Drill America W Cobalt Drill Bit Pack of 6 - Durable Metal Drilling

In this review of the Drill America W Cobalt Drill Bit (Pack of 6) the bottom line is straightforward: these are jobber length cobalt drill bits for users who need reliable performance when cutting tougher metals. Built from heat-resistant cobalt and manufactured to National Aerospace standard 907, they are aimed at tradespeople and home fabricators who often drill stainless steel, high carbon steel, or nickel alloys and need bits that stay sharp and tolerate higher speeds.

Key Features

• Cobalt construction: The heat resistant cobalt composition provides higher red hardness so the bits can run up to 30 percent faster than typical high-speed steel for tougher materials.
• Gold oxide finish: A thin oxide surface treatment protects the flutes while maintaining cutting performance similar to uncoated tools for consistent chip formation.
• Round shank: Round shanks allow use with a wide variety of toolholding systems so they fit standard chucks and drill holders.
• Spiral flute design: Right-hand spiral flutes evacuate chips up and out of the cut to reduce clogging when drilling deeper holes.
• Manufacturing standard: Produced to National Aerospace standard 907, indicating consistent dimensions and quality suitable for demanding work.

Who It's For

The Drill America DWDCO series is best for machinists, metalworkers, and serious DIYers who regularly drill high tensile strength materials like PH stainless steel, inconel, titanium, or thick galvanized and high carbon steels. These customers will appreciate the increased red hardness and the ability to push speeds higher than with conventional high-speed steel.

Those who only drill softwoods, plastics, or occasional light-duty metal may find standard HSS bits more cost effective; also users requiring specialized coatings for extreme wear resistance should consider coated carbide or specialized surface-treated tooling instead.

Pros & Cons

Pros

• Durable cobalt material stays sharp and tolerates higher cutting speeds for tough alloys.
• Gold oxide finish preserves flute function without compromising cutting action.
• Works well across a range of metals, with customer reports of good drilling through galvanized and high carbon steel.

Cons

• Geometry received mixed feedback from users, so performance may vary by application and set size chosen.
• Not coated for extreme wear situations where carbide or specialized coatings would last longer.

Specifications

Series	DWDCO
Quantity	Pack of 6
Material	Cobalt steel (heat resistant)
Length	Jobber length
Finish	Gold oxide (thin oxide)
Shank type	Round shank
Standard	Manufactured to National Aerospace standard 907

Our Verdict

The Drill America W Cobalt Pack of 6 is a solid value for anyone needing dependable performance drilling harder metals; its heat resistant cobalt alloy and jobber length make it versatile for shop and field work. For the price and construction it is a practical choice for metalworkers who want bits that hold an edge and run hotter than HSS, though those needing the highest wear life in abrasive or production environments may prefer carbide options.

Frequently Asked Questions

Are these bits good for stainless steel?
Yes, the cobalt construction is specifically suited to stainless and other high tensile alloys and permits higher speeds than standard HSS.

Will they fit a standard drill chuck?
Yes, the round shanks allow use with a wide variety of standard chucks and toolholding systems.

What does the gold oxide finish do?
The thin gold oxide is a surface treatment that protects the flutes while maintaining cutting performance similar to uncoated tools.