These British manufactured Carbon Steel Cut 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 and select the O.D.(Outside Diameter)for the die from the letter list. F = 2-1/4" (1"-Only) G = 3" (1" - 1-1/4") H = 4" (1-1/2" - 2") Please Note: 1-3/4"x5TPI & 2"x4 1/2TPI will be MARKED as UNS not UNC.
N.P.T. Carbon Steel Solid Die (1"-2")
- 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.