1. According to the purpose, there are: ordinary fitter file, which is used for general filing processing; Wood file, used to file soft materials such as wood and leather; Plastic file (Shijin file), which is used to file small and fine metal parts, consists of a set of files with various cross-section shapes; Sharpening files for woodworking saws; Special files, such as flat and bow shaped special-shaped files (special files) with special shapes, can be divided into straight and curved files.
2. Files are divided into flat files (flat files), square files, semicircular files, round files, triangular files, diamond files and knife files according to the profile shape. Flat files are used to file flat, cylindrical and convex curved surfaces; Square files are used to file square holes, rectangular holes and narrow planes; Triangular file is used to file internal corners, triangular holes and planes; Semicircular file is used to file concave cambered surface and plane; Round file is used to file round holes, concave arc surfaces and elliptical surfaces with small radius.
3. Files are divided into single grain files and double grain files according to the file pattern. The teeth of the single file are inclined at an angle to the axis, which is suitable for processing soft non-ferrous metals; The main and auxiliary file lines of the double grain file are arranged alternately, which is used for processing steel and non-ferrous metals. It can divide the wide file into many small sections, making the file lighter and faster.
