
Frank Marine
When one end meets a flat tang or a chain link and the other meets a rope or shackle. The jaw pins directly onto the flat fitting, which keeps the assembly short and stops the extra shackle that would otherwise let things twist. Common on anchor rodes and lifelines.
Yes, if it is going somewhere you cannot watch. Vibration and a working rode will back a pin out over a season. Mouse it with stainless seizing wire or a split pin, and check it whenever you inspect the rest of the rig rather than once a decade.
Salt drying inside the barrel, usually. The bearing surfaces are hidden, so a swivel can look spotless and still be wearing itself away. Rinse it under fresh water, work it through its turns while wet, then dry it and give it a light oil before it goes back on.

Frank Marine

Frank Marine

Frank Marine

Frank Marine

Frank Marine

Frank Marine
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