Chicago-Latrobe
Chicago-Latrobe 42784 135° Split Point Jobber Drill Bit
A 135° split-point jobber drill bit in high-speed steel with TiAlN coating for letter size N (0.3020)
- TypeDrill Bits
- 135° split point starts drilling on contact without wandering
- TiAlN coating extends bit life in high-speed steel applications
- Jobber length reaches deeper holes while maintaining rigidity
- High-speed steel construction handles general-purpose metal drilling
- Size N (0.3020 in) matches precise letter-gauge specifications
Chicago-Latrobe 42784 135° Split Point Drill Bit
This jobber-length drill bit is manufactured from high-speed steel with a TiAlN coating for extended wear resistance. It suits machinists and maintenance technicians who need accurate holes in metal using standard drill chucks. The 135-degree split-point geometry reduces walking at the start of the cut and improves chip evacuation. Buyers who require coolant-through tooling for deep-hole drilling should select a different design.
135-degree split point limits in portable drilling
The split-point tip self-centres on flat surfaces but can grab or snag when the workpiece is curved, angled or already drilled. Hand-held drills amplify this risk because lateral force is harder to control than in a press. The lack of coolant holes means heat builds quickly in stainless steel or titanium, so cutting speed must be reduced and frequent peck cycles used. The TiAlN coating helps, yet it cannot replace flood coolant in sustained production runs.
Check shank fit and material compatibility before
Verify that your chuck accepts a straight shank of this jobber diameter; the decimal equivalent is .3020 inch and the letter size is N. Confirm the workpiece material is compatible with high-speed steel and dry or mist lubrication only. Ensure the machine spindle run-out is low enough to take advantage of the split-point accuracy. Orders of $75 or more ship free from the supplier.
Highlights
- 135° split point starts drilling on contact without wandering
- TiAlN coating extends bit life in high-speed steel applications
- Jobber length reaches deeper holes while maintaining rigidity
- High-speed steel construction handles general-purpose metal drilling
- Size N (0.3020 in) matches precise letter-gauge specifications
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
Should I choose the 135° split point version or a different point angle for general drilling?
The 135° split point reduces walking and starts on contact, making it a strong all-round choice for metal and hard materials compared to flatter angles.
How does the 135° split point perform once the bit is in the drill?
It self-centres immediately, cuts cooler and clears chips efficiently through the split-point geometry, giving faster penetration in steel.
What shank standard does the 42784 use and what chucks will it fit?
It has a straight round shank sized to the N letter gauge, so it fits any standard three-jaw chuck that accepts that diameter.
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