Reducing High Torque Risk in Thick Steel Plate Tapping: Selection of Metric Straight Flute Taps

In Russian steel structure and heavy engineering industries, thick plate machining is a common application, especially in bridges, energy equipment, and large structural components. In such conditions, high tapping torque is a key challenge affecting process stability.

In practice, thick materials increase cutting engagement length, leading to continuous accumulation of cutting load. As tapping depth increases, torque requirements rise significantly. If chip evacuation is insufficient, resistance increases further, causing instability or tool failure.

From a machining perspective, excessive torque is mainly caused by accumulated cutting load. When chips are not effectively removed, cutting resistance increases continuously, destabilizing the process.

DIN376 straight flute taps help reduce this risk. The straight flute geometry supports stable chip evacuation in through-hole applications, while the plug chamfer enables progressive cutting engagement, distributing the load more evenly.

Key parameters include thread lengths of 8–50 mm for thick materials, overall lengths of 40–180 mm for rigidity, and a size range from M12 to M33. The 6H tolerance ensures consistent thread quality.