Hex socket cap screw according to ANSI B18.3 standard with UNC (Unified National Coarse) thread, strength class 8.8, zinc plated (ZN) surface. The design corresponds closely to ISO 4762 with a cylindrical head but uses inch threads. The zinc-plated finish provides basic corrosion protection suitable for dry or indoor use. Commonly used in machinery, equipment, and imported constructions where UNC threads are standard. Available in multiple lengths and dimensions from SWEBOLT & BOTNIA BOLT.