steel wire rope lifting capacity chart quotation

METRIC WIRE ROPES- 6 x 36 wire rope is a more flexible cable wire than 6 x 19 wire rope since it has a higher number of wires per strand. Some of the most common uses are winch lines, choker and boom lines, and works well in marine environments.

* EIPS (Extra Improved Plowed Steel) wire rope has roughly 10% more strength than regular IPS. Independent wire rope core ( IWRC ) provides added strength, reduces the amount of stretch. IWRC wire rope also is resistance to heat and provides extra corrosion resistance over a typical bright wire finish.

Rated load based on pin diameter no larger than one half the natural eye length or not less than the nominal sling diameter. Basket hitch capacity based on minimum D/d ratio of 25/1. For choker hitch, the angle of choke shall be 120 degrees or greater. 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. Horizontal sling angles of less than 30 degrees are not recommended. The capacity of a bridle at a 30 degree horizontal is same as single vertical leg.

Large Loads Require Large Slings Whatever the load you are lifting. YuanBo Wire Rope Factory can supply a steel wire rope sling to do the task. Sling up to 12" (305mm) diameter can be supplied with minimum braking loads up to tons. There arethree distinct types of Wire Rope Sling.

Slings manufactured from cable laid ropes, 4" diameter to 12" diameter. hand spliced or by combination of hand splicing and socketing with eye at each end.

Slings manufactured from 6 strand equal laid ropes. up to 3.5 " diameter with soft eyes spliced each end. terminated by either hand splicing or mechanical means.

The most common size: wire rope slings having soft eyes at both end used for heavy lifting operations with safety factor of 7, length 6m, 12m, 16m, 20m, and the swl from 5 ton to 40 ton.

Type 304 stainless steel is the standard alloy for use in wire rope and cable. It has about the same strength as galvanized rope or cable but is much more corrosion resistant. It can be used in most industrial atmospheres and has acceptable corrosion resistance when used in marine and salt water.

Type 316 stainless steel is the standard high corrosion resistant steel for rope and cable. It is resistant to many chemicals in the pulp and paper, photographic, food processing and textile industries. It has the best pitting resistance in marine and salt water and can be used in temperatures up to 480ºC (900ºF).

Rope strength is a misunderstood metric. One boater will talk about tensile strength, while the other will talk about working load. Both of these are important measurements, and it’s worth learning how to measure and understand them. Each of these measurements has different uses, and here we’re going to give a brief overview of what’s what. Here’s all you need to know about rope strength.

Each type of line, natural fiber, synthetic and wire rope, have different breaking strengths and safe working loads. Natural breaking strength of manila line is the standard against which other lines are compared. Synthetic lines have been assigned “comparison factors” against which they are compared to manila line. The basic breaking strength factor for manila line is found by multiplying the square of the circumference of the line by 900 lbs.

Just being able to calculate breaking strength doesn’t give one a safety margin. The breaking strength formula was developed on the average breaking strength of a new line under laboratory conditions. Without straining the line until it parts, you don’t know if that particular piece of line was above average or below average. For more information, we have discussed the safe working load of ropes made of different materials in this article here.

It’s very important to understand the fundamental differences between the tensile strength of a rope, and a rope’s working load. Both terms refer to rope strength but they’re not the same measurement.

A rope’s tensile strength is the measure of a brand-new rope’s breaking point tested under strict laboratory-controlled conditions. These tests are done by incrementally increasing the load that a rope is expected to carry, until the rope breaks. Rather than adding weight to a line, the test is performed by wrapping the rope around two capstans that slowly turn the rope, adding increasing tension until the rope fails. This test will be repeated on numerous ropes, and an average will be taken. Note that all of these tests will use the ASTM test method D-6268.

The average number will be quoted as the rope’s tensile strength. However, a manufacturer may also test a rope’s minimum tensile strength. This number is often used instead. A rope’s minimum tensile strength is calculated in the same way, but it takes the average strength rating and reduces it by 20%.

A rope’s working load is a different measurement altogether. It’s determined by taking the tensile strength rating and dividing it accordingly, making a figure that’s more in-line with an appropriate maximum load, taking factors such as construction, weave, and rope longevity into the mix as well. A large number of variables will determine the maximum working load of a rope, including the age and condition of the rope too. It’s a complicated equation (as demonstrated above) and if math isn’t your strong point, it’s best left to professionals.

However, if you want to make an educated guess at the recommended working load of a rope, it usually falls between 15% and 25% of the line’s tensile strength rating. It’s a lotlower than you’d think. There are some exceptions, and different construction methods yield different results. For example, a Nylon rope braided with certain fibers may have a stronger working load than a rope twisted out of natural fibers.

For safety purposes, always refer to the information issued by your rope’s manufacturer, and pay close attention to the working load and don’t exceed it. Safety first! Always.

If you’re a regular sailor, climber, or arborist, or just have a keen interest in knot-tying, be warned! Every knot that you tie will reduce your rope’s overall tensile strength. Some knots aren’t particularly damaging, while others can be devastating. A good rule of thumb is to accept the fact that a tied knot will reduce your rope’s tensile strength by around 50%. That’s an extreme figure, sure, but when it comes to hauling critical loads, why take chances?

Knots are unavoidable: they’re useful, practical, and strong. Splices are the same. They both degrade a rope’s strength. They do this because a slight distortion of a rope will cause certain parts of the rope (namely the outer strands) to carry more weight than others (the inner strand). In some cases, the outer strands end up carrying all the weight while the inner strands carry none of it! This isn’t ideal, as you can imagine.

Some knots cause certain fibers to become compressed, and others stretched. When combined together, all of these issues can have a substantial effect on a rope’s ability to carry loads.

Naturally, it’s not always as drastic as strength loss of 50% or more. Some knots aren’t that damaging, some loads aren’t significant enough to cause stress, and some rope materials, such as polypropylene, Dyneema, and other modern fibers, are more resilient than others. Just keep in mind that any knots or splices will reduce your rope’s operations life span. And that’s before we talk about other factors such as the weather or your rope care regime…

Flexibility and handling ease for rigging large lifts are the main benefits of the 9-PART Slings. The 9-Part sling is made by laying wire rope continuously through both eyes and the sling body. This results in a body formed with nine parts.

The improved efficiency of the 9-Part Super-Flex slings is backed with a proven design that provides internal adjustment to distribute the load among all nine parts of the sling body. The 9-Part sling is made by laying wire rope components continuously through both eyes and the sling body. This results in a body with improved flexibility and handling ease for rigging large lifts. Only two splices occur in the entire sling-where the component rope ends are spliced at the eyes. The sling construction makes it possible to easily inspect all parts of the sling before and after each lift, which is important to remember if the sling is to be used many times.

When a sling body must conform to a tight choke hitch or must bend in a tight radius, such as around a pin or post, a 9-Part construction may be the most suitable since it can develop greater lifting capacity from a smaller component rope.