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Cobalt jobber drill bit, 12 mm, straw bronze finish, split point, 135 degree angle

Cleveland Golf

Cleveland Golf Jobber Drill 12mm Cobalt 135° NAS 907

SKU CH-RA93-39Y7B

12 mm cobalt jobber drill with 135° split point to NAS 907, 151 mm overall length and 101 mm flute

  • Product typeAngle, Pitch & Slope Locators
  • 12 mm cobalt steel resists heat and wear
  • 135° split point starts cleanly without wandering
  • NAS 907 compliant for aerospace-grade precision
  • 151 mm overall length with 101 mm flute clears chips efficiently
  • 4724 in decimal equivalent matches metric spec exactly

12 mm Cobalt Jobber Drill

The Cleveland Golf Jobber Drill is a 12 mm cobalt steel cutting tool built to National Aerospace Standards 907 Type J. Its 135-degree split point reduces wandering and starts holes cleanly in hard alloys. The straw-bronze finish identifies the heavy-duty grade and resists wear during repetitive drilling.

Suited for aerospace and precision metalwork

Machinists drilling stainless steel, titanium or high-strength alloys will benefit from the cobalt substrate and split-point geometry. Shops that mainly work mild steel, wood or plastic do not need this grade and can choose a less expensive high-speed steel bit instead.

Simple to use in any standard chuck

The straight 12 mm shank fits three-jaw chucks and collets without adapters. Right-hand spiral flutes eject chips efficiently when the correct feed and speed are applied. Running the drill too fast or without lubrication in tough metals is the most common cause of premature edge wear.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $20.99
Cheaper than about 56% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameCleveland
Product typeAngle, Pitch & Slope Locators

Questions about this item

What chuck size do I need to hold the 12mm shank on this drill bit?

The bit has a 12.00mm shank diameter, so you need a chuck that opens to at least 12mm or ½ inch capacity to grip it securely.

Can I use this cobalt jobber drill in the same drill press where I run older high-speed steel bits?

Yes, the 135° split point and right-hand cutting direction work in standard drill presses and hand drills that accept a 12mm shank, just like your existing HSS bits.

How can I confirm the bit meets the NAS 907 Type J standard after I receive it?

The flute length measures 101.00mm and the overall length is 151.00mm, matching the NAS 907 Type J dimensions for a 12.00mm jobber drill.

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