Tool bit having a bimetal tip

A tool bit comprising:

• a first end, a second end, and a longitudinal axis extending between the first end and the second end;
• an insertion end portion adjacent the first end and configured to be connected to a tool, the insertion end being composed of a first material having a first hardness;
• and
• a working end portion adjacent the second end and configured to be inserted into a fastener a first distance measured from the second end, the working end portion including a first segment and a second segment, the second segment being fixed to the first segment at a connection interface and being composed of a second material having a second hardness that is greater than the first hardness by a percentage, the connection interface located a second distance measured from the second end, wherein the first distance is less than the second distance, and
• wherein the second distance is based on a first ratio of a maximum radial dimension at a location along the tool bit to a polar moment at the location, and wherein the first ratio is multiplied by the percentage.

A tool bit comprising:

• a first end, a second end, and a longitudinal axis extending between the first end and the second end;
• an insertion end portion adjacent the first end and configured to be connected to a tool, the insertion end being composed of a first material having a first hardness;
• and
• a working end portion adjacent the second end and configured to be inserted into a fastener a first distance measured from the second end, the working end portion being composed of a second material having a second hardness that is greater than the first hardness by a percentage, the working end including a first segment and a second segment that is fixed to the first segment via welding along a connection interface, thereby creating a heat affect zone,
• wherein the connection interface is at a calculated distance measured from the second end plus a second distance of the heat affect zone.