Chicago-Latrobe
Chicago-Latrobe 54107 Cobalt Jobber Drill Bit 135° .2660
A jobber-length cobalt drill bit with a 135° split point for hard-metal drilling at .2660 diameter
- TypeDrill Bits
- MaterialHAWA
- Cobalt construction resists heat and wear
- 135-degree split point starts holes without walking
- TiN coating reduces friction and extends life
- Jobber length suits general-purpose drilling tasks
- .2660 decimal size matches letter H specification
Chicago-Latrobe 54107 Cobalt Jobber Drill Bit
This Chicago-Latrobe 54107 is a cobalt jobber-length drill bit sized for letter H with a decimal equivalent of .2660. It suits machinists and maintenance technicians who need a durable bit for drilling hard metals such as stainless steel. The 135-degree split point reduces walking and starts the cut without a centre punch.
135-degree split point limits
The 135-degree split point geometry is optimised for harder materials and may produce a less aggressive cut in soft aluminium or plastic. Cobalt steel resists heat but is more brittle than high-speed steel, so heavy feed pressure or interrupted cuts can chip the cutting edges. The bit has no coolant-through holes, so external flood or mist cooling is required for deep holes.
Standard jobber shank fit
The straight shank fits any standard drill chuck or collet that accepts the .2660 diameter, so no special holders are needed. Common issues arise when the chuck is not tightened fully, causing the bit to slip and score the shank. Running the bit without lubrication in stainless steel will overheat the cobalt and dull the corners quickly.
Highlights
- Cobalt construction resists heat and wear
- 135-degree split point starts holes without walking
- TiN coating reduces friction and extends life
- Jobber length suits general-purpose drilling tasks
- .2660 decimal size matches letter H specification
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Which drill bit size should I choose for a 0.2660 inch hole?
This bit is manufactured to a decimal equivalent of .2660 inches and corresponds to letter size H, so it matches that exact diameter.
What does the 135 degree point angle do when drilling metal?
The 135 degree split point reduces walking on hard surfaces and improves centring in steel and stainless alloys.
How does the cobalt construction with TiN coating affect drilling performance?
Cobalt steel with TiN coating resists heat and wear, extending life when drilling tough materials such as stainless steel.
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