Chicago-Latrobe
Chicago-Latrobe 46491 135° Cobalt Jobber Drill 10.8 mm
135-degree split-point cobalt jobber drill bit cuts 10.8 mm holes in tough metals
- TypeDrill Bits
- MaterialHAWA
- 135° split point starts on contact without wandering
- Cobalt steel resists heat for longer cutting life
- 8 mm metric diameter suits precise hole sizing
- Jobber length gives standard reach for general drilling
- Straw bronze finish identifies the cobalt construction
10.8 mm Cobalt Jobber Drill
This 10.8 mm cobalt jobber drill bit is designed for drilling hard metals such as stainless steel and high-strength alloys. The 135-degree split point reduces walking and starts the cut immediately without a centre punch. It suits maintenance technicians and metal fabricators who need a durable bit for repeated use in tough materials. The straw-bronze surface finish identifies the cobalt construction and aids chip evacuation.
Sustained drilling in hard alloys
Cobalt steel retains hardness at the elevated temperatures generated during prolonged drilling in tough alloys. The 135-degree point angle distributes cutting forces evenly, which slows wear on the cutting lips when the bit is used continuously. Split-point geometry keeps the bit centred through deep holes, reducing the risk of breakage under steady feed pressure. No internal coolant holes are present, so external lubrication is required for extended operations.
Installation and common issues
The straight shank fits standard three-jaw drill chucks without adapters. Tighten the chuck securely on the shank flats to prevent spin-out under high torque. Because the bit lacks coolant-through channels, apply cutting fluid frequently to avoid overheating and premature dulling. The split point eliminates the need for centre punching on most materials, but a light punch mark helps on very hard or rounded surfaces.
Highlights
- 135° split point starts on contact without wandering
- Cobalt steel resists heat for longer cutting life
- 8 mm metric diameter suits precise hole sizing
- Jobber length gives standard reach for general drilling
- Straw bronze finish identifies the cobalt construction
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How much heat does the 135° cobalt tip generate when drilling steel all day?
The 135° split point and cobalt construction are designed to reduce heat buildup and wear during extended drilling in hard materials.
What shank size must my drill chuck accept for the 10.8 mm bit to fit?
The bit has a standard round shank sized to match its 10.8 mm diameter, so your chuck must open at least that wide.
Will the 0.4252 inch decimal size work in a 3/8 inch keyed chuck?
At 0.4252 inch the bit exceeds a 3/8 inch chuck capacity, so a 1/2 inch or larger chuck is required.
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