The correct selection of steel wire rope decides the lifetime and whether it has deformation, clasp, and unexpected loss of function. 
So the selection rule is as below:
1. When lift heavy goods with no direction guide or lift to a very high level, Please select non-rotating steel wire rope.
2. When lift heavy goods with direction guide or lift several times to a low height, or use left winding and right winding rope together, normal steel wire rope can be selected. There is rules regards the twist direction of steel wire rope selection: left twist rope is recommended when the drum slot is winding in right direction, on the contrary, use right twist rope when the drum slot is winding in the left direction.
3. As for the single layer wrapping steel wire rope, above rules must be followed strictly. Otherwise, it may cause the steel wire rope’s permanently deformation.  For the multi-layer wrapping steel wire rope, the twist direction is decided by drum slot direction, this will be good for next layer wrapping. 
4. For multi-layer wrapping steel wire rope, the friction and squeeze force is big, the rope will be disordered. So we need to select steel wire rope with smaller diameter than the slot diameter, in order to increase the contact area of rope and drum, reduce the friction between the beneath ropes, then elongate the rope life time. The practice has proved that, when the diameter of steel wire rope is 1% smaller than drum slot, it will be helpful to rank the ropes neatly, avoid rope disorder.
5. If the diameters are the same, more are the numbers of ropes string, the thinner of single steel wire string is. This kind of steel wire rope has good flexibility, to eliminate the opposite force when the steel wire rope goes in and out of drum, and it easy for the rope to penetrate. While, for the thicker rope, the string is also thick, it has good anti-abrasion, anti mechanical damage, anti-corrosion & anti squeezing force. So when the two advantages are combined, it can be called the best quality steel wire rope with high performance.
6. Besides, we should pay attention that the minimum diameter and minimum brake tension force should be accordance with ISO4308.