US Box Screw M4 x 20 with Square Nut

The Unifiber mounting set for US Box fins includes an M4 screw with a length of 20 mm and a brass plate nut. It is a practical replacement part if the original mounting hardware is lost or damaged, and also useful as a spare to take on a trip. The nut is placed in the US Box track, where it works with the screw passing through the fin mounting hole. The set allows the fin to be secured in the selected position inside the box. Choosing the correct fit Before purchasing, check the required screw length and make sure the plate fits the track in the fin box. Compare the dimensions with the existing mounting hardware or with the recommendations of the board and fin manufacturer.