4-40X3/16X1/16 Small Pattern Hex Machine Screw Nut Black Zinc (Pack Qty 10,000) BC-0403NHBZ

Designed to be used with machine screws in areas where there is limited space for wrenching. Stainless nuts are used with stainless machine screws where parts are subject to corrosive conditions. Steel: Any low carbon steel. Stainless: 18-8 stainless steel