1. Scope
This Japanese Industrial Standard specifies the carbon steel tubes, hereinafter referred to as the "tubes", used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.
Remark
 1. The units and numerical values given in { }in this Standard are based on the International System of Units (SI) and are appended for informatibe reference.
        2. Further, the traditional units accompanied by numerical values in this Standard shall be converted to the SI units and numerical values on January 1. 1991.   

2. Grade and Designation
The grade and designation of the tube shall be as given in Table 1.
The subclassification letter symbols A, B and C are used to indicate distinction of method of manufacturing the tube, cold working process, heat treatment, etc.