Chicago-Latrobe
Chicago-Latrobe 77657 118° Carbide Jobber Drill 5/16 in .3125
Carbide-tipped jobber drill with a 118-degree point for 5/16-inch holes
- TypeDrill Bits
- MaterialHAWA
- Carbide tip extends tool life in hard materials
- 118-degree point starts accurately without walking
- Jobber length suits general-purpose drilling tasks
- 5/16 inch size matches common fastener holes
- Bright finish resists corrosion during storage
Chicago-Latrobe 77657 Jobber Drill
The Chicago-Latrobe 77657 is a jobber-length drill bit sized at 5/16 in with a decimal equivalent of .3125. It is built for machinists and maintenance technicians who need a reliable fractional-inch drill for general-purpose holemaking in a variety of materials.
118° Conventional Point Geometry
The 118-degree conventional point angle provides effective centering and chip evacuation in standard drilling operations. A bright, uncoated finish keeps the cutting edges sharp for easy resharpening, while the non-coolant-through design suits both hand-held and machine use without requiring through-spindle coolant delivery.
Carbide-Tipped HAWA Construction
Carbide tips brazed to a HAWA body deliver the hardness needed for abrasive or tough materials while the steel shank absorbs shock. The bundle contains only the drill bit itself, so operators must supply their own tool holders, coolant systems or lubricants to match the specific application.
Highlights
- Carbide tip extends tool life in hard materials
- 118-degree point starts accurately without walking
- Jobber length suits general-purpose drilling tasks
- 5/16 inch size matches common fastener holes
- Bright finish resists corrosion during storage
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
What does the 118 degree point angle on the 77657 drill bit determine in practice?
The 118 degree point angle on this carbide tipped jobber drill is a conventional geometry suited for general purpose drilling in a variety of materials.
What shank size does the 5/16 inch 77657 drill bit have for fitting into a chuck?
The 5/16 inch diameter .3125 decimal equivalent jobber drill has a straight shank matching the drill diameter for standard chuck mounting.
How is the carbide tipped 77657 drill bit installed and what step is often missed?
Secure the bright uncoated jobber drill in a drill chuck tightened evenly on the straight shank; the step often missed is verifying the bit runs true before drilling.
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