Yes, in addition to standard production in HSS, we can supply sintered + coated tools suitable for broaching very hard materials (max. 28/30 HRC).

For hexagons, pre-drilling 5% more than the inscribed diameter is recommended. Example: Hexagon 10 - pre-drill 10,5.
For squares, 10% more is recommended.

Certainly yes. As the cutting edge wears down (rounding off), the machining effort increases considerably, making it easier to break the tool.