iron fin headed bolts?

[Thad Van Gilder]

So I am replacing a mast step for a guy on a Nevins built, 1925 Rhodes 25 footer. Upon removing the sucker, I started removing the fin head 5/16 inch bolts that run athwartships through it. Although some were bronze, a couple appeared to be iron...

Have any of you ever heard of this? I thought all fin headed bolts were bronze.

-Thad

[Dale Genther]

We had a bunch of them on Boreal. She was built in Argentina. I had assumed they were somehow fabricated by the builder in 1952.

[Jay Greer]

I have seen galvanized iron fin headed bolts used in several boats.
Personaly I have always made them out of bronze. There are many on line sources. Just search for "fin headed bolts".
Jay

[Thad Van Gilder]

Boyles, Finned bolts or fin headed bolts are used like carriage bolts.
To my knowledge they are boat specific.

-Thad

[kc8pql]

These are fin head bolts. As you can see, they look nothing like carriage bolts, although their use is similar.
http://www.appleinternationalenggworks.com/fasteners-and-fixtures/silicon-bronze-fasteners/silicon-bronze-bolts/silicon-bronze-fin-neck-flat-head-machine-bolts/silicon-bronze-fin-neck-flat-head-machine-bolts.jpg

[Canoeyawl]

Plow bolts have a square section under the head,
Fin heads have, well, a Fin