Method of heat treating a fastening member

A fastening member comprising:

• a head portion having an outside head surface and an inside head surface;
• and
• a body portion attached to the head portion, wherein the body portion includes:
• a shank portion extending from the head portion, wherein the head portion and the shank portion are tempered to a hardness value between 48 Rockwell C and 60 Rockwell C;
• and
• a thread portion having a plurality of threads, wherein the thread portion is induction tempered to a hardness value between 25 Rockwell C and 44 Rockwell C;
• the shank portion originating at the inside head surface and terminating at the thread portion, and being unthreaded along a full shank portion length extending from the inside head surface to the thread portion;
• and
• the thread portion originating at the shank portion and terminating at a fastening member terminal tip, and the plurality of threads are hardened to the hardness value between 25 Rockwell C and 44 Rockwell C along a full thread portion length extending from the shank portion to the fastening member terminal tip.