UNC Carbon Steel Taps 1st 2nd 3rd Set UNC carbon steel taps available individually or as a full 1st, 2nd and 3rd tap set. These UK made hand taps are suitable for Unified National Coarse threads and are mainly used for cleaning, chasing and repairing existing internal threads. Choose from a... £2.52 (Inc. VAT) £2.10 (Ex. VAT) Choose Options Compare