Wire Rope Ratings Strength

Strength breaking tenacity dry grams denier wet strength vs.

Wire rope ratings strength.

M f g 1 where. 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. Basket ratings are based on a minimum d d of 25. Asme b30 5 mobile and locomotive cranes requires a design factor of 3 5 for 6 strand hoist ropes.

The same standard requires a design factor of 5 0 for rotation resistant ropes. Rated capacity is based on nominal wire rope breaking strength. Wire rope slings wire rope environmental considerations. Nominal strength in metric tons.

1 use only with 6 strand wire rope. Cordage instutitute uses refernece size number which is the approximate circumference of the rope. Splicing or end attachment efficiency. 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. And diameter of curvature around which the sling is bent. Nominal strength in short tons.

Aggregate strength refers to the collective breaking strength of all of the wires in a single cable when a manufacturer tests them individually. Nominal strength in pounds. 1 ton 2 000 lbs. Basket hitch capacity based on minimum d d ratio of 25 1.

Minimum breaking strength refers to the smallest load that will pull a piece of wire rope apart. M 10 9 103 n 9 81 m s2 1111 kg. Nominal strength in kg. Starlift xtra wire rope has one of the highest strength to diameter ratios on the market.

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. Rated load based on pin diameter no larger than one half the natural eye length or not less than the nominal sling diameter. Efficiency rating depends on rope size and core type. Type of hitch vertical choker or basket.

For choker hitch the angle of choke shall be 120 degrees or greater. The strength of the sling is decreased. D d ratio is the ratio of the diameter.