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Uns① Special series of unified threads unr Unified threads of constant pitch series with arc base. Unr, unrc, unrf, unref, unrs with arc base are only used for external threads and no internal threads. unrc Unified threads with coarse pitch series with arc base.
Un, unf, unc; are the identification of inch-based unified threads. Un is the abbreviation of unified national, which belongs to the constant pitch series of unified threads. unf is the abbreviation of unified national fine in English, which is a unified thread fine tooth series. unc is English unified.
