Wire rope slings wire rope environmental considerations.
Wire rope ratings strength.
Basket ratings are based on a minimum d d of 25.
D d ratio is the ratio of the diameter.
Nominal strength in short tons.
Number of parts of rope in the sling.
The strength of the sling is decreased.
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.
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.
Dry strength shock load absorption ability.
Splicing or end attachment efficiency.
Nominal strength in pounds.
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.
Nominal strength in metric tons.
M 10 9 103 n 9 81 m s2 1111 kg.
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.
1 use only with 6 strand wire rope.
Rated capacity is based on nominal wire rope breaking strength.
Type of hitch vertical choker or basket.
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.
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.
And diameter of curvature around which the sling is bent.
The same standard requires a design factor of 5 0 for rotation resistant ropes.
You ll likely see two different ways to measure the breaking strength of wire rope.
Minimum sling length when using standard eyes.
1 ton 2 000 lbs.
M f g 1 where.
Minimum breaking strength refers to the smallest load that will pull a piece of wire rope apart.
Nominal strength in kg.
Basket hitch capacity based on minimum d d ratio of 25 1.
