This standard specifies the basic profile and design profile of zigzag threads with flank angles of 3° and 30°. This standard applies to serrated threads for general purposes.
GB/T 13576.1-1992 history
2008GB/T 13576.1-2008 Buttress threads with the flank angles of 3 and 30 degrees.Part 1:Profiles
1992GB/T 13576.1-1992 Buttress threads with 3 and 30 degrese flank flank angle--Profiles