Chicago-Latrobe
Chicago-Latrobe 54066 135 Degree Cobalt Jobber Drill Bit
Cobalt jobber drill bit with a 135-degree split point for accurate drilling in hard metals
- TypeDrill Bits
- MaterialHAWA
- 135-degree split point starts on contact without wandering
- Cobalt construction resists heat during heavy-duty drilling
- TiN coating reduces friction for longer bit life
- Jobber length handles standard-depth holes in metal
- 3/8 inch diameter matches common fastener sizes
135° Cobalt Jobber Drill Bit
The Chicago-Latrobe 54066 is a heavy-duty jobber-length drill bit made from cobalt steel with a TiN coating. Its 135-degree split point reduces walking and starts holes cleanly in hard materials. The fractional 3/8-inch size suits general workshop and automotive tasks.
Split Point and TiN Coating
The split-point geometry centres the bit without a centre punch, saving time on repetitive drilling. TiN coating lowers friction and heat, extending edge life when cutting stainless steel or other tough alloys. No coolant holes are present, so external lubrication is recommended for deep holes.
3/8-Inch Fractional Size
This bit measures exactly .3750 inches in diameter, matching standard 3/8-inch fractional specifications. Buyers needing metric diameters or larger fractional sizes will need a different bit. The jobber length provides standard reach for most bench and handheld drilling operations.
Highlights
- 135-degree split point starts on contact without wandering
- Cobalt construction resists heat during heavy-duty drilling
- TiN coating reduces friction for longer bit life
- Jobber length handles standard-depth holes in metal
- 3/8 inch diameter matches common fastener sizes
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How often will the 135-degree split point need resharpening when drilling hard metals?
The cobalt construction and TiN coating resist wear longer than standard high-speed steel, so resharpening intervals are extended under typical jobber-length use.
What limits continuous drilling before the bit overheats?
The 135-degree split point reduces thrust and heat buildup, but the non-coolant-through design means chip evacuation and cutting fluid supply become the practical limits during sustained cuts.
Does the TiN coating change the noise or heat profile during all-day drilling?
The coating lowers friction at the cutting edges, which can slightly reduce generated heat and cutting noise compared with an uncoated cobalt bit of the same geometry.
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