Wire Rope Ratings Strength

1 ton 2 000 lbs.

Wire rope ratings strength.

Aggregate strength refers to the collective breaking strength of all of the wires in a single cable when a manufacturer tests them individually. Basket hitch capacity based on minimum d d ratio of 25 1. Nominal strength in metric tons. 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.

Cordage instutitute uses refernece size number which is the approximate circumference of the rope. It is recommended not to exceed 1 3 3 1 design factor of the rope s strength to maintain a useful service life. The strength of the sling is decreased. Efficiency rating depends on rope size and core type.

Minimum breaking strength refers to the smallest load that will pull a piece of wire rope apart. Strength breaking tenacity dry grams denier wet strength vs. M 10 9 103 n 9 81 m s2 1111 kg. 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. 1 use only with 6 strand wire rope. Wire rope slings wire rope environmental considerations. Minimum sling length when using standard eyes.

Type of hitch vertical choker or basket. Number of parts of rope in the sling. And diameter of curvature around which the sling is bent. Rated load based on pin diameter no larger than one half the natural eye length or not less than the nominal sling diameter.

Rated capacity is based on nominal wire rope breaking strength. For choker hitch the angle of choke shall be 120 degrees or greater. 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.

M f g 1 where. D d ratio is the ratio of the diameter. You ll likely see two different ways to measure the breaking strength of wire rope. Nominal strength in kg.

Nominal strength in pounds. Basket ratings are based on a minimum d d of 25. The same standard requires a design factor of 5 0 for rotation resistant ropes.