HSS Machine & Fractional Hand Taps, Special Sizes

Shop special-size high-speed steel (HSS) machine screw and fractional hand taps for cutting internal threads in metal. These taps are designed for applications requiring uncommon thread diameters or pitches, including machinery maintenance, metal fabrication, and specialized repair work.

Select the correct thread diameter, threads per inch (TPI), and tap style for your application. Need help finding the matching drill bit? Use our Special Tap and Drill Size Calculator or Tap and Drill Chart. You can also browse our Hand Tap and Drill Sets for available matched combinations.