Wire Rope Ratings Strength

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.

Wire rope ratings strength. Basket hitch capacity based on minimum d d ratio of 25 1. Nominal strength in kg. It is recommended not to exceed 1 3 3 1 design factor of the rope s strength to maintain a useful service life. 1 ton 2 000 lbs.

The same standard requires a design factor of 5 0 for rotation resistant ropes. Number of parts of rope in the sling. Aggregate strength refers to the collective breaking strength of all of the wires in a single cable when a manufacturer tests them individually. Rated capacity is based on nominal wire rope breaking strength.

Wire rope slings wire rope environmental considerations. Strength breaking tenacity dry grams denier wet strength vs. Type of hitch vertical choker or basket. 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. 1 use only with 6 strand wire rope. M 10 9 103 n 9 81 m s2 1111 kg. Nominal strength in pounds.

Cordage instutitute uses refernece size number which is the approximate circumference of the rope. Basket ratings are based on a minimum d d of 25. Efficiency rating depends on rope size and core type. Asme b30 5 mobile and locomotive cranes requires a design factor of 3 5 for 6 strand hoist ropes.

For choker hitch the angle of choke shall be 120 degrees or greater. 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. The strength of the sling is decreased. Splicing or end attachment efficiency.

D d ratio is the ratio of the diameter. You ll likely see two different ways to measure the breaking strength of wire rope. Starlift xtra wire rope has one of the highest strength to diameter ratios on the market. Dry strength shock load absorption ability.

Minimum breaking strength refers to the smallest load that will pull a piece of wire rope apart. Minimum sling length when using standard eyes. Nominal strength in short tons.