Short machine taps and hand taps

Short machine taps and hand taps

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1   Scope

This document specifies the general dimensions of short machine taps and hand taps. These dimensions, established as functions of the thread diameter and pitch, are the following:
  • — length of thread (maximum);
  • — overall length;
  • — shank diameter and dimensions of driving square;
  • — dimensions of the connecting portion between the shank and threaded part.
This document is applicable to taps intended for cutting the following threads:
  1. a) ISO metric threads:
    • — coarse pitch;
    • — fine pitch;
  2. b) ISO inch threads:
    • — “Unified Coarse” series (UNC) and “Unified Fine” series (UNF);
  3. c) Inch threads, non-recommended:
    • — “British Standard Whitworth” (BSW) and “British Standard Fine” (BSF);
    • — “British Association” (BA).

NOTE 1 The overall length, thread length and diameters of shank for taps whose thread diameter and pitch are not listed in tables are given in Table A.1a.

NOTE 2 Annex B gives an abstract from ISO 237 for shank diameters and size of driving squares, for information.

NOTE 3 Technical specifications for taps covered by this document (including marking) are given in ISO 8830.