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Cobalt jobber drill bit #7, straw bronze finish, parabolic flutes, 135° point

Cleveland Golf

Cleveland Golf Jobber Drill #7 Cobalt 135° Parabolic

SKU CH-A3JD-MGTGA

A #7 cobalt jobber drill with a 135° parabolic flute for stainless and high-strength alloys

  • TypeAngle, Pitch & Slope Locators
  • Cobalt steel construction withstands high heat when drilling hardened alloys
  • 135-degree notch point starts on contact without walking or centre-punching
  • Parabolic flutes eject chips fast to prevent clogging in deep holes
  • Straw bronze finish reduces friction and resists corrosion during extended use
  • Designed for chilled cast iron stainless steel and tool steels

Jobber Drill #7 Cobalt Parabolic

This Cleveland Golf jobber drill is a high-performance cobalt steel cutting tool built for wire-gauge #7 holes. It suits machinists and maintenance technicians who need accurate drilling in tough alloys. The 135-degree notch point and parabolic flute geometry promote efficient chip evacuation. Right-hand cutting direction matches standard machine spindles.

0.2010-inch diameter and 135-degree point

The drill’s decimal size of .2010 inches and 135-degree point angle are the critical specifications that determine fit and cutting behaviour. Shank diameter matches the flute diameter at .2010 inches for true running. Cobalt steel construction with straw/bronze finish resists heat when drilling chilled cast iron, stainless steel and high-strength alloys. List number 2075 identifies this exact configuration.

Parabolic flute sustains chip flow

Parabolic flutes with a 2-7/16-inch flute length move chips continuously during deep-hole work, reducing the risk of packing and overheating that shortens tool life. Non-coolant-through design relies on external flood or mist coolant for temperature control. Cobalt substrate maintains hardness at elevated temperatures better than standard high-speed steel. Overall length of 3-5/8 inches fits typical drill chucks and toolholders.

Highlights

  • Cobalt steel construction withstands high heat when drilling hardened alloys
  • 135-degree notch point starts on contact without walking or centre-punching
  • Parabolic flutes eject chips fast to prevent clogging in deep holes
  • Straw bronze finish reduces friction and resists corrosion during extended use
  • Designed for chilled cast iron stainless steel and tool steels

Specifications

BrandCleveland
TypeAngle, Pitch & Slope Locators

Questions about this item

How does the 135-degree point angle affect drilling in hard metals?

The 135-degree notch point reduces walking and lowers thrust force when starting holes in chilled cast iron, high-strength alloy steel, stainless steel and tool steels.

What does the parabolic flute design change about chip removal?

Parabolic flutes pull chips out of deep holes more efficiently than standard flutes, helping prevent clogging during extended drilling in tough materials.

Will the 0.2010-inch shank fit a standard three-jaw chuck?

Yes, the 0.2010-inch straight shank matches the drill diameter and is sized for common drill chucks and collets used with jobber-length bits.

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