5/16X4 Cotter Pin Zinc D7500C This 1/2-20 x 1 1/2

This 1/2-20 x 1 1/2 hex head flange non-serrated frame bolt is made of high-strength steel and features a black phosphate finish for corrosion resistance

which stands for Defense Federal Acquisition Regulation Supplement

The nibs help to prevent the screws from splitting the wood

This 10-24 x 3/8 Phillips flat machine screw is fully threaded and made of 18-8 stainless steel with a black oxide finish

5/16X4 Cotter Pin Zinc D7500C This 1/2-20 x 1 1/25 16 x 4 Cotter Pin Zinc This cotter pin is made of zinc plated steel and has a diameter of 5 16 inches and a length of 4 inches. It is used to secure a clevis pin or other type of fastener in place. The cotter pin is inserted through a hole in the clevis pin and then spread apart to prevent the clevis pin from coming out. Cotter pins are a simple and effective way to secure fasteners in place and are often used in automotive, marine, and industrial