Mooring cleats are mounted on docks and boats and are used to secure a boat by wrapping a line around the cleat several times, often in a figure 8 pattern. Cleats are often used in conjunction with chocks in tethering a boat.
Generally, manufacturers recommend just slightly under one inch of cleat for every 1/16-inch of line diameter , which means you need a six-inch cleat for 3/8-inch line, an eight-inch cleat for 1/2-inch line, and a 10-inch cleat for 5/8-inch line.
Full dimensions are on my website – Mooring Cleats
Fig 3 shows different sized cleats and what they would measure in various scales
At the bottom of the page are links to all of the current cleats on Shapeways.
Dimensions 3.5 mm Mooring Cleat
- Click chart for larger image