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The hardness of 60 degrees is enough, and the hole of the concave die is enlarged 0.12 ~ 0.15....

1.5mm thick 304 stainless steel punching 1.5mm round hole, punching needle always broken. Please have successful operating experience of the master to teach, thank you?

The hardness of 60 degrees is enough, and the hole of the concave die is enlarged 0.12 ~ 0.15.