What is the minimum diameter rope required in the construction of a simple litter harness?

• A. 1/4 inch
• B. 3/8 inch
• C. 1/2 inch
• D. 5/8 inch

Answer: (B)

Rope diameter for a simple litter harness is about balancing strength with handling. The harness must safely carry the load of a patient and withstand the forces encountered when lifting or lowering, while still allowing secure knots and smooth passage through hardware. If the rope is too thin, it can fail at the knots or where it contacts hardware, especially under dynamic loading. A 1/4 inch rope would be too weak for these demands. On the other end, a very bulky rope like 5/8 inch is unnecessary for a simple harness and makes tying knots and fitting through fittings more awkward.

A 1/2 inch rope is stronger and can work, but it’s not needed for a basic setup and adds extra bulk. Three-eighths inch hits the right middle ground: enough strength to handle typical rescue loads, while remaining easy to knot, tie, and thread through hardware. That practical balance is why the minimum diameter for a simple litter harness is 3/8 inch.