中华人民共和国国家标准
NATIONAL
STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 7306.1-2000
Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads--Part 1:Parallel internal and taper external threads 55°密封管螺纹 第1部分:圆柱内螺纹与圆锥外螺纹
Issued Date:2000-07-24
Implemented Date:2000-12-01
Issued by:
The Standardization Administration of the People's Republic of China