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Roll taps form threads through material deformation, 
so there are no chips to interfere with the tapping process.
Cut taps form threads by cutting the material, creating chips that can clog 
flutes or collect in blind holes.
Roll/Form Taps 
Roll taps, or form taps, unlike conventional cutting taps, form threads 
through material deformation, rather than by cutting the material. As a 
result, no chips are produced in the process. Since there are no chips to 
interfere with the tapping process, roll taps produce stronger, cleaner 
threads, with excellent surface finish. And since there are no chips to clog 
flutes or collect in blind holes, there’s less chance of tap breakage.
Roll taps require a larger drill than a cutting tap of the same size, to allow 
room for the material to flow when creating the threads. The grain flow of 
the material follows the contour of the formed thread, creating a stronger 
thread, especially in materials that work harden, like steel and stainless. 
Generally, roll taps can be run at higher speeds and feeds than cutting taps, 
and have a significantly longer tool life. They are well suited for smaller 
holes, and materials that require a stronger tap.
Pipe Taps 
Pipe Taps are high-speed cutting tools that are used to cut internal threads 
in pipes or pipe fittings that will provide an effective seal when mated with 
the appropriate component. When mated, pipe threads form a pressure-
tight seal that allows the flow of liquids, gases, steam, and hydraulic fluid, 
without leaking.
Haas offers various types of pipe thread taps that are designed to form a 
seal with or without thread sealants. 
NPT/NPS and BSPT/BSPP threads are not compatible, due to 
differing thread pitches. Moreover, NPT/NPS threads follow the 
Sellers Standard thread form, which has flattened peaks and 
valleys, as well as a 60° thread angle. BSPT/BSPP threads follow 
the Whitworth thread form, which has a 55° thread angle, and 
rounded peaks and valleys.
High-value general-purpose tap 
I can’t verify the exact tolerance on the threads, which may be critical to some 
shops, but for my own use, they cut clean threads and I’ve not broken one yet, 
which is great in comparison to some of the cheap taps I’ve used in the past.  
1/2-20 SP PT MULTIPLE MATERIAL TAP
Ken Stauver | 02/09/2021
ISO MATERIAL TYPE	
                              TiCN COATING
P - STEEL
●
M - STAINLESS STEEL
●
K - CAST IRON
—
N - NON-FERROUS
●
S - HIGH-TEMP ALLOYS
—
H - HARDENED METALS
—
Haas roll taps are constructed of HSS PM powder metal high-speed 
steel, with a high content of vanadium and cobalt, for high-speed 
tapping and excellent wear resistance. These taps feature a 
Titanium Carbonitride (TiCN) coating, which offers improved wear 
and resistance to built-up edge. TiCN has good adhesion, toughness, 
and resistance to chipping, and performs well where moderate 
temperatures are generated at the cutting edge. They are well 
suited for tapping in steel, stainless steel, and 
non-ferrous materials.

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