Drill America 19/64ft Cobalt Heavy Duty Drill Bit Pack of 12 - Durable

In this review the Drill America 19/64' cobalt heavy duty drill bit pack is evaluated for metalworkers and serious DIYers who need a durable twist bit for hard alloys. The bottom line: this pack is best for users drilling stainless steel, nickel alloys, or other high tensile materials because the cobalt steel and jobber length combine to sustain higher speeds and remain sharp longer than typical HSS bits. The review highlights real-world cutting performance, longevity, and where these bits fit in a busy shop.

Key Features

• Cobalt steel construction: Provides improved red hardness so the bits can run up to 30 percent faster than regular high-speed steel when cutting tough metals.
• Gold oxide finish: A thinner oxide surface treatment protects the flutes and helps identification without significantly changing cutting performance compared with uncoated tools.
• Round shank: Ensures compatibility with a wide variety of chucks and toolholding systems for versatile use across drills and drill presses.
• Spiral fluted, right-hand cut: Evacuates chips up and out of the hole to reduce clogging and help maintain clean cuts in deep or sticky materials.
• Manufactured to NAS 907: Aerospace-grade manufacturing standards that indicate consistent geometry and quality across the pack.
• Jobber length: Balances reach and rigidity for general purpose shop tasks without excessive flex during aggressive drilling.

Who It's For

This pack is aimed at professional fabricators, machinists, and advanced hobbyists who routinely drill stainless steel, titanium, inconel, or other high tensile materials and need bits that hold an edge and resist heat. The 19/64' size is useful for plug taps, clearance holes and many mechanical fastener fits common in metalwork.

Those who should look elsewhere include casual users who only drill soft materials like wood or plastic and want cheaper HSS bits, or users needing specialty coatings like TiN for reduced friction on production line setups. If you need a range of sizes rather than a single-size pack, a mixed set would be a better choice.

Pros & Cons

Pros

• Good durability and edge retention when cutting hard alloys thanks to cobalt alloy steel.
• Higher usable speeds than plain HSS bits, reducing cycle time in many metal drilling tasks.
• Consistent manufacturing to NAS 907 gives predictable drilling geometry and performance across the pack.
• Round shank and jobber length make the bits versatile for handheld and machine use.

Cons

• Gold oxide is mainly identification and does not provide the wear resistance of thicker specialty coatings.
• Single size pack limits flexibility; buyers needing multiple diameters will need additional purchases.

Specifications

Brand	Drill America
Diameter	19/64' (single size)
Material	Cobalt steel (heat resistant)
Finish	Gold oxide surface treatment
Length	Jobber length
Shank	Round shank
Manufacturing Standard	National Aerospace Standard 907

Our Verdict

The Drill America 19/64' cobalt heavy duty pack is a solid, value-focused option for anyone drilling tough metals who values longevity and consistent cuts. Its cobalt construction and NAS 907 manufacturing make it worth buying for shops and dedicated hobbyists, though buyers needing more sizes or a wear-resistant coating should consider additional options.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes, the cobalt alloy and higher red hardness make them well suited for drilling stainless steel and other high tensile materials.

Do the bits have a special coating?
They use a gold oxide surface treatment which is thin and primarily for identification; performance is similar to uncoated cobalt bits.

Can these be used in drill presses and handheld drills?
Yes, the round shank and jobber length work with most chucks and toolholders for both handheld and machine applications.