Single-sided threading insert, triangular with an inscribed circle diameter of 0.3750 in, for right hand cutting of ISO-metric external threads with 1.25 in pitch, T8030 PVD coated fine grained WC-Co carbide within ISO-grade ranges P25-P40/M20-M35 and K20-K40 for machining of steel, stainless-steel and cast-iron.