Overview
ASME B18.3 is a dimensional standard covering socket cap screws and related fastening hardware used in industrial, mechanical, and equipment assembly applications. It defines dimensional characteristics, drive configurations, tolerances, and thread requirements to support secure fastening performance. The standard is commonly referenced together with material, mechanical property, coating, and inspection standards depending on the application requirements. ASME B18.3 hardware is commonly manufactured from alloy steel, stainless steel, and corrosion-resistant material options. When sourcing products to ASME B18.3, additional specifications may include drive style, thread requirements, material grade, finish or coating, and certification requirements.