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  • BS 3409-1(1961) : 1961

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    SPECIFICATION FOR THE TAPPING OF HOLES TO RECEIVE WIRE THREAD INSERTS (UNC AND UNF THREADS) - DIAMETERS 1/4 IN AND OVER

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  01-01-1961

    Publisher:  British Standards Institution

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

    Co-operating organizations
    Foreword
    1 Scope
    Section 1 - Tapped holes
    2 Form of thread and limits of size
    3 Identification
    Section 2 - Screwing taps
    4 General dimensions
    5 Marking
    6 Form of thread
    7 Limits of size for cutting diameter
    Section 3 - Gauging system
    8 General
    9 Design and general dimensions
    10 Tolerances and limits of size

    Abstract - (Show below) - (Hide below)

    Contains three sections: Section 1, which specifies limits of size for tapped holes to accommodate wire thread inserts to provide thread sizes from [1/4] in to 1[1/2] in UNC inclusive and from [1/4] in to 1 in UNF inclusive; Section 2, which recommends screwing taps intended to produce holes to the limits of size specified in Section 1; Section 3, which gives a recommended gauging system for checking the tapped holes.

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    Committee 45
    Development Note Reviewed and confirmed by BSI, March 2013. (03/2013)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
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