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UNC stands for "UNIFIED BOLT THREAD COARSE"
UNF stands for " UNIFIED BOLT THREAD FINE"
UNC= American Standard (unified course thread)It is a bolt that has 13 threads per inch. which would be a 1/2 in in diameter bolt which has a unc of 13Titan, Superior Bolting Solutions
Unified National Fine as opposed to UNC - Unified National Course
Wirld wide unified fine
University of North Carolina Unified National Coarse (Thread forming)