Chicago-Latrobe
Chicago-Latrobe 54127 25PC 135 Degree Cobalt Jobber Length Drill Bit Set
A 25-piece cobalt jobber-length drill bit set with a 135-degree point angle for heavy-duty drilling
- TypeDrill Bits
- 25-piece set covers a wide range of drilling tasks
- 135-degree split point reduces walking for accurate hole starts
- Cobalt steel construction withstands high heat in tough materials
- Straw/bronze finish adds lubricity and corrosion resistance
- Jobber length design suits general-purpose drilling in metal and wood
25-Piece Cobalt Jobber Drill Set
This Chicago-Latrobe 54127 set supplies 25 jobber-length drill bits made from cobalt steel. The 135-degree split point reduces walking and starts holes cleanly in tough alloys. A straw-bronze surface finish helps identify the bits and resists corrosion during storage. The assortment covers a range of diameters for general workshop drilling.
Suited to metal fabrication and maintenance
Machinists and maintenance technicians who regularly drill stainless steel, titanium or high-strength steels will benefit from the heat resistance of cobalt. The 135-degree geometry also improves chip evacuation in deep holes. Builders who only drill wood, plastic or soft aluminium will not gain an advantage over standard high-speed steel bits and should consider a less specialised set.
135-degree split point on cobalt steel
The decisive specification is the 135-degree point angle combined with cobalt material. This pairing delivers the self-centering start and high-temperature hardness needed for hard metals. If the application does not require drilling hardened or work-hardening alloys, the extra cost of cobalt is not justified.
Highlights
- 25-piece set covers a wide range of drilling tasks
- 135-degree split point reduces walking for accurate hole starts
- Cobalt steel construction withstands high heat in tough materials
- Straw/bronze finish adds lubricity and corrosion resistance
- Jobber length design suits general-purpose drilling in metal and wood
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
Questions about this item
What chuck size is required for the 135 degree cobalt jobber length bits in this 25-piece set?
These jobber length drill bits feature straight shanks designed to fit standard drill chucks. The 135 degree split point reduces walking and provides faster penetration in hard materials like stainless steel.
How do I correctly install the 135 degree split point cobalt bits to avoid breakage?
Secure the bit fully in the chuck jaws, ensuring the shank is centred. Apply steady pressure and use cutting fluid; the 135 degree point is self-centring but excessive force or high RPM without lubrication causes premature wear or snapping.
When should the 25 cobalt drill bits in this set be replaced or resharpened?
Replace or resharpen when the 135 degree split point becomes rounded, cutting edges chip, or the straw/bronze finish wears off indicating heat damage. Cobalt holds an edge longer than high-speed steel but cannot be restored once the temper is lost.
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