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UNF (Unified Fine) is the same as UNC except that for each size of bolt, the number of threads per inch is higher, so the thread is finer. UNEF (Unified Extra Fine) is the same as UNF except that the number of threads per inch is even higher for each fastener size. UNF and UNEF fasteners are generally available only from industrial fastener suppliers. 4UN, 6UN, 8UN, 12UN, 16UN, 20UN, 28UN, and 32UN are thread series in which the number before the UN indicates the number of threads per inch.