Chicago-Latrobe
Chicago-Latrobe 54058 1/4" Cobalt TiN 135° Jobber Drill Bit
A 1/4-inch cobalt jobber drill bit with a TiN coating and 135-degree split point for accurate drilling in hard metals
- TypeDrill Bits
- MaterialHAWA
- Cobalt construction withstands high heat drilling
- TiN coating reduces friction and extends bit life
- 135 degree split point starts on contact without walking
- Jobber length suits general purpose drilling tasks
- Fractional 1/4 inch size matches common chuck capacity
1/4" Cobalt TiN Jobber Drill Bit
This 1/4 inch cobalt drill bit with TiN coating targets professionals and serious DIY users drilling hard metals such as stainless steel. The 135 degree split point reduces walking and starts holes cleanly. Decimal equivalent is .2500 inch. It is built for repetitive use in demanding workshops.
Easy install with standard chucks
The straight shank fits any 1/4 inch capacity drill chuck without adapters. The split point design self-centres, so pilot holes are rarely needed. Common issues include overheating if feed pressure is too high or cutting fluid is omitted, which can dull the cobalt edge prematurely.
Limits of jobber length geometry
Jobber length provides standard reach but limits deep-hole drilling compared to taper-length or aircraft-extension bits. The 135 point angle excels in hard materials but can grab in soft aluminium or plastics without reduced feed. TiN coating wears eventually; resharpening restores geometry but removes the surface treatment. Proposition 65 warning applies.
Highlights
- Cobalt construction withstands high heat drilling
- TiN coating reduces friction and extends bit life
- 135 degree split point starts on contact without walking
- Jobber length suits general purpose drilling tasks
- Fractional 1/4 inch size matches common chuck capacity
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How can I confirm the 135° split point is cutting correctly after I start drilling?
The 135° split point should self-centre without a centre punch and produce short, curled chips in steel; if it wanders or makes long strings, the bit is dull or the feed is wrong.
Does the 54058 come as a single bit or in a set, and do I need a separate pilot drill?
The 54058 is sold as an individual 1/4" jobber-length bit; no pilot drill is required because the split point starts its own hole.
When should I choose this 1/4" cobalt TiN bit instead of a smaller or larger fractional size?
Pick the .2500" size when the hole must be exactly 1/4 inch; step down for pilot holes or up for clearance holes in the same material.
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