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Silver HSS jobber drill bit, 39/64 inch, black oxide finish

Drill America

Drill America D/AN39/64 39/64in HSS Black Oxide Jobber Drill Bit pneumatic accessory

SKU CH-4Y3B-J9PJ1 MPN D/AN39/64

A 39/64-inch high-speed steel jobber drill bit with black oxide coating for general-purpose drilling

  • Product typeDrill Accessories
  • 39/64 inch diameter drills large holes accurately
  • HSS steel resists heat during extended drilling
  • Black oxide finish reduces friction and wear
  • Jobber length 7-1/8 inch reaches deep workpieces

39/64in HSS Jobber Drill Bit

The Drill America D/AN39/64 is a high-speed steel jobber length drill bit with a black oxide surface treatment. It is designed for general-purpose drilling in metal, wood, and plastic for professional and DIY users. The bit features a 39/64 inch diameter with a decimal equivalent of .6094.

Flute length 5-3/16in overall 7-1/8in

The flute length measures 5-3/16 inches and the overall length is 7-1/8 inches. The black oxide finish helps reduce friction and improves chip flow during operation. This accessory suits pneumatic and power drill applications requiring this specific size.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $19.99
Cheaper than about 64% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameDrill America
Model nameD/AN39/64
Product typeDrill Accessories

Questions about this item

How do I install the 39/64in HSS jobber drill bit in a pneumatic drill chuck without damaging the shank?

Open the chuck fully, insert the straight shank until it seats against the jaws, then tighten evenly using the chuck key or sleeve; the step most people skip is verifying the bit runs true before applying full pneumatic pressure.

When will the black-oxide coating on this 39/64in bit need replacement, and what indicates it is worn?

The coating wears gradually; replace the bit when the cutting edges no longer produce clean chips in steel or when the flute shows visible rounding, typically after drilling multiple holes at the rated 39/64 diameter.

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