中华人民共和国国家标准
NATIONAL
STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 7631.4-1989
Lubricants and related products (class L)--Classification--Part 4:Family F (Spindlebearings,bearings and associated clutches) 润滑剂和有关产品(L类)的分类 第4 部分:F组 (主轴、轴承和有关离合器)
Issued Date:1989-03-31
Implemented Date:1990-04-01
Issued by:
The Standardization Administration of the People's Republic of China