This standard specifies the types and dimensions of symmetrical double-angle milling cutters. This standard applies to symmetrical double-angle milling cutters with an outer diameter of 50 to 100 mm.
GB/T 6128.3-1996 history
2007GB/T 6128.2-2007 Angle milling cutter Part 2: The double equal-angle cutters
1996GB/T 6128.3-1996 Angle milling cutter--Part 3: The types and dimensions for double equal-angle cutters
GB/T 6128.3-1996 Angle milling cutter--Part 3: The types and dimensions for double equal-angle cutters was changed to GB/T 6128.2-2007 Angle milling cutter Part 2: The double equal-angle cutters.