1x7 (7 wires)
This is the basic strand construction, which is used in different combinations to construct another strand or other cables. It is somewhat stiff in larger diameters.
When the 10,000th cable assembly needs to possess the exact same commitment to quality that did the first, not just any cable manufacturer will do.
At Carl Stahl Sava Industries we know that meeting your needs takes more than simply holding an ISO 9001:2015 certification, following RoHS and REACH standards or maintaining FDA and ITAR registered status.
Manufacturing world-class, custom cable assemblies is about tailoring the cable manufacturer's capabilities to meet your unique needs, no matter your industry. At Sava, we do just that. Sava works with a wide range of materials, diameters, constructions and extruded coatings for your cable assemblies.
In addition to manufacturing cables that support a variety of applications, Carl Stahl Sava Industries understands that the right solutions provider is one that can handle all of your wire rope and miniature cable assembly needs. That’s why every Sava customer is assured a complete experience, from producing the assembly and ensuring its quality, to building it on time, as well as packaging and shipping it within your deadlines. Take a look below at just how we make our customers the center of attention.
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Before making your cable decisions, why not consult Sava's rich and detailed cable resource guide below? Go ahead and click on an option to find detailed information designed to guide you through your request for our cable and manufacturing services.
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Stainless steel or galvanized steel strand, wire rope or cable stainless steel or galvanized steel strand, wire rope or cable, is a uniform helical arrangement of wires, concentrically stranded together for a variety of operating conditions. These constructions have different properties, which are designed for specific applications.
The strand constructions afford increased abrasion resistance and less flexibility. Small cable sizes are useful in medical applications, such as in polyp and gallstone removal, endoscopy procedures, light guying and lanyards. In larger cable sizes, the cable is used as guy strand, standard rigging on boats and other applications where flexibility of the cable is not essential.
Cable construction having more wires are consequently more flexible, with less abrasion resistance. This type of construction is used in industrial, appliances, boating, instrumentation, aviation, agriculture, hobbies, medical, recreation and many more applications.
When stranding two or more wires laid together – the construction is normally referred to as 1 x the number of wires involved; i.e., 1x7, 1x19, etc.
This is the basic strand construction, which is used in different combinations to construct another strand or other cables. It is somewhat stiff in larger diameters.
Stronger and more flexible than 1x7, affording still better properties.
The construction of cable with three or more strands laid together is normally referred to by the number of strands, x the number of wires in each strand (for example–7x7–see below).
A combination of three 1x7 strands. Very flexible in small diameters.
A combination of seven 1x7 strands, affording abrasion resistance and flexibility through a wide range of diameters.
A combination of seven 1x19 strands, producing a fine combination of strength and flexibility in a wide range of sizes.
A combination of seven 7x7 strands, making it a cable with extraordinary flexibility, for use over small pulleys.
Proof loading of cable assemblies serves two purposes - first, it ensures the integrity of the assemblies, and second, it prestresses the cable, removing some of the constructional stretch. Proof loading is generally done at 60% of rated breaking strength. The removal of constructional stretch means that frequent adjustments are not necessary to maintain proper tension in a control system. After assemblies are proof loaded, subsequent handling should be held to a minimum, otherwise the prestressing effect will be partially removed. If stretch is critical in your application, we suggest contacting Sava's engineering department for further information.
| Nominal Coating Diameter | Coating O.D. Tolerance | ||
| inches | mm | inches | mm |
|---|---|---|---|
| .010 - .035 | .25 - .90 | +.004 -.000 | +.10 -.00 |
| .036 - .065 | .91 - 1.65 | +.008 -.000 | +.20 -.00 |
| .066 - .130 | 1.66 - 3.00 | +.012 -.000 | +.30 -.00 |
| .131 - .260 | 3.31 - 6.60 | +.018 -.000 | +.45 -.00 |
| .261 - .380 | 6.61 - 9.65 | +.024 -.000 | +.60 -.00 |
| .381 - .500 | 9.66 - 12.70 | +.032 -.000 | +.80 -.00 |
| Nominal Cable Diameter | Cable O.D. Tolerance | ||
| inches | mm | inches | mm |
|---|---|---|---|
| .006 - .020 | .15 - .50 | +.002 -.000 | +.05 -.00 |
| .021 - .035 | .51 - .90 | +.004 -.000 | +.10 -.00 |
| .036 - .065 | .91 - 1.65 | +.008 -.000 | +.20 -.00 |
| .066 - .095 | 1.66 - 2.40 | +.010 -.000 | +.25 -.00 |
| .096 -.130 | 2.41 - 3.30 | +.014 -.000 | +.35 -.00 |
| .131- .260 | 3.31 - 6.60 | +.018 -.000 | +.45 -.00 |
| .261 - .380 | 6.61 - 9.65 | +.026 -.000 | +.65 -.00 |
1Coating for cables up to 1/16 diameter is nylon 11, which is designed for superior fatigue life in thin wall applications, in both high and low temperature ranges and has excellent abrasion resistance. Nylon 12 is used on cables 3/32 and larger. This is also a superior grade resin, slightly less expensive, yet has good flexibility, excellent abrasion resistance and works well with larger diameter cables with greater bearing surfaces.
2The vinyl coating part numbers refer to clear vinyl only. Color choices are available for a nominal additional charge. Vinyl is another popularly used coating in cables over 3/32 in diameter. It is more flexible than most coatings, has excellent resistance to sunlight and is less expensive.
3The most common coating diameters are shown. Contact Sava if you have a special application.
4Extrusion resins contain UV inhibitors for use in limiting sunlight exposure over time.
To Optimize Life
1Select a cable that has a minimum breaking strength of 10 times the working load.
2Should a pulley be utilized, see our pulley diameters chart on our pulleys expertise page to ensure you are using the proper pulley diameter.
After you have determined the maximum tension on the cable and selected the cable diameter and pulley for your application, apply the numbers to the formula below to determine the cable load factor. Read the anticipated cycle life from the chart provided below.
Note: A system frequently cannot be designed for optimum conditions. The formula and chart below show that a trade-off can be made between cable size, pulley size and life.
The numbers on the following chart were determined under laboratory conditions and are intended to serve as a guide. Since there is considerable variation in application, we recommend actual life tests for your intended use.
Two kinds of stretch occur in cable: constructional stretch and elastic stretch. They are due to two different causes and are discussed below.
When strand and cable are made, the load at the closing head is light. Therefore, there are small clearances between the wires and strands, and between the strand and the core. The application of initial load causes wires and strands to seat properly, and a slight overall elongation of the strand or cable accompanies this section. The amount of constructional stretch is not constant for all cables, as it depends on such variables as type of construction, length of lay and other factors, including the load applied.
Elastic stretch is the actual elongation of the wires of a strand or a cable. This is caused by the application of a load, up to the yield point of the metal, and the stretch is approximately proportional to the load applied. When the load is released, strand or cable subjected to elastic stretch returns to its approximate original length, providing the stretch has not exceeded its yield point.
Where the elimination of as much stretch as possible is important, the cables or assemblies can be proof loaded to remove most of the constructional stretch. For assemblies, this process also verifies the holding strength of the terminals. Proof loading is usually done by applying a 60% load to the cable or assemblies. This load is based on the minimum breaking strength of the cable or fittings, whichever is lower. After prestretching, minimize handling of the cable.
| Cable Factor = | (Tension on Cable / (Bare Cable dia. x Pulley Root dia.) |
|---|---|
 7x7 Construction Nylon Coated | Curve for part nos. 2014SN, 2018SN, 2027SN, 2031SN, 2036SN, 2048SN, 3048GN, 2064SN, 2094SN, 3064GN, 3094GN |
 3x7 Construction Nylon Coated | |
 7x19 or 7x49 Construction Nylon Coated | Curve for part nos. 2019SN, 2024SN, 2032SN, 2037SN, 2038SN, 2045SN, 2047SN, 2050SN, 2054SN, 2065SN, 2095SN, 3065GN, 3095GN |
 7x7 Construction Uncoated | Curve for part nos. 2018, 2027, 2031, 2036, 2046, 2048, 2064, 2094, 3048, 3064, 3094 |
Determine the cable size, pulley diameter and cycle life for a counterweight system working with a load of 15 lbs. Anticipated life of cable should be 2,000,000 cycles.
1Select a cable from the Stainless Steel Cable, Nylon, and Vinyl Coated page of our catalog, which has a breaking strength of 10 times the load. Cables 2036, 2037, and 2038, .036? diameter, qualify.
2Multiply cable diameter .036? by 40 for pulley groove diameter. .036? x 40 = 1.44?
3Cable Factor = 15 / ( .036 x 1.44 ) = 289
Applying this factor to the cable fatigue life chart, it is seen that a 7x7 bare cable will have an expected cycle life of only 400,000 cycles, which is not sufficient. When a nylon-coated cable (2036SN) is selected, the cable factor line will not intersect the curve on the cable for a 7x7 or 7x19 coated. The 7x7 coated cable (2036SN) is less expensive than 7X19 coated cable (2037SN) and would be the logical choice.
Nylon coated miniature stainless steel cables; P/N 2018SN through P/N 2065SN are impregnated with our specially formulated lubricant, which results in substantially improved fatigue life. For other lubricated cables, please consult with our sales team.
The coating of cables with nylon, vinyl, FEP or other plastics offers a number of advantages. The plastic protects the wire from abrasion and chemical attack. It seals in the lubrication and seals out moisture, dirt and grit. It cushions the cable from shock and pressure, protects pulleys from abrasion and is easy to clean. Generally, in fatigue applications, using nylon, working life is increased 300% to 1000%.
To arrive at the working load of a cable, the normal load, as well as additional stresses caused by acceleration, shock and bending must be considered. A safety factor should be applied, taking into consideration both the cost and the dangers, which could result from failure. Where cable is stationary, a factor of 3.5 times is usually safe. In a hoisting application, the factor could be as high as 8 or 12 under special conditions. However, additional testing is highly recommended, with final decision and acceptance by the customer.
For applications requiring increased wear resistance and lower friction in a given size cable, particularly push-pull types, swaging provides a good answer. The average diameter decrease by swaging without appreciable loss in performance is approximately 10%. In swaging, the outer wires are flattened to provide greater wear area and a smoother surface. The breaking-strength-to-cable-diameter ratio remains constant, without appreciable loss of flexibility.
Get in touch with one of our wire rope and cable assembly experts today and find out what our customers already know: Sava knows cable.
Contact a cable expert
Our stranding equipment is available for manufacture of cables using your material or material identified in your project's specifications. We have successfully manufactured cables from exotic and sometimes extremely unusual materials, some of which were also plastic coated.
Sava’s modern extrusion equipment and expertise lend well to extruding other plastic materials, such as polypropylene, polyethylene, polyurethane and many types of nylon. Also, Sava is pleased to provide a quote on coating more than one cable in a common jacket. Colored plastic is possible in most plastics as well. Many of the cables are available in black nylon or vinyl coating.
Electric cutting (or electrocutting) of uncoated cable is a process by which the ends of the cable are fused (sealed) to prevent fraying and to allow easy application of a fitting. It is particularly desirable to specify electric cutting, where only one end of an assembly has a fitting. Sava is equipped with automatic, electric cutting machinery and expertise, which is also available to cut your bulk cable to desired lengths. Unless you are similarly equipped to cut your cable in an efficient, mechanized and cost-effective manner, you may find our cutting services particularly advantageous.
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