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Cobalt drill bit, 5/16 inch, straw bronze finish, parabolic flutes

Cleveland Golf

Cleveland Golf 5/16 Cobalt Parabolic Drill Bit 135° 2075

SKU CH-R0AM-KTX3R

A 5/16 inch cobalt steel jobber drill bit with a 135 degree point and parabolic flutes for deep hole drilling

  • TypeAngle, Pitch & Slope Locators
  • 135° notch point starts cleanly without walking
  • Parabolic flutes pull chips out of deep holes
  • Cobalt steel keeps its edge in hard metals
  • 5/16 in. shank matches the hole size for rigid drilling
  • Jobber length 4-1/2 in. reaches standard depths

Jobber drill bit for high-performance drilling

The Cleveland Golf 5/16 cobalt parabolic drill bit is built for demanding metalworking tasks. Its 135-degree notch point reduces walking and starts holes cleanly in tough alloys. The parabolic flute geometry pulls chips away efficiently during deep cuts. This fractional-inch tool suits machinists and maintenance technicians who need reliable holemaking in hard materials.

Cobalt steel handles heat and wear

Cobalt steel construction retains hardness at elevated temperatures generated during extended drilling cycles. The straw-bronze finish adds surface lubricity and corrosion resistance without coolant-through capability. Right-hand cutting direction matches standard drill presses and handheld motors. The 135-degree point angle distributes cutting forces to prolong edge life under heavy feed pressure.

Straight shank fits common chucks directly

A 5/16-inch shank diameter matches the drill diameter for true running in three-jaw chucks or collets. Overall length of 4-1/2 inches with a 3-3/16-inch flute length balances reach and rigidity for through-hole work. List number 2075 identifies this specific geometry for reorder tracking. Buyers needing coolant-through channels or left-hand rotation should select a different configuration.

Highlights

  • 135° notch point starts cleanly without walking
  • Parabolic flutes pull chips out of deep holes
  • Cobalt steel keeps its edge in hard metals
  • 5/16 in. shank matches the hole size for rigid drilling
  • Jobber length 4-1/2 in. reaches standard depths

Specifications

BrandCleveland
TypeAngle, Pitch & Slope Locators

Questions about this item

How do I install the 5/16 inch cobalt parabolic drill bit, and what step is often missed?

Secure the 5/16 inch shank fully in the chuck, align the 135 degree notch point with the marked centre, and start drilling at low speed; the step often missed is clearing chips from the parabolic flutes every few seconds.

What maintenance or replacement will the cobalt drill bit need later?

The cobalt steel cutting edges dull over time; resharpen the 135 degree notch point on a proper grinder or replace the bit when the straw/bronze finish shows heavy wear or the parabolic flutes no longer eject chips cleanly.

What limit appears first during sustained drilling with the 135 degree point?

Heat builds up quickly in the cobalt steel because the bit is non-coolant-through; the 135 degree notch point loses hardness first, so pause frequently to let the tool cool and prevent premature edge failure.

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