This is a Chicago-Latrobe 55489 Series 190 High-Speed Steel Silver & Deming drill bit featuring a 1-25/64" cutting diameter and a 1/2" reduced straight shank. Built with a black oxide finish and a 118-degree conventional point for general-purpose drilling applications in steel, cast iron, and wood.
We have inspected this item and we do not have the capability to fully test it.
Defects Noted: A small chip/notch is present on the primary cutting lip edge, as shown in the close-up photo. There are also some cosmetic scuffs and scratches throughout the unit. Please refer to the photos for more information.
This unit only includes what is photographed in the listing. Made in USA.
Technical Specs
| Item | Reduced Shank Drill Bit |
| Material - Machining | High Speed Steel |
| Finish - Machining | Black Oxide |
| Measurement System | Fractional Inch |
| Drill Bit Size | 1-25/64 in |
| Decimal Equivalent | 1.3906 |
| Drill Bit Point Angle | 118 ° |
| Drill Bit Point Type | Conventional Point |
| Flute Type | Spiral |
| Number of Flutes | 2 |
| Flute Length | 3-1/8 in |
| Maximum Drilling Depth | 5-9/16 in |
| Cutting Direction | Right Hand |
| Spiral Direction | Right Hand |
| Helix Angle | 28° |
| Overall Length | 6 in |
| Depth:Dia. Ratio | 4xD |
| Shank Type - Machining | Straight |
| Shank Dia. | 1/2 in |
| Shank Length | 2-1/4 in |
| Silver & Deming Drill | Yes |
| Standards | Not Rated |
| Coolant Fed | Non-Coolant Through |
| Drill Diameter Tolerance | +0.0000 in /-0.0015 in |
| Material Grade - Machining | General Purpose |
| Primary Material Application | Cast Iron; Steel; Wood |
| Primary Material Application ISO Code | K; O; P |
| Country of Origin | USA |