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Tap Extensions
Self-Locking Tap Extension: Inch, Metric, NPT

Tap Extensions - For use with Inch, Metric & NPT Taps

Unique self-locking feature offers the smallest OD of any Tap Extension in the industry and the ideal solution for close quarter & long tapping problems.  No set screws or collets required!

Each extension is designed for a specific tap size.  The tap shank and tap square dimensions conform to the size standards of leading tap manufacturers.  Because the Tap Extension has no set screws or collars which extend shaft diameter, it offers unique capabilities in allowing the user to tap close to the edge or shoulder of the workpiece.

How does it work?

The secret to the Tap Extensions unique self-locking design is a precision machined EDM cavity that receives the end of a standard tap.  The bottom part of the cavity (A) is a tapered square with a wall angle of less than one degree, which receives the square section of the tap and grips it so securely that a thin drift is needed to separate the tap and extension.  The cylindrical part of the tap shank fits tightly into a similar cavity in the extension (B), providing resistance to bending.

Diagram: Tap and Extension

Simple Product Set-Up:

  • Verify that your Tap's Shank and Square dimensions are within the acceptable ranges for the Extension.  Reference: Machine Taps, Pipe Taps
  • Line up the Tap square corners with the Extension inner marks - See more at: up the
    Line up the Tap Square corners with the Extension inner marks.  Tap the Square of the Extension with a soft (brass/lead) hammer or block to seat the Tap firmly.
  • Square of Tap should be visible in the slot window.
  • To dislodge Tap from Extension, insert the supplied drift key and tap with hammer.
  • Click on the following links to view any of the featured video demonstrations: Hand Tap, Drill Press, CNC Machine
American Made Quality & Value

Each Self-Locking Tap Extension is precision machined from high quality tool steel and guaranteed against defects in material or workmanship.  Extensions offer all the benefits of a long tap, yet at the cost associated with a standard tap.

Click on one of the links below to view size, length and pricing!
Inch and Metric
Inch and Metric
The Machine Tap Series offers Extensions for Tap Sizes ranging from #0-6 to 1-1/4" in diameter or M2.2 to M30 metric equivalent. Each size offers four extension lengths ranging from 2" to 12".
The Pipe Tap Series offers Extensions for Tap Sizes ranging from 1/16" NPT to 1-1/2" NPT in diameter. Each size offers four extension lengths ranging from 4" to 12".

"All items are in stock - ship same day by 3pm CST"