25/64 in Cobalt Drill Bit Pack of 6 - Jobber Length for Tough Metals

In this review the Drill America 25/64 in cobalt drill bit pack is evaluated for workshop and industrial use; the bottom line is that it is a straightforward, durable jobber length bit set ideal for drilling harder metals where standard HSS drills struggle. Made from heat resistant cobalt and manufactured to National Aerospace standard 907, these bits deliver higher red hardness for faster cutting and longer life, which makes them worth considering when working on stainless steel, high carbon steels, nickel alloys, or titanium.

Key Features

• Cobalt steel construction: Provides improved cutting performance and higher red hardness for drilling tougher, high tensile materials with less wear than ordinary HSS.
• Gold oxide finish: A thin oxide surface that identifies the tool while keeping performance similar to uncoated bits for predictable results.
• Round shank compatibility: Round shanks allow use in a wide variety of toolholding systems without specialty adapters.
• Right-hand spiral flutes: Evacuate chips up and out of the hole when run clockwise, reducing clogging and helping maintain cut quality.
• Manufactured to aerospace standard: Built to National Aerospace standard 907 for consistent dimensions and reliability in demanding applications.

Who It's For

These bits are best for metalworkers, fabricators, and serious hobbyists who frequently drill stainless steel, high carbon steel, or nickel alloys and need something that holds an edge better than common HSS jobbers. The pack of six in the specific size suits repeat operations where that hole size is common, such as jig work or fitting fasteners.

Those who only drill soft materials like wood or soft aluminum occasionally may find standard HSS bits sufficient and can save cost by choosing more general-purpose sets. Also, if you need a metric sizing range or coated bits intended specifically to reduce friction for production drilling, look for a different series.

Pros & Cons

Pros

• Durable cobalt construction that stays sharp and cuts through thick galvanized and high carbon steels reliably.
• Good value for six identical jobber length bits in a frequently used fractional size.
• Consistent manufacture to NAS 907 provides predictable fit and performance in chucks and holders.

Cons

• Gold oxide is a thin surface treatment with no significant wear-reducing coating benefit over plain tools.
• Available only in a single size per pack, so additional sizes require separate purchases.

Specifications

Our Verdict

The Drill America 25/64 in cobalt jobber drill bit pack is a practical choice for anyone who needs a reliable bit for tough metals; its cobalt construction and aerospace manufacturing standard make it durable and consistent, offering solid value for dedicated metalworking tasks. Choose this pack when that specific fractional size is used often and you need an edge life and heat resistance beyond standard HSS.

Frequently Asked Questions

Are these bits good for stainless steel?
Yes, the cobalt construction and higher red hardness make them well suited to drilling stainless and other high tensile alloys.

Can these be used in a standard drill chuck?
Yes, the round shank design fits most standard drill chucks and a wide variety of toolholding systems.

Does the gold oxide coating improve wear?
The gold oxide is a thin identification finish; it does not provide the same wear reduction as more robust proprietary coatings but performs similarly to uncoated tools.