ISO 2284:2017 specifies the general dimensions and marking of hand taps for pipe threads.
It is applicable to the two following types of tap:
- taps for parallel threads (see Figure 1 and Table 1),
- taps for taper threads (see Figure 2 and Table 2),
having threads in accordance with ISO 7‑1 and ISO 228‑1.
Furthermore, it gives in Annex A the bases used for calculation of the dimensions, and in Annex B the relationship between designations in this document and the ISO 13399 series.