DIN 138
金属切削工具 - 具有圆柱形孔和1:30锥形孔的工具的孔、键槽和驱动特征
Metal-cutting tools — Bores, keyways and driving features for tools with parallel bore and 1 in 30 taper bore
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Metal-cutting tools — Bores, keyways and driving features for tools with parallel bore and 1 in 30 taper bore