Chicago-Latrobe
Chicago-Latrobe 47723 23/64 in 135° Cobalt Jobber Drill Bit
A 23/64 inch cobalt jobber drill bit with a 135-degree split point for heavy-duty drilling
- TypeDrill Bits
- MaterialHAWA
- 23/64 in size drills precise fractional holes
- 135-degree split point starts fast without wandering
- Cobalt HAWA material resists heat in hard metals
- Jobber length reaches deep workpieces easily
- Decimal equivalent .3594 matches exact specifications
Precision Cobalt Drill Bit
The Chicago-Latrobe 47723 is a jobber-length twist drill made from HAWA cobalt steel for drilling tough metals. Its 135-degree split point reduces walking and starts holes cleanly without a centre punch. The 23/64 inch diameter (0.3594 decimal equivalent) suits maintenance, fabrication and automotive work where standard high-speed steel dulls quickly. The straw-bronze surface identifies the cobalt grade and resists heat buildup.
135-Degree Split Point Limits
The split-point geometry self-centres on flat surfaces but can grab or chip on curved pipe, angled entries or thin sheet metal unless the workpiece is firmly clamped. Cobalt steel holds an edge at higher temperatures than standard HSS, yet it is more brittle; heavy feed rates or interrupted cuts risk corner breakdown. The tool has no internal coolant holes, so deep holes in stainless or titanium alloys require frequent pecking and external flood coolant to evacuate chips and control heat.
Installation And Common Issues
The straight shank fits any three-jaw chuck or collet sized for 23/64 inch; ensure jaws grip the shank fully, not the flutes, to prevent run-out. Because the bit lacks a reduced shank, it will not fit 1/2-inch-capacity chucks — a mismatch that is the most frequent cause of returns. Cobalt flutes work-harden if run at excessive speed with light feed; use the recommended surface-speed range for the material and maintain steady pressure to avoid glazing the cutting edges.
Highlights
- 23/64 in size drills precise fractional holes
- 135-degree split point starts fast without wandering
- Cobalt HAWA material resists heat in hard metals
- Jobber length reaches deep workpieces easily
- Decimal equivalent .3594 matches exact specifications
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Should I choose the 23/64 in size or a different diameter?
Select the 23/64 in bit when your project requires a hole of exactly 0.3594 in decimal equivalent; choose another fractional size only if the drawing specifies a different diameter.
How does the 135 degree split point perform when drilling metal?
The 135 degree split point reduces walking and starts cutting immediately in hard materials such as stainless steel, making the cobalt bit effective for tough alloys without a centre punch.
What does the jobber length standard mean for reach and rigidity?
Jobber length gives a standard flute and overall length for the 23/64 in diameter, balancing reach and stiffness for general-purpose machine or hand drilling.
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