Drill America 1-1/4ft-12 UNF High Speed Steel Plug Tap - Precise

In this review the Drill America 1-1/4'-12 UNF High Speed Steel Plug Tap is evaluated for machinists and hobbyists who need a reliable hand tap for creating or restoring UNF threads. The bottom line: this single plug tap is best when you need a sharp, uncoated High Speed Steel tool for through holes and general machine or hand tapping, offering precise thread cutting in common materials like aluminum while being simple and versatile enough for CNC set-ups.

Key Features

• Plug style: Designed for use in thru holes, the plug geometry balances cutting with strength for general-purpose threading.
• High Speed Steel construction: Provides a hard, sharp cutting edge suitable for both hand use and tapping under power without relying on coatings.
• Uncoated tool: The bare HSS substrate suits a wide range of materials and applications where coating is not required.
• Thread restoration: Useful for re-threading damaged or jammed threads as well as cutting new threads in workpieces.
• Compatibility: Commonly used in general machine tapping and CNC tapping workflows where a single high-quality plug tap is needed.

Who It's For

The Drill America 1-1/4'-12 UNF plug tap is aimed at machine shop users, maintenance techs, and experienced DIYers who frequently cut or repair UNF threads in thru holes and want a straightforward HSS tap for hand or light power tapping. Its uncoated design and plug profile make it especially useful on softer metals like aluminum and for situations where coating could interfere with fit or subsequent treatments.

Those who require extreme durability in hardened steels or who need a complete set for tapered starts or bottoming to reach thread bottoms should look elsewhere or pair this tap with the matching taper and bottom taps. Also, novices should be cautious: users reported occasional breakage when taps were pushed beyond intended limits, so proper technique and tapping lubricant are important.

Pros & Cons

Pros

• Sharp HSS cutting edge that produces clean threads, especially in aluminum and mild steel.
• Plug style is versatile for most thru-hole threading tasks and general machine use.
• Uncoated finish means predictable performance across a variety of materials.

Cons

• Some users reported durability concerns, including breakage in demanding applications or hardened materials.

Specifications

Brand	Drill America
Type	Plug tap (HSS)
Size	1-1/4'-12 UNF
Material	High Speed Steel (uncoated)
Intended use	New threads and re-threading; thru holes
Pack quantity	Pack of 1

Our Verdict

The Drill America 1-1/4'-12 UNF HSS plug tap is a sensible, value-oriented choice for users who need a sharp, reliable tap for thru-hole UNF threading and re-threading in common shop materials. It delivers clean thread cuts and works well for hand or machine tapping, but buyers should match tool choice and technique to material hardness to avoid breakage.

Frequently Asked Questions

Is this tap suitable for hardened steel?
Answer. It is HSS and uncoated, so it can cut many materials but may not be ideal for very hardened steels where specialized taps or coatings are recommended.

Can this tap be used in a drill press or CNC machine?
Answer. Yes, the tap is suitable for light power tapping and CNC tapping when used with proper feeds and speeds and rigid setup.

Does this pack include taper and bottom taps?
Answer. No, this listing is a single plug tap; a full set normally contains one taper, one plug and one bottoming tap.