Hex socket cap screws according to ANSI B18.3 standard with UNC and UNF inch threads in stainless steel A2 and A4. The design corresponds closely to ISO 4762 but uses imperial thread systems instead of metric. A2 (AISI 304) provides good corrosion resistance for general use, while A4 (AISI 316 / A4-80) offers enhanced resistance in wet or chemically exposed environments. Commonly used in imported machinery, process equipment, and constructions based on inch threads. Available in multiple dimensions and lengths from SWEBOLT & BOTNIA BOLT.