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BS ISO 2284:2017 pdf free

BS ISO 2284:2017 pdf free.Hand taps for parallel and taper pipe threads – General dimensions and marking
This document specifies the general dimensions and marking of hand taps for pipe threads.
It is applicable to the two following types of tap:
一taps for parallel threads (see Figure 1 and Table 1),
一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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 237, Rotating tools with parallel shanks一Diameters of shanks and sizes of driving squares
ISO 5969, Ground thread taps for pipe threads G series and Rp series一Tolerances on the threaded portion
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
一 IEC Electropedia: available at http://www.electropedia.org/
一ISO Online browsing platform: available at htp://www.iso.org/obp
4 General dimensions
The general dimensions are given in Table 1 and Table 2.
Shank diameters and driving squares shall conform to the specifications given in ISO 237, the tolerances being as follows:
一on diameter, d1: h9 for precision shanks; h11 for other shanks;
一on width across flats, a: h11; h12 (including errors of form of the square and of its position in relation to the shank).
5 Marking
Taps in accordance with this document and with the requirements of ISO 5969 shall be marked, on the shank, with the following indications:
a) the letter designating the thread series;
b) the designation of the thread.
Where tools comply in all respects with the relevant International Standards, the symbol ISO may be appended to the mark at the discretion of the manufacturer.BS ISO 2284 pdf download.

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