Hex Machine Screw Nut UNF 3/8 x 5/8 inch in Zinc Plated Steel - ANSI B18.2.2
Hexagon Machine Screw Nuts (UNF - Unified Fine Pitch) imported from the USA. These nuts generally have smaller internal diameters than the range available in standard hexagon nuts, so fit the smaller gauge sizes for Imperial screws. They also tend to be thinner or lower in height but have a larger outer diameter. These are specifically designed to be used in conjunction with other UNF screws or bolts. Often used in small electrical goods manufacturing, such as computers and hifi systems.