Metallics Cap screw of dimension 3-Inch x 3/8-Inch Dia, has UNC 3/8-16 thread and is suitable for use in electrical, plumbing, heating and air conditioning industries. It features steel construction and zinc-chromate finish. This Grade 2 screw has hex head of size 0.562 - 0.551-Inch x 0.226 - 0.243-Inch.