Cordage instutitute uses refernece size number which is the approximate circumference of the rope.
Wire rope ratings strength.
M 10 9 103 n 9 81 m s2 1111 kg.
Nominal strength in pounds.
Aggregate strength refers to the collective breaking strength of all of the wires in a single cable when a manufacturer tests them individually.
For choker hitch the angle of choke shall be 120 degrees or greater.
Starlift xtra wire rope has one of the highest strength to diameter ratios on the market.
The same standard requires a design factor of 5 0 for rotation resistant ropes.
It is recommended not to exceed 1 3 3 1 design factor of the rope s strength to maintain a useful service life.
Splicing or end attachment efficiency.
Type of hitch vertical choker or basket.
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.
1 ton 2 000 lbs.
M f g 1 where.
Basket hitch capacity based on minimum d d ratio of 25 1.
Dry strength shock load absorption ability.
Efficiency rating depends on rope size and core type.
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.
You ll likely see two different ways to measure the breaking strength of wire rope.
Basket ratings are based on a minimum d d of 25.
Rated capacity is based on nominal wire rope breaking strength.
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.
Nominal strength in kg.
Strength breaking tenacity dry grams denier wet strength vs.
Minimum sling length when using standard eyes.
D d ratio is the ratio of the diameter.
Number of parts of rope in the sling.
And diameter of curvature around which the sling is bent.
Asme b30 5 mobile and locomotive cranes requires a design factor of 3 5 for 6 strand hoist ropes.
Nominal strength in metric tons.
1 use only with 6 strand wire rope.
Nominal strength in short tons.
