Drill America 1-3/4 in Bottoming Tap DWT Series - Re-threads to Hole

In this review of the Drill America DWT Series 1-3/4 in carbon steel bottoming tap, the bottom line is simple: this single bottoming tap is aimed at machinists and maintenance techs who need to restore or complete threads at the very bottom of a blind hole. The reviewer found it most valuable when re-threading damaged or jammed threads and when finalizing threads begun by taper or plug taps. For those working with mild steels or aluminum and preferring a straightforward, uncoated tool, this bottoming tap delivers utility without frills.

Key Features

• Bottoming style: Generates full thread to the bottom of a blind hole so repairs or final thread passes reach the hole base.
• Carbon steel construction: Suited for mild steel and general shop materials, offering good sharpness and straightforward performance for hand or power tapping.
• Straight flute design: Allows chips to collect in the flutes for most shallow-cut applications, reducing clogging during re-threading.
• Uncoated tool: Provides the base substrate without coatings, making it a cost-effective option for common metals and rework tasks.
• Re-threading focus: Specifically used to re-thread damaged or jammed threads, making it useful for repair and maintenance operations.

Who It's For

This bottoming tap is best for shop mechanics, maintenance crews, and hobby machinists who regularly repair damaged threads or need to finish threads at the bottom of blind holes. It is particularly useful when paired with taper and plug taps in a set workflow where the taper starts the thread, the plug follows, and the bottoming tap completes to the base.

It is not intended for hard alloy steels or applications demanding specialized coatings for extended life under high heat or abrasive conditions. Users who require coated or high-speed steel taps for heavy production runs should consider other options.

Pros & Cons

Pros

• Good value for routine re-threading and light shop use.
• Sharp cutting edge and straightforward geometry make it effective in aluminum and mild steel.
• Straight flutes handle chip evacuation well in shallow cuts and rework situations.

Cons

• Carbon steel and uncoated finish limit durability in hard or high-production environments compared to coated or HSS taps.
• Some users report occasional breakage under heavy or repeated use, so careful feed and alignment are required.

Specifications

Product name	1-3/4 in Bottoming Tap, DWT Series
Material	Carbon steel
Style	Bottoming (generates thread to bottom of hole)
Flute type	Straight flute
Coating	Uncoated
Primary use	Re-thread damaged or jammed threads; thread mild steels

Our Verdict

The Drill America 1-3/4 in bottoming tap is a practical, no-frills choice for technicians who need to finish or repair threads at the bottom of blind holes. It offers good sharpness and value for light to moderate use in mild steels and aluminum, but those needing higher durability for heavy production should opt for coated or HSS alternatives.

Frequently Asked Questions

Can this tap be used to re-thread damaged threads?
Yes, it is designed for re-threading damaged or jammed threads and to complete threads to the bottom of holes.

Is this tap suitable for hard steels?
No, carbon steel uncoated taps are best for mild steels and softer materials; use HSS or coated taps for harder alloys.

Can it be used under power?
Yes, hand taps like this are versatile for hand use or light power tapping when properly aligned and fed.