Chicago-Latrobe
Chicago-Latrobe 44921 21/64" Cobalt TiN 135° Jobber Drill Bit
Cobalt jobber drill bit with TiAlN coating and 135° split point for 21/64" holes
- TypeDrill Bits
- MaterialHAWA
- Cobalt steel resists heat and wear during heavy drilling
- Titanium aluminium nitride coating extends cutting life
- 135° split point starts on contact without wandering
- Jobber length reaches deeper holes in one pass
- Exact 21/64" diameter matches fractional specifications
Chicago-Latrobe 44921 Cobalt Jobber Bit
The Chicago-Latrobe 44921 is a fractional-inch jobber drill bit sized 21/64 inch with a decimal equivalent of .3281. It features a 135-degree split point made from cobalt material with a TiAlN surface treatment. This bit suits maintenance technicians and metalworkers who need a durable cutter for general-purpose drilling in steel and alloys.
Installation and common issues
The split point design allows the bit to start on contact without a centre punch, reducing walking on hard surfaces. Secure the workpiece firmly and use a drill press or stable hand drill aligned perpendicular to the surface. Common problems include premature wear if run at excessive speed without lubrication, and chipping if the feed pressure is too aggressive for the cobalt substrate.
Check your setup before ordering
Verify that your drill chuck accepts a straight shank of this diameter and that the machine can deliver the lower RPM range suitable for cobalt tooling in metal. Confirm the 21/64 inch size matches the hole specification required for your fastener or tapping chart. This bit has no coolant holes, so external flood or mist coolant must be available for deep holes. Buyers needing coolant-through capability or a different point angle should select another tool.
Highlights
- Cobalt steel resists heat and wear during heavy drilling
- Titanium aluminium nitride coating extends cutting life
- 135° split point starts on contact without wandering
- Jobber length reaches deeper holes in one pass
- Exact 21/64" diameter matches fractional specifications
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How do I confirm the 135° split point on the 21/64" bit is cutting correctly after I install it?
The split point should self-centre immediately and produce short, curled chips in steel without needing a centre punch.
What comes in the package for the 44921 drill bit and is any accessory sold separately?
The box contains the single 21/64" cobalt jobber bit with TiAlN coating; no extra accessories are included or required.
When should I choose the 21/64" size over other fractional sizes in this cobalt TiAlN series?
Select the 21/64" (0.3281") bit when the hole diameter must match that exact fractional specification.
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