This standard specifies hexagon socket set screws with flat ends with thread specifications M1.6~M24, performance grades 45H, A1, A2, CU2, CU3 and AL4, and product grade A. If other technical requirements are required, they should be selected from current standards (such as GB/T 196, GB/T 3106, GB/T 3098.3).
GB/T 77-2000 history
2007GB/T 77-2007 Hexagon socket set screws with flat point
2000GB/T 77-2000 Hexagon socket set screws with flat point