This standard specifies all-metal hexagon flange lock nuts with thread specifications M5-M20, performance grades 8, 9, 10 and 12, and product grades A and B. Grade A is used for D≤16mm; Grade B is used for nuts with D>16mm. For the inspection of hexagon and flange, see Appendix A (standard appendix). Note: This kind of nut is equivalent to GB/T 6177.1 plus the effective torque part. If other technical requirements are required, they should be selected from current standards (such as GB/T 196, GB/T 3098.9 and GB/T 3103.1).
GB/T 6187.1-2000 history
2016GB/T 6187.1-2016 Prevailing torque type all-metal hexagon nuts with flange, style 2
2000GB/T 6187.1-2000 Prevailing torque type all-metal hexagon nuts with flange