Dimensional Tolerance Of Stamping Parts

Dimensional tolerance of stamping parts is specified in GB/T13914-2002 Dimensional Tolerance of Stamping Parts. The dimensional tolerance is specified according to the flat stamping parts and the formed stamping parts. The dimension tolerance value of stamping parts is related to the dimensions of stamping parts and plate thickness, on the other hand, it is related to the accuracy level.
Dimensional tolerance of flat stamping parts: it is divided into 11 grades, represented by ST1 to ST11, where ST represents the dimensional tolerance of flat stamping parts, and the tolerance grade code is represented by Arabic numerals. The accuracy level decreases from ST1 to ST11.
Dimensional tolerance of formed stampings: formed stampings are divided into 10 accuracy grades, expressed by FT1 to FT10, where FT represents dimensional tolerance of formed stampings, and Arabic numerals represent tolerance grades. The accuracy level decreases from FT1 to FT10.
Limit deviation of stamping parts: the lower deviation of hole size is 0, and the upper deviation is the lower deviation plus dimension tolerance; The upper deviation of shaft dimension is the basic deviation, and the value is 0. The lower deviation is the upper deviation minus the dimension tolerance. For hole center distance, hole edge distance, bending, drawing length, height and other upper and lower deviations are specified as half of the dimensional tolerance.