This standard specifies the basic type of the tool spindle end of spiral bevel gear milling machines, the dimensions and technical requirements for connection with the tool. This standard applies to the end of the tool spindle of spiral bevel gear milling machines with a maximum workpiece diameter of 120 mm ~ 1 600 mm, the end of the tool spindle of spiral bevel gear broaching machines, as well as cutterhead sharpening machines, cutterhead grooving machines and The end of the spindle of cutterhead inspection machines, etc. can also be used with reference to this standard (hereinafter referred to as "machine tools").