Tap size Basic major; dia (mm) Basic major dia; (inch) mm per thread Drill size; (mm) M1.6 x 0.35 1,6mm.0630.35 1,25mm M2 x 0.4 2mm.0787.4 1,6mm M2.5 x 0.45 2,5mm.0984.45 2,05mm
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