Overview
ISO 4042 is a coating standard for electroplated coatings applied to threaded fasteners used in industrial, mechanical, and structural applications. It defines coating thickness, corrosion resistance, hydrogen embrittlement considerations, and surface finish requirements to support fastening performance and durability. The standard is commonly referenced together with dimensional, mechanical property, thread tolerance, and inspection standards depending on the application requirements. ISO 4042 is frequently applied to bolts, screws, nuts, washers, studs, and other threaded fastening components. When sourcing fasteners to ISO 4042, additional specifications may include coating type, coating thickness, supplementary treatments, material grade, and certification requirements.