本规范适用于手动牙髓Hedstrom锉，其工作部分锥度仅为牙髓准备或成形操作中使用的2%（0.02毫米/毫米长）。

This specification is for endodontic Hedstrom files for hand use only having a working part taper of 2% (0.02 millimeter per millimeter of length) as used in endodontic preparation or shaping operations.