The diamond pattern of this kind of copper nut is located in the middle of the product. The diamond pattern of the diamond pattern of the copper nut is rolled out along the large outer step surface of the product.

Knurled copper nuts are mainly used for injection moulding, metal springs, special-shaped springs, craft gift springs, battery springs, spring antennas, key rings, phosphor-copper springs CNC automatic lathe turning parts (copper parts, iron parts, aluminum parts), metal stamping parts, electronic hardware parts, iron axles, single axles, multi-axles, iron pins, non-standard. Screw nuts, connectors, fasteners, wire forming (metal wire business card clip, model aircraft landing gear, S hook, R-type bolt, triangle buckle, D-type buckle) and other hardware products, belonging to the copper nut series.