Chicago-Latrobe
Chicago-Latrobe 78712 Screw Machine Drill Bit 1/4 in 118°
Carbide screw-machine drill bit with a 118-degree four-facet point and bright finish
- TypeDrill Bits
- 1/4 inch carbide drill bit cuts steel cleanly
- 118 degree four-facet point centres accurately without walking
- Bright uncoated finish resists galling in dry drilling
- Right-hand spiral clears chips efficiently from the hole
- Model 78712 identifies the exact Chicago-Latrobe specification
Chicago-Latrobe 78712 1/4 in Drill Bit
The Chicago-Latrobe 78712 is a carbide screw-machine drill bit with a 1/4 inch diameter and a 118 degree four-facet point. It is designed for right-hand cutting in automated or high-volume drilling operations where a rigid, short-length tool is required. The bright uncoated finish suits general-purpose machining of ferrous and non-ferrous materials.
Carbide construction for sustained cutting
Solid carbide provides high rigidity and wear resistance, allowing the bit to maintain dimensional accuracy during extended production runs. The four-facet point geometry reduces thrust force and improves centring, which helps prevent work hardening and edge breakdown when holes are drilled in rapid succession. Heat generated in continuous use is dissipated through the tool body rather than relying on coolant-through channels.
Verify shank fit and material compatibility
Confirm that your machine spindle or collet accepts a straight-shank carbide tool of this diameter before ordering. The bit is non-coolant-through, so external flood or mist cooling must be available if the workpiece material demands it. Buyers who need coated tools for abrasive alloys or coolant-fed drills for deep-hole applications should select a different specification.
Highlights
- 1/4 inch carbide drill bit cuts steel cleanly
- 118 degree four-facet point centres accurately without walking
- Bright uncoated finish resists galling in dry drilling
- Right-hand spiral clears chips efficiently from the hole
- Model 78712 identifies the exact Chicago-Latrobe specification
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
Does the 118-degree carbide tip generate noticeable heat during long drilling sessions?
The bright uncoated carbide 118-degree point runs cooler than coated bits because there is no coating to trap heat, and the four-facet geometry reduces friction during extended use.
What shank style does the 78712 need to fit my drill?
The 78712 has a straight round shank matching its 0.2500-inch diameter, so it fits any standard three-jaw chuck or collet that accepts 1/4-inch round shanks.
Will this right-hand carbide bit work in my older reversible drill press?
Yes, the right-hand cutting direction is standard for all conventional drill presses, and the straight shank seats securely in vintage chucks without adapters.
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