Chicago-Latrobe
Chicago-Latrobe 47708 135° Cobalt Jobber Drill Bit
1/8 inch cobalt jobber drill bit, model 47708, with 135-degree split point for hard-metal drilling
- TypeDrill Bits
- MaterialHAWA
- 135° split point starts on contact without walking
- Cobalt steel resists heat for longer cutting life
- 1/8 in fractional size fits standard chucks
- Jobber length gives reach for deep holes
- Straw bronze finish shows genuine cobalt construction
135° Cobalt Jobber Drill Bit
The Chicago-Latrobe 47708 is a 1/8 inch fractional drill bit designed for general-purpose metal drilling. Its 135-degree split point reduces walking and starts holes cleanly without a centre punch. The cobalt construction resists heat and wear better than standard high-speed steel. It suits maintenance technicians and fabricators who need reliable performance on stainless steel and other tough alloys.
Sustained heat resistance and chip control
Cobalt alloy retains hardness at higher temperatures, so the cutting edges stay sharp during repeated holes or deeper cuts. The split-point geometry produces smaller chips that clear the flutes more easily, lowering the risk of binding. Without coolant-through holes, the bit relies on external lubrication or periodic withdrawal to manage heat in prolonged operations.
Straightforward chuck fit and common pitfalls
The straight shank fits any standard three-jaw chuck sized for 1/8 inch or 3 mm capacity. No special adapters or collets are required. The most frequent issues are excessive feed pressure that chips the brittle cobalt edge and insufficient lubrication that accelerates wear. Using a pecking cycle and cutting fluid prevents both problems.
Highlights
- 135° split point starts on contact without walking
- Cobalt steel resists heat for longer cutting life
- 1/8 in fractional size fits standard chucks
- Jobber length gives reach for deep holes
- Straw bronze finish shows genuine cobalt construction
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How much heat does the 135° split-point cobalt bit generate during extended drilling sessions?
The 135° split-point geometry reduces thrust and friction, so the cobalt steel runs cooler than standard bits during prolonged use.
What chuck size is required to hold the 0.1250-inch shank of this drill bit?
Any 1/4-inch or larger drill chuck will securely grip the 1/8-inch shank on this jobber-length bit.
Will this cobalt bit outlast high-speed steel bits when drilling through hardened steel on my older drill press?
Yes, the cobalt alloy maintains hardness at higher temperatures, giving longer life in tough materials even on lower-rpm machines.
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