Drill America m1.6 x.35 High Speed Steel 2 Flute Bottoming Tap (Pack

In this review the Drill America m1.6 x.35 bottoming tap pack is judged for small-thread work where reaching the bottom of a blind hole matters most. The reviewer finds these uncoated high speed steel taps best for re-threading and finishing threads to the bottom of holes, offering sharp cutting geometry and a useful pack quantity for repetitive jobs. While thread accuracy and toughness vary by material and user technique, the set delivers reliable cutting performance on softer metals and general workshop tasks.

Key Features

• Bottoming style: Generates a full thread to the bottom of a blind hole so you can finish threads where plug and taper taps cannot reach.
• High speed steel construction: Provides a balance of toughness and edge retention for hand use and light machine tapping.
• Two flute geometry: Offers efficient chip clearance and smooth cutting in softer ferrous and nonferrous materials.
• Pack quantity: A dozen taps mean fewer interruptions to resharpen or replace tools during batch or maintenance work.
• Uncoated tool: The bare substrate gives a predictable cutting feel and is suitable for a wide range of common workshop applications.

Who It's For

This tap pack suits machinists, maintenance techs, and hobbyists who frequently work on small-diameter threads and need to fully form threads at the bottom of blind holes. It is particularly handy for projects in cast aluminum, sheet metal, and general machine work where a sharp cutting edge and precise bottoming action are required.

Those who regularly tap hardened steels, require specialized coatings for longer life, or need premium carbide taps for heavy CNC production may want to look elsewhere. Also, users who expect long-term durability under high torque should be aware that occasional breakage has been reported and plan accordingly.

Pros & Cons

Pros

• Sharp cutting edge and good cut quality in aluminum and mild steel without excessive chatter.
• Designed to generate threads to the bottom of holes, making it useful for blind-thread applications.
• High speed steel construction gives versatile use for hand tapping and light machine tapping.

Cons

• Some users report durability issues under heavy use, with occasional tap breakage.
• Uncoated finish may wear faster than coated alternatives in abrasive or high-heat applications.

Specifications

Our Verdict

The Drill America m1.6 x.35 bottoming tap pack is a practical choice for hobbyists and shop technicians who need to form or re-thread small blind holes without splurging on specialty taps. It delivers sharp cutting action and consistent bottoming performance, representing good value for occasional to moderate use; however, those needing maximum durability or coated tool life should consider higher-spec options.

Frequently Asked Questions

Can these taps be used by hand?
Yes, they are high speed steel hand taps designed for hand use and light machine or CNC tapping.

Are these taps coated for extra life?
No, these are uncoated HSS taps, offering the bare substrate without additional surface treatments.

Will they cut hardened steel?
They are best for general machine tapping in softer metals; hardened steels may cause faster wear or breakage, so use appropriate taps for hard materials.