Standard No.:	GB/T 39641-2020
English Name:	Methods for gaging fastening screw threads by thread indicating gages
Chinese Name:	螺纹指示量规检测紧固螺纹方法
Chinese Classification:	J04    Basic standards and general methods
Professional Classification:	GB    National Standard
ICS Classification:	21.040.01 21.040.01    Screw threads in general 21.040.01
Source Content Issued by:	SAMR; SAC
Issued on:	2020-12-14
Implemented on:	2021-7-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	21000 words
Translation Price(USD):	630.0
Delivery:	via email in 1~5 business day

本标准规定了螺纹指示量规检测紧固螺纹参数的方法。紧固螺纹参数包括：作用中径、基本牙型底径、设计牙型底径、中径、单一中径、径向中径差、轴向中径差、螺距（导程）、牙侧角、牙型综合偏差、顶径相对中径跳动。
本标准适用于紧固螺纹参数的检测（内、外螺纹的最小公称直径分别为4.8 mm和1 mm）。