Buy an extra fin screw and plate to keep around in case you drop one into the sand or lose it in your garage or car’s trunk. Stuff happens!
Note: One fin screw and plate is included in every WG2 order–but you might want an extra to prevent down time if you lose the original.
Screw: Phillips head, stainless steel, 6-32 x 3/4″
Threaded plate: Stainless steel, 1/2″ x 5/8″
Fits standard US fins fin boxes.
Note about screw size:
The screw we use is smaller than usual—a number 6 screw—but still plenty strong—more than 2,000 pounds of break strength. We went to a smaller screw in order to make a smaller hole in the fin, and thus a stronger fin. Loads concentrate at the hole, as shown by the yellow spots in the finite element analysis (FEA) shown below. Adding more fin mass, i.e. making the hole and the screw smaller makes the fin stronger. Our screw will fit into bigger holes—most companies use a bigger number-8 screw in a bigger hole. So if you need and extra for FSI’s WG2 or other fins, this will work.