Cleveland Golf
Cleveland Golf Jobber Drill 21/64 Cobalt Parabolic 135° 2075
Cobalt steel jobber drill with a 135° notch point and parabolic flutes for efficient chip removal in tough materials
- TypeAngle, Pitch & Slope Locators
- Drills hard metals with 135-degree notch point
- Parabolic flutes clear chips from deep holes
- Cobalt steel resists heat during extended use
- 21/64 inch diameter matches fractional specifications
- Straw bronze finish reduces friction and wear
Cleveland Golf Jobber Drill 21/64 Cobalt
This cobalt steel jobber drill bit handles high-performance drilling tasks in tough materials. The 135-degree notch point reduces walking and starts holes cleanly. Fractional sizing at 21/64 inch suits precise workshop requirements. Right-hand cutting direction matches standard drill chucks.
Parabolic flute upgrades standard twist geometry
Parabolic flutes evacuate chips faster than conventional twist drills, especially in deep holes. The straw bronze finish resists wear during extended use. Upgrade when standard bits overheat or clog in stainless steel or titanium alloys. High-performance grade justifies the step up for production runs.
Straight shank fits common three-jaw chucks
Shank diameter matches the 21/64 inch drill size for direct insertion without sleeves. Overall length of 4-5/8 inches and flute length of 3-5/16 inches reach standard depths. Cobalt steel hardens quickly if run dry; use cutting fluid to prevent premature dulling. Non-coolant-through design requires external lubrication.
Highlights
- Drills hard metals with 135-degree notch point
- Parabolic flutes clear chips from deep holes
- Cobalt steel resists heat during extended use
- 21/64 inch diameter matches fractional specifications
- Straw bronze finish reduces friction and wear
Specifications
| Brand | Cleveland |
|---|---|
| Type | Angle, Pitch & Slope Locators |
Questions about this item
What chuck size is required for the 21/64 inch shank?
A chuck that opens to at least 21/64 inch (0.3281 decimal) is needed to hold the shank securely.
How do you install the cobalt parabolic drill bit without damaging the 135-degree notch point?
Insert the bit fully into the chuck, tighten evenly on the 21/64 shank, and start the hole at low RPM to centre the notch point before applying full pressure.
When should the 2075 jobber drill be replaced or resharpened?
Replace or resharpen when the 135-degree notch point shows visible wear, the parabolic flutes no longer clear chips, or the straw/bronze finish has discoloured from overheating.
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