This standard specifies the types and dimensions of straight shank twist drills. This standard applies to straight shank twist drills with a diameter of 0.20 mm to 20.00 mm.
GB/T 6135.3-1996 history
2008GB/T 6135.2-2008 Parallel shank twist drills.Part 2: The types and dimensions for parallel shank stub series twist drills and parallel shank jobber series twist drills
1996GB/T 6135.3-1996 Parallel shank twist drills--Part 3: The types and dimensions for parallel shank jobber series twist drills
GB/T 6135.3-1996 Parallel shank twist drills--Part 3: The types and dimensions for parallel shank jobber series twist drills was changed to GB/T 6135.2-2008 Parallel shank twist drills.Part 2: The types and dimensions for parallel shank stub series twist drills and parallel shank jobber series twist drills.