In nylon and polyester slings, what prevents locking up?

• A. Flexibility
• B. Rigidity
• C. Color
• D. Weight

Answer: (A)

Flexibility matters because it lets nylon and polyester slings bend and conform to the shape of the load and the hardware. When a sling is able to flex, it can wrap smoothly around hooks, rings, and edges and still slide into position as the load settles or shifts. That movement prevents the sling from seizing or binding in place, which is what we mean by locking up. The slight stretch and high give of these synthetic slings also help distribute the load more evenly and reduce sharp bends that can cause binding.

Rigidity would tend to cause the sling to jam around corners or hooks, increasing the chance of lock-up. Color and weight don’t influence this behavior, so they aren’t relevant factors here.