Wire Rope Ratings Strength

Nominal strength in kg.

Wire rope ratings strength.

It is recommended not to exceed 1 3 3 1 design factor of the rope s strength to maintain a useful service life. Nominal strength in short tons. Cordage instutitute uses refernece size number which is the approximate circumference of the rope. Nominal strength in pounds.

Efficiency rating depends on rope size and core type. Nominal strength in metric tons. 1 ton 2 000 lbs. The strength of the sling is decreased.

Starlift xtra wire rope has one of the highest strength to diameter ratios on the market. Type of hitch vertical choker or basket. Basket ratings are based on a minimum d d of 25. Recommended safe working load a 5 1 design factor lbs recommended safe working load a 5 1 design factor kg recommended safe working load a 3 5 1 design factor lbs.

M f g 1 where. A fitting having an efficiency rating of 90 may very well develop 100 of the rope s catalogue breaking strength because the rope s actual breaking may very well be 5 15 higher. Asme b30 5 mobile and locomotive cranes requires a design factor of 3 5 for 6 strand hoist ropes. You ll likely see two different ways to measure the breaking strength of wire rope.

Aggregate strength refers to the collective breaking strength of all of the wires in a single cable when a manufacturer tests them individually. F force weigh t n m mass kg g acceleration of gravity 9 81 m s2 maximum safe mass for a 3 8 wire rope where the safe load is 10 9 kn can be calculated as. Dry strength shock load absorption ability. Number of parts of rope in the sling.

Rated capacity is based on nominal wire rope breaking strength. For choker hitch the angle of choke shall be 120 degrees or greater. 1 use only with 6 strand wire rope. Strength breaking tenacity dry grams denier wet strength vs.

Minimum sling length when using standard eyes. Splicing or end attachment efficiency. Minimum breaking strength refers to the smallest load that will pull a piece of wire rope apart. Rated load based on pin diameter no larger than one half the natural eye length or not less than the nominal sling diameter.

M 10 9 103 n 9 81 m s2 1111 kg. And diameter of curvature around which the sling is bent. D d ratio is the ratio of the diameter.