General Information

Standard Nylon & Polyester Slings

Every Lift Uses 1 of 3 Basic Hitches

All Hercules SLR slings are marked to show Working Load Limit (WLL) in vertical, choker and basket hitch. All slings have the largest load capacity when used in the basket hitch. Capacity in the vertical hitch is 50% of that in the basket hitch. Capacity in the choker hitch of single leg slings shall be a maximum of 80% of the vertical rated load.

Effect of Angle Increases
Sling angle is the angle measured between a horizontal line and the sling leg or body. The angle is very important and can have a dramatic effect on the rated capacity of the sling - when this angle decreases, the load on each leg increases. This principle applies whether in a basket hitch or for multi-legged bridle slings. When possible, the sling angle should be more than 45o. At any sling angle under 30o a spreader beam should be used. To determine the slings reduced rating according to a specific sling angle, you should multiply the sling rating by the appropriate loss factor.


  • Assume sling capacity is 2 000 lbs in vertical hitch and 4 000 lbs. in a 90o basket hitch
  • If the sling angle is 50o, then the loss factor is 0.766
  • Multiply 4 000 lbs. x 0.766 = 3 100 lbs
  • 3,100 lbs. is the rated capacity in the basket hitch at a sling angle of 50 o
  • Design factor - All working load limits are based on a factor of 5 : 1

Length of Web Sling

Always measure slings pull to pull when flat as shown. Approximate stretch at rated sling capacity is 10% for nylon and 5% for polyester. Hercules SLR manufactures slings to a tolerance of ± 2% for one and two ply slings and ± 4% for three and four ply slings. Please specify when ordering if you require matched pairs of slings.