The choice of knife depends on the hardness and tensile strength of the specimen material. For most standard applications, where specimen hardness does not exceed HRC 42, an M42 broacher knife is the ideal choice. This tool steel offers excellent wear resistance and maintains sharpness through repeated use, ensuring precise and smooth notch formation.

When working with materials that exceed 600 MPa in tensile strength or have higher hardness values, a customized knife configuration is recommended. In such cases, NextGen’s engineering team analyzes the provided specimen samples to design a broacher knife with the appropriate material composition, geometry, and cutting angle.

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