SWEBOLT & BOTNIA BOLT supply UNC (Unified Coarse Thread) hex bolts in steel grades 8.8 and 10.9, according to ANSI B18.2.1. Available in plain, zinc-plated (ZN) and hot-dip galvanized (HDG) finishes. UNC threads are commonly used in imported machinery, industrial equipment, and assemblies requiring inch-thread fasteners and reliable strength.