Hex socket cap screw according to ANSI B18.3 standard with UNF (Unified National Fine) thread, strength class 8.8, zinc plated (ZN) surface. The design corresponds to ISO 4762 but uses a fine inch thread, providing improved tightening control, greater thread contact, and better vibration resistance. The zinc-plated surface provides basic corrosion protection suitable for dry or indoor use. Used in machinery, equipment, and imported constructions where UNF threads are standard. Available in multiple lengths and dimensions from SWEBOLT & BOTNIA BOLT.