China 'GB/T 22091.1-2008
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 22091.1-2008
Gauges for pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1:Verification of parallel internal and taper external threads 55°密封管螺纹量规 第1部分:用于检验圆柱内螺纹与圆锥外螺纹
Issued Date:2008-06-25
Implemented Date:2009-01-01
Issued by:
The Standardization Administration of the People's Republic of China