Metric external taper thread DIN 158

According to DIN 158, only the external thread is conical (taper 1:16), the internal thread is cylindrical according to DIN 13. According to the old standard DIN 158, internal and external thread are tapered. Today, the tapered internal thread is still in use according to the old standard. The thread is used on sealing screws, screw-in connectors and lubrication nipples. The flank angle is 60°.