Chicago-Latrobe
Chicago-Latrobe 46794 cobalt drill bit 135° split point .3970
Cobalt jobber drill bit with 135° split point for hard metals, size .3970 letter X
- TypeDrill Bits
- MaterialHAWA
- Cobalt construction resists heat during heavy drilling
- 135° split point starts cleanly without wandering
- Jobber length reaches deep holes efficiently
- Straw bronze finish identifies cobalt grade instantly
- Decimal size .3970 matches precise letter gauge
Chicago-Latrobe 46794 Cobalt Drill Bit
The Chicago-Latrobe 46794 is a jobber-length drill bit made from cobalt steel for drilling hard metals. It suits maintenance technicians and machinists who need a reliable bit for stainless steel and high-strength alloys. The 135-degree split point starts on contact to reduce walking on tough surfaces.
135-Degree Split Point and Cobalt Construction
Cobalt material retains hardness at high temperatures generated during heavy-duty drilling. The split point design centres the bit without a centre punch, saving setup time on the job. A straw bronze surface finish identifies the cobalt grade and provides lubricity during cutting operations.
Upgrading From General-Purpose High-Speed Steel Bits
This bit replaces standard high-speed steel drills that dull quickly in abrasive or work-hardening materials. The step up is justified when drilling stainless steel, titanium or tool steel where heat resistance extends tool life. It is not suited for wood, plastics or soft aluminium where standard bits perform adequately.
Highlights
- Cobalt construction resists heat during heavy drilling
- 135° split point starts cleanly without wandering
- Jobber length reaches deep holes efficiently
- Straw bronze finish identifies cobalt grade instantly
- Decimal size .3970 matches precise letter gauge
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
What does the 135-degree split point do for drilling?
The 135-degree split point reduces walking and starts holes accurately on hard materials without a centre punch.
What shank size does the .3970-inch bit need to fit my drill chuck?
The jobber-length bit has a straight shank matching its .3970-inch diameter, so a 3/8-inch or larger chuck is required.
How do I avoid snapping the cobalt bit when I start the hole?
Apply steady pressure at low RPM with cutting fluid; do not force the split point or it can chip on breakthrough.
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