GB/T 3464-2025 Machine and hand taps

Scope

This document specifies the general dimensions, markings, thread profiles, basic dimensions and tolerances, technical requirements, and supply conditions for machine and hand taps, and describes the testing methods for machine and hand taps. This document applies to the manufacture of taps for ordinary threads, unified threads, and Whistler threads. Note 1: For taps whose thread diameters and pitches are not listed in the table, see Table A.1 in Appendix A for their total length, thread length, and shank diameter. Note 2: Appendix B provides a summary of the shank diameter and drive square head dimensions in GB/T 4267. Note 3: The relationship between the designations in this document and the symbols in ISO 13399 (all parts) is shown in Appendix C. Note 4: General dimensions are determined based on the thread diameter and pitch, including: the length of the threaded portion (maximum value), total length, shank diameter, square head dimensions, and the dimensions of the connection between the shank and the threaded portion (neck).

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