[請益] 請問一般黑色內六角螺絲硬度
如題，請問各位前輩一般在用M4~M10左右的，黑色內六角螺絲，
硬度大約是多少?或者知道是什麼材料做成的，
其硬度會比不鏽鋼硬麼?
另外想請教一下，熱處理後的高碳鋼，硬度會比不鏽鋼硬麼?
盼有經驗的前輩給予指點，
麻煩了，感謝。
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