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What material countersink for stainless steel?

For stainless steel, cobalt HSS (HSS-E) is recommended - M42 grade with 8% cobalt is best, combined with AlCrN or TiAlN coating. Stainless causes welding and poor heat dissipation; cobalt HSS resists heat and the coating reduces friction, significantly extending tool life. Lihao Technology's stainless series delivers 3x longer life.

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