GB/T 192-2025 General purpose metric screw threads — Profiles
1 Scope
This document specifies the basic and design profiles for general purpose metric screw threads (M).
This document is applicable to the metric fastening screw threads.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 192-2025 General purpose metric screw threads — Profiles
1 Scope
This document specifies the basic and design profiles for general purpose metric screw threads (M).
This document is applicable to the metric fastening screw threads.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 purpose of this document, the terms and definitions given 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
d1: minor diameter of external thread on basic profile
d3: minor diameter of external thread on design profile
P: pitch
H: fundamental triangle height
H1: thread height of internal thread, and thread height of external thread on basic profile
h3: thread height of external thread on design profile
R: full root radius of external thread on design profile
R1: radius on root corners of external thread on design profile
Contents of GB/T 192-2025
Contents
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Basic profile
6 Design profile
