GB/T 2516-2023 (English Version)

Standard No.: GB/T 2516-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 2516-2023
Replace: GB/T 2516-2003

Scope: This document specifies the limit deviations of the middle diameter and top diameter of ordinary threads (M). The basic tooth type and diameter and thread series of ordinary threads comply with the provisions of GBMT192 and GB/T193 respectively, and the basic deviation and tolerance comply with the provisions of GB/T197. This document is applicable to ordinary threads using recommended tolerance zones.

Introduction

Background of Standard Revision and Technological Evolution

GB/T 2516-2023, as a core component of the national standard system for ordinary threads, replaces the 2003 version of the standard. This revision simultaneously adopts the ISO 965-3:2021 international standard. The main technical changes include:

Revision content	2003 edition	2023 edition
External thread tolerance zone	6 types	4g, 5g4g and other 4 types, a total of 10 types
Stress calculation item	Retain the basic deviation of the minor diameter of the external thread	Delete this calculation parameter

Interpretation of core parameters

The standard stipulates Ordinary threadThe limit deviations of the middle diameter and top diameter, the key points include:

Application case: When the 6g tolerance zone is selected for M12×1.75 thread, the limit deviation of the middle diameter is -18μm~-71μm, and the major diameter deviation is -18μm~-85μm

Tolerance Zone Selection Guide

Accuracy grade	Internal thread tolerance zone	External thread tolerance zone	Applicable scenarios
Precision	4H/5H	4h/5h4h	Instruments and meters
Medium	6H	6g/6e	General Machinery

Implementation Suggestions

1. Coating and plating process control: The standard clearly states that the thread should meet the tolerance band requirements before coating and plating, and the profile after plating shall not exceed the maximum solid tooth profile determined by H/h
2. Inspection points: It is recommended to use thread comprehensive gauge with three-needle method to measure the middle diameter
3. Transition from old to new: Starting from June 1, 2024, new designs must adopt the 2023 version of the standard

GB/T 2516-2023 Referenced Document

GB/T 14791 Screw threads.Vocabulary

GB/T 2516-2023 history

2023 GB/T 2516-2023 Ordinary thread limit deviation
2003 GB/T 2516-2003 General purpose metric screw threads--Limit deviations
0000年 GB/T 2516-1981