39/64in x 12in HSS Extra Long Drill Bit with 1/2in Shank - Extra Reach

In this review the Drill America 39/64in x 12in HSS Extra Long Drill Bit is judged as a practical choice for jobs that demand extra reach without stepping up to carbide. It is aimed at hobbyists, fabricators, and maintenance techs who work in iron and steel where a longer bit is needed; the single biggest reason to buy is its combination of extra length and a conventional 118 degree point that makes it straightforward to start holes and reach past obstacles.

Key Features

• High-speed steel construction: Provides a useful balance of hardness and toughness for general purpose drilling in iron and steel materials.
• Black oxide finish: Adds lubricity and helps retain coolant near the cutting edge to reduce friction and extend bit life when used properly.
• Extra long length: The 12in length gives significant reach for drilling through assemblies or awkward workpieces that shorter bits cannot access.
• 118 degree point: A conventional tip that helps the bit center and start holes cleanly in a broad range of ferrous materials.
• Round 1/2in shank: Fits a wide variety of toolholding systems and is easy to clamp in standard chucks and collets.
• Spiral flutes: Right-hand spiral evacuates chips up and out of the hole to reduce clogging on deep cuts.

Who It's For

This drill bit is best for home shop owners, light industrial users, and maintenance personnel who regularly drill into mild steel, cast iron, and similar materials and need additional reach beyond standard lengths. It is a sensible choice when extra length is required but carbide or specialty coatings are not necessary.

Those who frequently drill hardened steels, stainless in production volumes, or require maximum durability under heavy feed should look elsewhere to carbide or higher-performance coatings; likewise, users who need extreme precision at high RPMs may prefer specialized bits designed for that purpose.

Pros & Cons

Pros

• Good general-purpose toughness from HSS construction for common iron and steel tasks.
• Extra long 12in length solves reach problems without adapters or extensions.
• Black oxide finish improves lubrication and coolant retention during drilling.
• Round 1/2in shank works in most chucks and holders for easy setup.

Cons

• Durability reports are mixed; some users note the bit can break under heavy side loads or aggressive feeds.
• Not optimized for very hard steels or high-production stainless use compared with carbide or specialized coated bits.

Specifications

Diameter	39/64in
Overall length	12in
Shank	Round 1/2in
Material	High-speed steel (HSS)
Point angle	118 degree conventional tip
Finish	Black oxide

Our Verdict

The Drill America 39/64in x 12in HSS Extra Long Drill Bit is a practical, cost-effective option for anyone who needs reliable extra reach for drilling iron and steel. It delivers useful cutting performance and chip evacuation for general workshop tasks, but buyers should avoid aggressive side loads and consider stronger materials for high-production or very hard metal work.

Frequently Asked Questions

Can this bit be used in a hand drill?
Yes, the round 1/2in shank fits most hand drill chucks, but users should run at appropriate speeds and avoid excessive side pressure to reduce breakage risk.

Is this bit suitable for stainless steel?
It can drill softer grades of stainless in occasional use, but for frequent stainless work a carbide or specialty coated bit is a better choice.

Does the black oxide improve life?
The black oxide adds lubricity and helps retain coolant at the edge, which can extend life in many general purpose drilling applications.