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")
- 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.