North American Tool offers a full line of threading dies and adapters, which complement their line of popular special and full special taps.

While the process of cutting threads using a tap is called tapping, the process using a die is called threading. Both tools can be used to clean up a thread, which is called chasing.

Accordingly, a tap is used to cut the female portion of a mating pair, and a threading die is used to cut the male portion.  A die cuts a thread on a preformed cylindrical rod, which creates a male-threaded piece, functioning like a bolt.

  • Popular special round adjustable dies in sizes from #5-40 NC through 2″-20 NS with O.D.’s 13/16”, 1”,1-1/2”, 2”, 2-1/2”, 3”. Include pipe (NPT/NPS) sizes and Whitworth pipe full form (BSPT/BSPP) sizes.
  • Metric sizes from M3 X 0.5 through M39 X 4.0 with O.D.’s 20.6mm, 25.4mm, 38.1mm, 50.8mm, 63.5mm, 76.2mm.
  • Special round adjustable dies from #4 through 2″; and M3 through M48 (OD’s from 1″ through 3″).
  • Hex dies from 1/4″ through 3-1/2″ (including .969”-32 N-05 Locknut Hex Dies); Metric hex dies from M6 through M88.
  • Hex adapters are available.
  • For full specials, consult North American Tool Customer Service Dept.
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