Selection and Ordering ​Wire Rope

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​Selection and Ordering


Safe Working Load

 To determine the safe working load of a wire rope, the nominal strength or Minimum Breaking Load (MBL) must be reduced by a design or safety factor.

 The MBS of a wire rope should be considered the straight line pull which will actually break the wire, and is in kilograms of force (kgf).

 The nominal strength or MBL of a wire rope should never be used as its working load.

 The safety factor is the ratio of strength of the rope or strand to the working load required. It is impossible to establish a uniform safety factor as it will depend upon the type of work performed, government regulations, loads applied, speed of operation, length of wire rope used etc.

 Limit tension is used as the standard maximum tensile load of a cable member on an architectural tensile assembly.

 It is the customer’s responsibility to ensure that an appropriate safety factor has been applied to the MBL to calculate the safe working load of the wire rope being ordered.  Strudyna can assist with information on this process but takes no responsibility for the final decision made in ordering the wire.

 NOTE: Never “shock load” a wire rope. A sudden application of force or load can cause both visible external damage and internal damage. There is no practical way of calculating the force applied by shock loading a rope. If it is suspected a wire rope has been shock loaded it should be replaced immediately.

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Kilogram-force (kgf) Definition

 A kilogram-force (kgf) is a unit of force equal to the magnitude of that exerted on one kilogram of mass by a 9.80665 m/s2 gravitational field (standard gravity, a conventional value approximating the average magnitude of gravity on Earth).

 So one kilogram-force is by definition equal to 9.80665 newtons. Similarly a gram-force is 9.80665 millinewtons (or 0.00980665 newtons), and a milligram-force is 9.80665 micronewtons (or 9.80665×10−6 newton)

Ordering of Wire Rope

 To avoid errors it is necessary, when asking for quotations or placing orders, that the required wire rope be accurately specified. The best procedure is to quote the Strudyna code listed in this

Catalogue/Price List or on a previous invoice.

 If you are unable to provide Strudyna code, the following information will be required:

                1. Type of Wire

                2. Construction

                3. Grade or Tensile Strength

                4. Size/Diameter

                5. Length Required

                6. Usage/Industry

                7. Safe Working Load (if necessary)

Strudyna staff are always eager to help our customers ensure they select, and we supply, the correct product for the application required. If what you are looking for is not in this Catalogue/Price List please ask and we will be sure to use our 50 years of knowledge and experience to help you find it.

 All orders placed with Strudyna are to conform with our Terms & Conditions listed at the back of this catalogue.



Steel wire ropes must be serviced regularly, the kind of maintenance depending on its use and the selected rope. Regular maintenance may considerably increase the service life of a steel wire rope.

 To prevent crevice corrosion, stainless steel wire rope and strand in particular should be cleaned regularly with a soft cloth using soap or mild detergent and warm water, followed by rinsing with cold water and wiping the surface dry. If done regularly, this will remove the majority of contaminants that accumulate in the crevices between the strands.

For the marine industry, it is recommended that rigging be replaced every ten (10) years at a minimum due to the fatigue placed on the wire rope and the current policies of the insurance industry in relation to this.

Upon inspection, if you believe a wire rope is damaged, it should not be used until inspected by a professional.

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