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  • EN 22857:1989

    Current The latest, up-to-date edition.

    Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches - Manufacturing tolerances on the threaded portion (ISO 2857:1973 + A1:1984 +A2:1986)

    Available format(s): 

    Language(s): 

    Published date:  28-09-1989

    Publisher:  Comite Europeen de Normalisation

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    Table of Contents - (Show below) - (Hide below)

    1 Scope and field of application
    2 References
    3 Basic data
      3.1 Thread profile of nuts
      3.2 Thread profile of tap
      3.3 Tolerance classes of taps
      3.4 Calculation of tap thread dimensions of
          classes 1,2 and 3
    4 Manufacturing tolerances on tap threads
      4.1 Major diameter d
      4.2 Pitch diameter d[2]
      4.3 Minor diameter of tap d[1]
      4.4 Tolerance on the angle alpha and half angle
          alpha/2 of thread
      4.5 Cumulative pitch error T[p] over any number of threads
    5 Designation and marking of taps
    6 Example of calculation of the dimensions of the threaded
      portion of a tap
    Annex A - Ground thread taps for ISO metric threads of coarse pitch
    Annex B - Ground thread taps for ISO metric threads of fine pitch

    Abstract - (Show below) - (Hide below)

    Is valid for the short taps specified in ISO 529 as well as for any other kind of ground thread taps with the same diameters and pitches. The internal threads produced with those taps are conventionally designated by the simplified denomination of "nut" in agreement with the word used in ISO 965 for the general designation of all internal threads.

    General Product Information - (Show below) - (Hide below)

    Committee CEN/BT
    Development Note Also numbered as BS 949-4(1990) and ISO 2857. (10/2005)
    Document Type Standard
    Publisher Comite Europeen de Normalisation
    Status Current

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 724:1993 ISO general-purpose metric screw threads — Basic dimensions
    ISO 965-2:1998 ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general purpose external and internal screw threads — Medium quality
    ISO 529:2017 Short machine taps and hand taps
    ISO 965-1:2013 ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data
    ISO 965-3:1998 ISO general purpose metric screw threads Tolerances Part 3: Deviations for constructional screw threads
    View more information

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