标准编号：ISO 2540:2016
中文名称：钻中心孔用有保护槽中心孔的中心钻 B型
英文名称：Centre drills for centre holes with protecting chamfer — Type B
发布日期：2016-11
标准范围
This International Standard specifies the dimensions of centre drills for centre holes with protecting chamfer — Type B.It covers only metric dimensions, regarded as the only recommended dimensions in the future for this type of drills.The flutes can be straight or spiral at the option of manufacturer.Unless otherwise stated, these drills are right-hand cutting.Annex A gives the recommended dimensions for the centre holes, Type B, which can be obtained by a rational use of the centre drills listed in this International Standard.
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