GB/T 12617-1990

This standard specifies the dimensional, mechanical, and performance requirements for 120-degree flush head break mandrel blind rivets, which are designed for single-sided fastening applications where a flush surface is required. It is primarily applied in the assembly of thin sheet materials in industries such as automotive manufacturing, aerospace, electronics enclosures, and general metal fabrication, where access is limited to one side of the workpiece. The standard ensures consistent rivet strength, head geometry, and mandrel break load for reliable joint integrity in structural and non-structural connections.