Standard No.:	GB/T 34632-2017
English Name:	The blank diameters for rolling unified screw threads
Chinese Name:	统一螺纹搓制和滚制前的毛坯直径
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
Issued by:	AQSIQ; SAC
Issued on:	2017-10-14
Implemented on:	2018-5-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	5500 words
Price(USD):	160.00
Delivery:	via email in 1~3 business day

本标准规定了统一螺纹搓制和滚制前的毛坯直径尺寸。统一螺纹公称直径范围为0.0600 in~ 2.0000 in（1/4 in以后只有第1系列直径；牙数系列有UNC、UNF、UNEF、8UN、12UN和16UN六种，最少牙数为6牙）；螺纹公差带有2A和3A两种。统一螺纹的牙型、直径与牙数系列和公差分别符合GB/T 20669、GB/T 20670和GB/T 20666的规定。
本标准适用于全牙型挤压工艺加工碳素钢和合金钢材料的统一螺纹。