GB/T 13916-2002 in English

《GB/T 13916-2002冲压件形状和位置未注公差》由TC74（全国锻压标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了金属冲压件的直线度、平面度、同轴度、对称度、圆度、圆柱度、平行度、垂直度、倾斜度的未注公差等级和数值。本标准适用于金属板材冲压件。

Unnoted tolerance of shape and position for stampings

1 Scope

This standard specifies the grades and values of unnoted tolerances for straightness, flatness, coaxiality, symmetry, roundness, cylindricity, parallelism, perpendicularity and inclination of metal stampings.

This standard is applicable to metal sheet stampings.

2 Grades of tolerances

There are five grades of tolerances for straightness and flatness of stampings, and four for coaxiality and symmetry.

3 Values of tolerances

3.1 Unnoted tolerances for straightness and flatness

The values of unnoted tolerances for straightness and flatness shall be as specified in Table 1, and values obtained from relatively long edges shall be chosen as the main parameters in terms of unnoted tolerances for flatness. Examples for selection of main parameters L, D and H are shown in Figure 1.

Foreword i
1 Scope
2 Grades of tolerances
3 Values of tolerances