HRC65 Internal Thread Milling: Tool Selection and Machining Strategies
Last winter, a long-standing client in Stuttgart reached out with an urgent problem. They needed to add four M6 internal threaded holes to a D2 stamping die insert. The block was already vacuum-hardened to HRC64–65. The operator tried to tap the holes with a standard carbide tap, but it snapped after engaging just two threads.
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