GBT1804-92标准（英文版）.doc

National Standard of the People’s Republic of China
General tolerance GB/T 1804-92
Tolerance for linear dimensions
without individual tolerance indications replaces GB 1804-79
This standard adopts the part “Tolerance for linear dimensions without individual tolerance indications” of international standard ISO 2768-1: 1989 General tolerance – Part I: Tolerances for linear and angular dimensions without individual tolerance indications.
Theme content and scope
This standard specifies the general tolerance grad and limit deviation for linear tolerance.
This standard is applicable to metal cutting dimensions and general pressing dimensions. Dimensions of nonmetal material and other process manufacturing method can refer to this standard.
The limit deviation specified in this standard is applied to non fit dimensions.
General tolerance concept
General tolerance refers to the tolerance which can be guaranteed in the workshop under the normal manufacturing conditions. The dimensions with general tolerance need not mark limit deviation.
General tolerance for linear dimensions
. Normally the general tolerance for linear dimensions specifies four tolerance grades. Limit deviation value of linear dimension please see Table 1; limit deviation of fillet radius and chamfer height dimensions please see Table 2.
. In order to specify the linear dimensions without individua