These British manufactured High Speed Steel Ground Threading Dies have a machined lead-in for ease of use and accurate thread cutting.

Please make your size selection from the drop down menu. 

Die O.D.  Thread Size Range

1"         (1/8" Only)
1-5/16"    (1/8"-1/4")
1-1/2"     (1/4"-3/8")
2"         (1/4"-3/4")
2-1/4"     (1" Only)
3"         (1"-1-1/4")
4"         (1-1/4"-2")

N.P.T. High Speed Steel Solid Die (1/8"-3/4")

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  • Tap Types: First Taper (or Taper Tap) A Taper Tap has a pronounced taper to the cutting edges. This feature gives the taper tap a very gradual cutting action that is less aggressive than that of the plug tap. The number of tapered threads typically ranges from 8 to 10. A taper tap is most often used when the material to be tapped is difficult to work (e.g., alloy steel) or the tap is of a very small diameter and thus prone to breakage. Second Taper (or Intermediate Taper) A Second Taper tap has tapered cutting edges, which assist in aligning and starting the tap into an untapped hole. The number of tapered threads typically ranges from 3 to 5 and is the most common type of threading tap used. Plug/Cleaning Tap (or Bottom Tap) A Plug tap has a continuous cutting edge with almost no taper — between 1 and 1.5 threads of taper. This feature enables a bottoming tap to cut threads to the bottom of a blind hole. A bottoming tap is usually used to cut threads in a hole that has already been partially threaded using one of the more tapered types of tap or for cleaning out dirty threads; the tapered end of a plug tap is too short to successfully start and cut new threads in an unthreaded hole.