This standard stipulates the tolerances of zigzag threads whose tooth type conforms to GB/T13576.1, and whose diameter and pitch conform to GB/T13576.2. This standard applies to serrated threads for general purposes.
GB/T 13576.4-1992 history
2008GB/T 13576.4-2008 Buttress threads with the flank angles of 3 and 30 degrees.Part 4:Tolerances
1992GB/T 13576.4-1992 Buttress threads with 3 and 30 degrees flank angle-Tolerances