GB/T 196-2025 General purpose metric screw threads - Basic dimensions English
1 Scope
This document specifies the basic dimensions of general purpose metric screw threads according to the design profiles of GB/T 192 and the dimeter and pitch series of GB/T 193.
This document is applicable to the metric fastening screw threads.
2 Normative references
The following referenced documents are indispensable for the application 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.
GB/T 14791 Screw threads - Vocabulary (GB/T 14791-2013, ISO 5408:2009, IDT)
3 Terms and definitions
For the purposes of this standard, the terms defined in GB/T 14791 apply.
4 Symbols
For the purposes of this document, the following symbols apply.
D major diameter of internal thread (nominal diameter)
d major diameter of external thread (nominal diameter)
D2 pitch diameter of internal thread
d2 pitch diameter of external thread
D1 minor diameter of internal thread
d3 minor diameter of external thread on design profile
P pitch
H fundamental triangle height
H1 thread height of internal thread on design profile
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Basic dimensions
Bibliography
