This standard specifies the types, dimensions and measuring methods of hexalobular sockets for bolts and screws. The size of the hexagonal socket is determined by the gauge, which should be specified in Table 3 to Table 5. When drawing profile curves, reference materials are given in Appendix A (reminder appendix). In order to check the needs of the hexagonal socket, this standard gives detailed drawings, but it is not applicable to manufacturing standards.
GB/T 6188-2000 history
2017GB/T 6188-2017 Hexalobular internal driving feature for bolts and screws
2009GB/T 6188-2008 Hexalobular sockets for bolts and screws
2000GB/T 6188-2000 Hexalobular internal driving feature for bolts and screws