of a sling, the more important this becomes…to the point, it becomes unrealistic to build big capacity slings from single, very large wire ropes.

In the design of the sling, rope engineers must seek a balance between strength-handling characteristics and number of parts…since there is a tendency to lose strength as core parts are added to increase flexibility.

If a load is hanging free, the normal choke angle is approximately 135 degrees. When the angle is less than 135 degrees, an adjustment in the sling-rated capacity must be made. Choker hitches at angles greater than 135 degrees are not recommended since they are unstable.

This is the length of wire rope between splices, sleeves or fittings. Generally, the minimum body length is equal to ten (10) times the sling body diameter. This allows approximately one and one half (1-1/2) rope lays between splices. For Multi-part slings, the minimum body length between splices is equal to forty (40) times the component rope diameter.

We offer Wire Rope Sling that are mainly used for transporting and shifting of load.These are highly acclaimed for features like durability, hardness and tensile strength. The sling is used in construction, marine and automobile industry. The range is also customized as per specification of client.

DuPont™ Kevlar® brings together the strength, temperature resistance, lightness, and flexibility manufacturers need for their ropes and cables for land, sea, and space applications.

For more than two decades, DuPont™ Kevlar® brand aramid fiber has provided a lightweight, flexible, and dimensionally stable means of helping to strengthen ropes and cables used across several industries, from mountaineering ropes and fishing lines to electro-mechanical cables and fine gauge cables for electronic device applications such as mobile phone cables, computer power cords, USB cords, and MP3 earphone cables. Ropes and cables made of Kevlar® help deliver performance and value to customers in the fine gauge cable industry by providing excellent robustness, fatigue resistance, shrinkage, and durability. The fiber’s resistance to chemicals and temperature extremes makes it an ideal component for ropes and cables under severe loads in harsh environments, from the bottom of the ocean to the surface of Mars. Ropes made with Kevlar® brand fiber appear in a variety of constructions, including 4-strand, wire lay, braided and parallel yarns, and strand ropes. They range in diameter from 1mm to 250mm, and have been strength-rated up to 1500 tons.

On landArchitects, engineers, and builders incorporate cables of Kevlar® into light suspension bridges because Kevlar® is stronger and lighter than steel on an equal-weight basis, and does not corrode. Cables made of Kevlar® help enable elevators t use to use smaller pulleys than they would have to use for steel cables, and subsequently require less energy and space to operate. Additionally, it is possible to have longer cable lengths because of the lightweight, high-strength properties.

At seaIn seawater, ropes with Kevlar® are up to 95% lighter than steel ropes of comparable strength. Salvage ropes, ice safety barriers, towed and stationary arrays, umbilical hoses, fiber optic cables, escape chutes, orbital straps, and tow ropes have incorporated Kevlar® to help increase strength and reduce weight. Lightweight rope constructions based on Kevlar® fiber help enable rescue services to handle and deploy equipment far more easily — often saving valuable seconds.

In spaceKevlar® fiber has proven that it is strong enough to survive the extreme forces and temperature fluctuations of space travel. When the Mars Pathfinder landed on the surface of Mars, ropes made of Kevlar® helped secure the inflated landing cushions (which were themselves reinforced with Kevlar® fiber) that allowed it to complete its 40-million-mile journey fully intact and ready to explore the planet. Kevlar® is also used in the space shuttle to help protect against impacts from orbital debris.

If you’re in the rigging industry, you’ve likely had similar thoughts. Over the next few weeks, we’ll talk repeatedly about what the future of our field might look like. Today, we want to talk specifically about wire rope slings.

These flexible steel cords have become commonplace in hoisting, towing, and anchoring projects. However, a decrease in all rigging equipment purchases has many wire rope sling manufacturers asking, “What does the future of this product look like?”

As key producers of wire rope slings in the rigging industry, we at Holloway Houston Inc. want to take a look at the growing importance of wire rope slings and what we can expect from them over the next couple of years – if not longer.

The first thing we need to address is the division between galvanized wire ropes and stainless steel wire ropes in the sling industry. Wire rope slings might be an overall popular rigging tool, but in order for manufacturers to make smart bets about the future, we need to understand both types and how they’re useful.

Stainless steel wire ropes are also corrosion-resistant but more durable when it comes to harsh environmental conditions. Stainless steel can even withstand long exposure to saltwater and acid.

Generally, manufacturers who produce galvanized wire ropes sell predominantly to the aircraft industry. In fact, the 7×7 galvanized wire rope has been dubbed the “aircraft cable” because of its tough construction and flexibility.

On the other hand, stainless steel wire ropes are the best option for work sites that need the strongest product. It’s known for its high durability and safety features, which means many of the best brands for lifting accessories are interested in producing stainless steel options for years to come.

All things considered; we see places for both kinds of wire rope slings in the near future. Still, we’ll continue to monitor trends in one direction or the other.

A big part of understanding the future of wire rope slings is looking at their current usage. Right now, most companies are using wire rope slings because they are:

One big industry that seems to benefit substantially from these features is offshore service. Almost every aspect of offshore (and subsea) operations involves some sort of lifting, whether its a complicated heavy lift or a simple movement of stores and spares.

Wire rope slings, especially when made of stainless steel, are the perfect rigging slings for coastal or at-sea conditions. They’re resistant to salt abrasion and strong enough to handle the enormous loads of many marine job sites. There are even certified divers that use wire rope slings to confidently tackle difficult lifting operations under the ocean waves.

Still, between 2019 and 2025, it’s estimated that oil demand will increase. A higher increase for oil means more rigging projects on drilling platforms – and therefore more use of highly durable, strong wire rope slings.

You’ll also find that many construction sites rely heavily on wire rope slings. They need durability and resistance – especially in harsh weather conditions.

In the future, our teams at Holloway Houston Inc. predict that wire rope slings will continue to become increasingly customizable as we learn to make them more resistant to moisture, heat, UV rays, and a variety of chemicals.

The slowdown in world economic growth has certainly thrown a wrench into many manufacturers’ budgets and sales. However, wire rope slings sales have maintained a relatively optimistic growth rate for years, and we expect to see a steady demand for the product – pandemic or not.

Some experts, according to the Wire Rope Slings Sale Market Size 2020 Analysis, even believe that in the next few years, the wire rope slings sales market will rise at a considerable rate.

Considering that, our teams at Holloway Houston Inc. will continue to include wire rope slings in our rigging equipment designs and sales for the foreseeable future.

Making any kind of prediction is difficult during 2020, but we feel confident in the continuous demand for wire rope slings as one of the most reliable pieces of rigging hardware.

As always, every sling purchased at Holloway Houston Inc. comes with a complete data book to ensure traceability. They also have stainless steel tags marked with invoice numbers, so you always know exactly which product you’re working with during a rigging project.

If you have any questions about wire rope slings or other kinds of rigging equipment, please call 713-674-8352. You can also reach out via our contact page. Our rigging and lifting manufacturing experts are always ready to help.