What size should your boat lines be during a storm?
- Primary Mooring Lines – Check size, condition, and length.
- Spring Lines – Check size, condition, and length.
- Check vessel cleat size to be sure primary/spring lines will fit on one cleat.
- Chafe gear – use clear vinyl, water hose, or leather (punch a hole at each end of the hose to secure it to the line with a smaller line to avoid sliding).
MINIMUM MOORING LINE STANDARD
Yacht Size Primary Line Size Spring Line Size
(overall length) (diameter) (diameter)
Up to 23 ft 3/8” 3/8”
24 ft to 32 ft ½” ½”
33 ft to 42 ft 5/8” ½”
43 ft to 51 ft ¾” ¾”
Over 51 ft 1” 1”
Use only 3-strand twisted or braided nylon (no polypropylene or manila). Chafe gear – water hose, clear vinyl tubing, sewn on leather (tape is not effective).
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