⒈File body: the part contained between the tip of the file and the shoulder of the file is the file body. For a plastic file without a shoulder, the file body refers to the part with file lines.

⒉File handle: the part other than the file body.

⒊The parallel part of the file body: the part where the generatrix of the file body is parallel to each other is the file body parallel part.

⒋ Tip: the part between the starting point and the tip where the cross-sectional size of the file body begins to gradually decrease. (Length of the file body = tip length + parallel part of the file body)

⒌Main file pattern: The file pattern that plays the main cutting role on the working surface of the file is the main file pattern.

6. Auxiliary file pattern: The file pattern covered by the main file pattern is the auxiliary file pattern.

⒎Edge file pattern: the file pattern on the narrow or narrow side of the file is the edge file pattern.

⒏Main (auxiliary) file bevel angle λ (ω): The acute angle between the main (auxiliary) file and the axis of the file body is the main (auxiliary) file bevel λ (ω).

⒐Edge filing angle θ: 　The acute angle between the edge filing pattern and the axis of the file body is the edge filing angle θ.

⒑ Number of file lines: The number of file lines per 10mm length in the axial direction of the file is the number of file lines.

⒒ File tooth bottom line: On the normal vertical section of the main file pattern, the straight line passing through the two adjacent tooth bottoms is the tooth bottom line.

⒓Tooth height: The distance between the top of the tooth and the bottom of the tooth is the tooth height.

⒔Tooth rake angle: the rake angle of the tooth is the sharp angle between the intersection of the cutting edge surface and the normal surface of the file tooth relative to the vertical line connecting the tooth bottom.