Tool bit
A tool bit includes a hexagonal drive portion, a working end, and a shank interconnecting the drive portion and the working end. The shank includes an outer peripheral surface having a curvature in a plane including a central axis of the tool bit. The outer peripheral surface having the curvature includes a length in the direction of the central axis. A ratio of the length of the outer peripheral surface having the curvature to the length of the tool bit is between about 0.2:1 and about 0.7:1.
1. A tool bit comprising:
a hexagonal drive portion;
a working end; and
a shank interconnecting the drive portion and the working end, wherein the shank includes an outer peripheral surface having a curvature in a plane including a central axis of the tool bit, wherein the outer peripheral surface having the curvature includes a length in the direction of the central axis, and wherein a ratio of the length of the outer peripheral surface having the curvature to the length of the tool bit is between about 0.2:1 and about 0.7:1, wherein the shank is polished along the entire length of the outer peripheral surface having the curvature, and wherein the hexagonal drive portion and the working end each include a corrosion-resistant coating.
2. The tool bit of claim 1 , wherein the ratio of the length of the outer peripheral surface to the length of the tool bit is between about 0.3:1 and about 0.4:1.
3. The tool bit of claim 1 , wherein the ratio of the length of the outer peripheral surface to the length of the tool bit is between about 0.2:1 and about 0.3:1.
4. The tool bit of claim 1 , wherein the curvature is defined by a radius, and wherein a ratio of the radius of the curvature of the outer peripheral surface of the shank to the length of the tool bit is between about 0.50:1 and about 14.3:1.
5. The tool bit of claim 4 , wherein the ratio of the radius of the curvature of the outer peripheral surface of the shank to the length of the tool bit is between about 1.25:1 and about 1.75:1.
6. The tool bit of claim 4 , wherein the ratio of the radius of the curvature of the outer peripheral surface of the shank to the length of the tool bit is between about 0.50:1 and about 1:1.
7. The tool bit of claim 1 , wherein the outer peripheral surface having curvature defines a maximum diameter of the shank and a minimum diameter of the shank, and wherein a ratio of the minimum diameter to the maximum diameter is between about 0.7:1 and about 0.95:1.
8. The tool bit of claim 1 , wherein the curvature is defined by a radius between about 3 inches and about 50 inches.
9. The tool bit of claim 1 , wherein the curvature is defined by a radius between about 1 inch and about 2 inches.
10. The tool bit of claim 1 , wherein the shank is polished to a surface finish of at least about 2 microns.
11. The tool bit of claim 1 , wherein the tool bit includes a hardness between about 52 HRC and about 60 HRC.
12. The tool bit of claim 1 , wherein the shank is polished to a surface finish between about 1 micron and 2 microns.