Chicago-Latrobe
Chicago-Latrobe 46712 #42 135° Cobalt Jobber Drill Bit
A #42 cobalt jobber drill bit with a 135° split point for precise starting in hard metals
- TypeDrill Bits
- MaterialHAWA
- #42 wire-gauge size for precise small-hole drilling
- 135° split-point angle starts on contact without walking
- Cobalt steel construction resists heat and wear in hard materials
- Jobber length gives standard reach for general-purpose use
- Straw-bronze surface finish identifies the cobalt alloy grade
Chicago-Latrobe 46712 #42 Cobalt Drill Bit
This Chicago-Latrobe 46712 drill bit is a jobber-length cutting tool made from HAWA cobalt material. It carries the #42 wire gauge size with a decimal equivalent of .0935 inches. The 135-degree split point is designed to reduce walking and start accurately on contact. It suits machinists and maintenance technicians drilling hard metals such as stainless steel or high-strength alloys.
Suited for hard-metal drilling.
The cobalt construction and 135-degree split point make this bit suitable for users who need wear resistance and self-centering starts in tough materials. Buyers who require coolant-through capability should look elsewhere because this bit has zero coolant holes. It is also not intended for applications that demand a different point geometry or a coated surface for specific material interactions.
135-degree split point defines the start behaviour
The single specification that decides fit is the 135-degree split point angle. This geometry determines how the bit engages the workpiece without a centre punch and how it manages chip formation in hard metals. If the drilling operation calls for a different point angle or a standard point without split geometry, this bit will not match the required cutting action.
Highlights
- #42 wire-gauge size for precise small-hole drilling
- 135° split-point angle starts on contact without walking
- Cobalt steel construction resists heat and wear in hard materials
- Jobber length gives standard reach for general-purpose use
- Straw-bronze surface finish identifies the cobalt alloy grade
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
What size drill chuck is needed to hold the #42 shank?
A standard drill chuck that closes to at least 0.0935 inches will grip the #42 shank securely.
Will the 135° split point start cleanly on the hardened steel I usually drill with older high-speed bits?
The 135° split point is designed to self-center and reduce walking on tough materials such as hardened steel.
How can I confirm the bit is cutting correctly once I begin drilling?
Look for short, tightly curled chips and a steady feed without excessive pressure or squealing.
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