UNC threadspeedrevJune 5, 2024 « Back to Glossary IndexAbbreviation for Unified National Coarse thread; one of the screw threads used on British cars. See National coarse thread UNF thread Related Articles: Glossary: UNF threadGlossary: Third Port InductionGlossary: ThreadGlossary: SAE Standard Screw Threads« Back to Glossary Index