Cleveland Golf
Cleveland Golf Jobber Drill 1/8 In Cobalt Black Oxide 135 Deg 3780
Cobalt jobber drill with 135-degree split point for alloy, carbon, stainless and tool steel
- TypeAngle, Pitch & Slope Locators
- Cobalt steel resists heat in tough alloys
- 135° split point starts on contact without wandering
- Black oxide finish reduces friction and chip welding
- 1/8 in. shank fits standard drill chucks directly
- Heavy-duty grade handles stainless and tool steel
Jobber Drill Bit for Metalworking
This cobalt steel jobber drill bit measures 1/8 inch in diameter with a 135-degree split point for self-centering starts. The black oxide finish adds lubricity and resists corrosion during heavy-duty drilling. It suits machinists and maintenance technicians cutting alloy, carbon, stainless or tool steels. The 2-3/4 inch overall length and 7/8 inch flute length provide a 4xD depth-to-diameter ratio.
Thermals Noise and Power Draw
Cobalt steel retains hardness at elevated temperatures generated when drilling tough alloys, reducing premature wear. The black oxide surface holds cutting fluid to lower friction and heat buildup in the cut zone. Spiral flutes evacuate chips efficiently, preventing packing that increases torque and motor load. Right-hand cutting direction matches standard drill press and handheld drill operation.
Upgrade From High-Speed Steel Bits
This bit replaces general-purpose high-speed steel drills that dull quickly in stainless or tool steel. The heavy-duty cobalt construction justifies the step up when hole counts rise or material hardness exceeds HSS capability. Shops drilling occasional mild steel will not see proportional benefit over standard bits. The split-point geometry eliminates the need for centre punching in many setups.
Highlights
- Cobalt steel resists heat in tough alloys
- 135° split point starts on contact without wandering
- Black oxide finish reduces friction and chip welding
- 1/8 in. shank fits standard drill chucks directly
- Heavy-duty grade handles stainless and tool steel
Specifications
| Brand | Cleveland |
|---|---|
| Type | Angle, Pitch & Slope Locators |
Questions about this item
How do I install the 1/8 in cobalt jobber drill bit and what step is often missed?
Chuck the 1/8 in shank tightly in a drill press or hand drill, ensure the split point centres without a pilot hole, and apply steady pressure at the correct speed for alloy, carbon, stainless or tool steel.
What maintenance or replacement will this 3780 drill bit need later?
The cobalt steel cutting edges dull with use; resharpen the 135 degree split point or replace the bit when holes become oversized or cutting forces rise.
What limit appears first during sustained drilling with this 0.1250 inch bit?
Heat buildup in the 7/8 in flute length reduces cutting efficiency; use peck drilling and coolant to manage temperature in deep holes.
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