5/8 in x 18 in High Speed Steel Extra Long Drill Bit - Extra Reach

In this review of the 5/8 in x 18 in High Speed Steel Extra Long Drill Bit the bottom line is straightforward: this is a practical pick for jobs that need extra reach when drilling iron or steel. The reviewer found the bit useful for maintenance and production tasks where a standard length would not reach, and its high-speed steel construction balances hardness and toughness for general purpose work. While not specialized for hardened alloys, it delivers dependable performance and chip evacuation when used with appropriate speeds and coolant.

Key Features

• Extra length: The 18 in length provides extended reach for drilling through assemblies or deep setups that standard bits cannot access.
• High-speed steel construction: Offers a combination of hardness and toughness that helps resist wear for general purpose drilling in iron and steel families.
• Black oxide treatment: Adds lubricity and helps hold coolant near the cutting edge to reduce heat and improve tool life in many applications.
• Round shank: Works with a wide variety of toolholding systems so it can be used in different drill chucks and holders.
• Spiral flutes: Right-hand spiral flutes evacuate chips up and out of the hole to reduce clogging during normal cutting direction.
• Bright finish option: Provides improved chip evacuation for consistent drilling when chip removal matters.

Who It's For

This drill bit is best suited to mechanics, maintenance technicians, and fabricators who regularly need extra reach to work inside assemblies, through stacked plates, or in deep jigs where a standard bit falls short. It is a good general purpose option for shops that process a range of ferrous materials and want a dependable, long-reach twist drill on the shelf.

Those who should look elsewhere include users who routinely drill hardened steels, stainless where specialized coatings or grades are needed, or those requiring guaranteed fracture resistance under extreme side loads; in those cases a specialty cobalt, carbide, or coated bit designed for those alloys is a better choice.

Pros & Cons

Pros

• Dependable high-speed steel construction that balances wear resistance and toughness for general use.
• Long 18 in length provides reach for deep holes and assemblies without stepping bits or extensions.
• Black oxide finish improves lubricity and helps retain coolant at the cutting edge for longer runs.
• Round shank compatibility makes it usable in a variety of toolholders and chucks.

Cons

• Mixed customer reports on durability mean it can break under heavy side loading or improper use, so care is required.
• Not intended for highly abrasive or hardened alloys where specialized grades or coatings are necessary.

Specifications

Brand	Drill America
Series	DWDDL
Diameter	5/8 in
Length	18 in
Material	High-speed steel
Shank	Round shank
Finish	Black oxide / bright finish options implied

Our Verdict

The 5/8 in x 18 in extra long HSS drill bit is a sensible, good-value choice for workshops and maintenance crews that need reach in iron and steel applications. It combines durability for routine drilling with useful chip evacuation features, but it should be used within its general purpose limits to avoid breakage; for hard or highly abrasive materials choose a specialized grade instead.

Frequently Asked Questions

Can this bit be used in a regular drill chuck?
Yes, the round shank is compatible with most drill chucks and common toolholding systems.

Is the bit suitable for stainless or hardened steel?
It is designed for a broad range of iron and steel family materials, but for hardened or highly abrasive stainless steels a cobalt or coated specialty bit is recommended.

Does the black oxide finish improve performance?
Yes, black oxide adds lubricity and helps retain coolant at the cutting edge, which can extend tool life in many jobs.