Reducing Tap Breakage in Stainless Steel Machining: Technical Approach with DIN371 Spiral Flute Taps

In German manufacturing, stainless steel is widely used due to its corrosion resistance and strength. However, it also presents challenges in machining, especially during blind hole tapping, where tap breakage is a common issue.

Stainless steel generates high cutting resistance and has low thermal conductivity, leading to localized heat buildup. Additionally, chips tend to adhere to the cutting edge, increasing load if not evacuated properly.

From a technical perspective, concentrated or fluctuating cutting loads increase local stress on the tap, raising the risk of breakage, particularly in continuous production.

DIN371 spiral flute taps address this through optimized geometry. The spiral flute design directs chips upward, reducing interference, while the short thread design minimizes cutting engagement length and load concentration.

Key parameters include thread lengths of 6–15 mm, overall lengths of 56–100 mm, and high-speed steel materials such as M42 and M35 for wear and heat resistance.