steel wire rope breaking strength factory

Galvanized wire rope is categorized by number of strands in its construction. We supply most of them but we concentrate on the two major categories of galvanized (and ungalvanized or bright) wire rope. These “classes” are referred to as 6x19 and 6x36. Within each category of galvanized wire rope there are different “constructions” illustrated in the tables below.

Wire rope, galvanized and ungalvanized is used for many kinds of projects and applications. No matter the application galvanized wire rope must be used properly to insure the safest working conditions. All of our galvanized wire rope is manufactured to meet or exceed Federal Specification RRW-410 and is mill certified.

All of these general purpose wire ropes are available in full reels, custom cut sizes or as part of a custom made wire rope sling. Contact us today for more information.

Galvanized wire rope also comes in different strength categories (IPS and EIPS) and different cores (FC or fiber core and IWRC or independent wire rope core). Relevant data for each is listed in the table below.

The wires of wire rope are made of high-carbon steel. These carbon steel wires come in various grades. Wire ropes are usually made of Extra Improved Plow Steel (EIPS) or Extra Extra Improved Plow Steel (EEIPS) which roughly equivalents to a wire tensile strength of 1960N/mm² and 2160N/mm².

The fill factor measures the metallic cross section of a rope and compares this with the circumscribed area given by the rope diameter. Traditional rope constructions ‘fill’ the rope diameter only up to about 58% with steel. Python® and Compac® wire rope ‘fill’ the rope diameter up to 80% with steel. That is an metallic increase of about 38% which results in a similar increase in rope strength.

Jiangsu ZHIJIA Steel Industries Co.Ltd. has been operating for more than five years. Our company is located in Wuxi, Jiang Su which is China"s largest stainless-steel processing center. Our company has its own factory, it provides a one-touch service for cutting, forming and surface processing of stainless steel products.

ZHIJIA STEEL has more than 10 years" experience in serving stainless steel industries, including green energy, kitchenware and household appliance,petrol-chemical,shipbuilding,transit equipment like Auto and CRH（China Railway High-speed),and medical facility etc.,and our products are widely used for heat-exchange pipe and tube,cookware and tableware,pressure vessel,petrochemical tank,precision electronic instrument,solar water heater Automobile / Automobile parts etc.

TSINGSHAN,DELONG,YONGJIN,HONGWANG,JISCO,QPSS mills, and our products include 200/300/400 series and duplex stainless steel coil and sheet,and regular stock are 10,000 tons.

It turns out that there is little margin of safety with steel cable equipped winches. Why is this? Unlike the lifting industry, the recreational pulling industry is unregulated, consequently winch manufacturers typically equip winches with steel cables with minimum breaking strengths that are very close to the max winch capacities. The lifting industry requires a 5:1 safety factor due to the overhead dangers. The pulling industry does not. In fact many steel equipped winches possess a safety factor of less than 1.5!

Take for instance common 5/16 steel cable supplied on most winches up to 10K capacities. The working load limit (WLL) on common 5/16 steel cable is only 2000 pounds. The minimum breaking strength is approximately 10K pounds. So in many cases a 10K winch can be supplied with a steel cable with a minimum breaking strength of 10K. Take a look at the steel cable writeup from our friend Tyler at Roundforge (Roundforge.com) for more comprehensive data on steel cable types and classes.

One of the reasons that cable failures are relatively infrequent is mostly due to vehicle recoveries being in the 4-5k pulling load range, well below the cable breaking strength. Also, often times steel cables can possess ultimate strengths above the minimum breaking loads. So what’s the takeaway here? Due to the little margin of safety in steel cables, make sure you properly maintain the cable and be on the lookout for weakening factors like kinks, broken wires etc., and when possible use a snatch block to reduce the cable load.

Picture supplied by our friend James Pickard. James snapped his steel cable while using the UltraHook. The UltraHook possesses a breaking strength of 31,000 pounds(hook opening) to 48,000 pounds(shackle pin mount). Engineering facts matter.

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It is because of the versatility of wire rope that engineers must be deeply educated on tensile strength, as well as the impact that wire rope diameter and strand constructions can have on tensile strength, along with other critical characteristics such as cycle count and flexibility.

All wire ropes are tested for breaking strength. Motion cables have a minimum breaking strength requirement, which is determined by the material, diameter and construction of the wire rope. At Carl Stahl Sava Industries, wire rope is tested on tensile strength equipment. Either or both the wire rope itself can be tested against the minimum load requirement, or the fittings swaged to the wire rope can be similarly tested for their holding strength on the cable.

To ensure wire rope stays within its specified tensile limits, engineers will derate the minimum cable tensile strength by a safety factor. This is how engineers arrive at what is known as the Working Load Limit or WLL. The WLL safety factor of each cable being tested is application specific, but often times a factor of 3 to 5 is utilized. Divide the minimum tensile strength by the safety factor to calculate the safe working load limit for a specific cable.

Steel cables are made more durable in part due to a manufacturing process known as cold working or cold forming, where the material is shaped below its recrystallization temperature. Cold worked steel distorts the steel’s crystal grains in the flow of the metal, resulting in hardening of the material, thus strengthening it. Due to steel’s natural strength, combined with its well-known resistance to corrosion, engineers turn to steel cables for applications where exposure to harsh environments does not compromise wire rope integrity.

At Sava, we ensure that our steel cables are manufactured using 304, 305 and 316 stainless steel, all of which significantly reduce the risk of corrosion, apart from those exposed to seawater. The general rule of thumb, however, is that engineers should never exceed the manufacturer"s limitations when using steel cables.

Although commonly mistaken for stranded cable, braided cable refers to the braided wrapping or insulation found in conductive cables, such as those transmitting power or data. This braided “jacket” insulates and strengthens the conductive, data or electric cable, making it more tolerant to time in the field, along with the twisting, turning and rolling to which braided cable is commonly exposed. Sava does not manufacture braided cable or other conductive cable, like coaxial and network cable, as none of these cables, commonly braided in nature, actuate motion.

Interestingly, even Google machine learning algorithms struggle to understand the differences between motion cable, such as steel wire rope or tungsten mechanical cable, and cables that transmit electricity or information. When a searcher uses Google or other common search engines like Bing or Yahoo! to find steel cable manufacturers like Sava, or for that matter, a maker of braided cable, the search engine confuses the two and often serves the wrong cable to the searcher.

Wire rope manufacturers offer a wide range of what is known as “cable constructions,” which characterizes the number of individual wires used to stranded the wire rope. Consequently, most wire rope comprises a center or “core” wire, that is then wrapped in more wires, thus completing the stand’s construction. In the case of a 1x7 steel cable construction, the core wire represents wire #1, wrapped in six additional wires. Hence 1x7 steel cable.

In many cases, that same 1x7 steel cable is then used as the core in the manufacture of larger, stronger and more durable steel cable. For instance, 7x19 steel cable strand comprises the original seven wires, or 1x7 strand, and is wrapped in 12 more wires, thus making a 7x19 construction. Said another way, the 7x19 wire rope consists of the original 1x7 strand, plus 12 additional wires, making for a total of 19 wires.

Less seldom are wire rope constructions that do not include a core wire. In these cases, take 3x7 cable construction for instance, three, 1x7 stranded wire ropes are wrapped around one another, forming a triangular-shaped wire rope construction.

Sava offers a wide array of cable constructions, manufactured in stainless steel, galvanized steel, coated or bare, as well as tungsten cables and those made from other more exotic materials. For a quotation on any product on our catalog or further assistance, get in touch with our team of engineers. At Sava, we offer the highest quality materials at affordable rates. Contact us today to get started.

Wire ropes are essential for safety purposes on construction sites and industrial workplaces. They are used to secure and transport extremely heavy pieces of equipment – so they must be strong enough to withstand substantial loads. This is why the wire rope safety factor is crucial.

You may have heard that it is always recommended to use wire ropes or slings with a higher breaking strength than the actual load. For instance, say that you need to move 50,000 lbs. with an overhead crane. You should generally use equipment with a working load limit that is rated for weight at least five times higher – or 250,000 lbs. in this case.

This recommendation is all thanks to the wire rope safety factor. This calculation is designed to help you determine important numbers, such as the minimum breaking strength and the working load limit of a wire rope.

The safety factor is a measurement of how strong of a force a wire rope can withstand before it breaks. It is commonly stated as a ratio, such as 5:1. This means that the wire rope can hold five times their Safe Work Load (SWL) before it will break.

So, if a 5:1 wire rope’s SWL is 10,000 lbs., the safety factor is 50,000 lbs. However, you would never want to place a load near 50,000 lbs. for wire rope safety reasons.

The safety factor rating of a wire rope is the calculation of the Minimum Break Strength (MBS) or the Minimum Breaking Load (MBL) compared to the highest absolute maximum load limit. It is crucial to use a wire rope with a high ratio to account for factors that could influence the weight of the load.

The Safe Working Load (SWL) is a measurement that is required by law to be clearly marked on all lifting devices – including hoists, lifting machines, and tackles. However, this is not visibly listed on wire ropes, so it is important to understand what this term means and how to calculate it.

The safe working load will change depending on the diameter of the wire rope and its weight per foot. Of course, the smaller the wire rope is, the lower its SWL will be. The SWL also changes depending on the safety factor ratio.

The margin of safety for wire ropes accounts for any unexpected extra loads to ensure the utmost safety for everyone involved. Every year there aredue to overhead crane accidents. Many of these deaths occur when a heavy load is dropped because the weight load limit was not properly calculated and the wire rope broke or slipped.

The margin of safety is a hazard control calculation that essentially accounts for worst-case scenarios. For instance, what if a strong gust of wind were to blow while a crane was lifting a load? Or what if the brakes slipped and the load dropped several feet unexpectedly? This is certainly a wire rope safety factor that must be considered.

Themargin of safety(also referred to as the factor of safety) measures the ultimate load or stress divided by theallowablestress. This helps to account for the applied tensile forces and stress thatcouldbe applied to the rope, causing it to inch closer to the breaking strength limit.

A proof test must be conducted on a wire rope or any other piece of rigging equipment before it is used for the first time.that a sample of a wire rope must be tested to ensure that it can safely hold one-fifth of the breaking load limit. The proof test ensures that the wire rope is not defective and can withstand the minimum weight load limit.

First, the wire rope and other lifting accessories (such as hooks or slings) are set up as needed for the particular task. Then weight or force is slowly added until it reaches the maximum allowable working load limit.

Some wire rope distributors will conduct proof loading tests before you purchase them. Be sure to investigate the criteria of these tests before purchasing, as some testing factors may need to be changed depending on your requirements.

When purchasing wire ropes for overhead lifting or other heavy-duty applications, understanding the safety dynamics and limits is critical. These terms can get confusing, but all of thesefactors serve an important purpose.

Our company has served as a wire rope distributor and industrial hardware supplier for many years. We know all there is to know about safety factors. We will help you find the exact wire ropes that will meet your requirements, no matter what project you have in mind.

6x36 is a flexible general engineering wire rope readily available in galvanised, ungalvanised and marine grade stainless steel. The wire rope has an equal lay construction (warrington seale) and achieves a superior breaking load to the 6x19 construction range. The construction has been designed to give a flexible rope with a good fatigue life. A 6x36 wire rope is available with either FC (fibre core) or IWRC (independent wire rope core) and is used for a wide range of applications, examples of which are shown below:

· 【1700 LBS BREAKING STRENGTH】- Length: 500 ft. Diameter: 1/8 inch. Our wire rope has a breaking strength of 1700 lbs and a working strength of 1200 lbs. It allows for a variety of hanging, strapping and DIY activities.

· 【T316 STAINLESS STEEL】- Our wire rope cable is made of high-strength 316 stainless steel material, enhancing the resistance to wear, rust, and other corrosion and ensures durability and longevity.

· 【7x7 CONSTRUCTION】- Constructed of 7x7 construction, 7 groups of 7 strands braided together to form the cable, this braided steel wire has a strong enough core to ensure long service life and can be cut to any size without loosening the joint.

· 【SAFE TO USE】- The stainless steel rope features a smooth surface, high polish, and no burr, protecting your hand and avoiding hurting and damaging your belongings. A wire cutter, 20pcs of the aluminum sheath, and 10pcs of capels are included.

· 【MULTIPURPOSE WIRE ROPE】- Our wire cable is perfect for indoor and outdoor use. It is a multifunctional wire rope that can meet your daily needs, like garden fencing, supporting your plants, stair handrails, string lights, clothesline, etc.