UNC 1/4" Nut (Full nut) Zinc Plated Unified coarse (UNC) hexagon / full nut made from high tensile steel finished in a bright zinc passivation for mild corrosion resistance. UNC Nut Specifications: Threads per Inch: 20 Diameter (D): 1/4" UNC Spanner Size (A): 7/16" SOLD EACH