Half round head protective cap - single nut (inner and outer hexagon) DIN934,DIN555,DIN970,ISO4032,ISO4033,ISO4034,GB52,GB51,ASME/ANSI B18.2.2,ASME/ANSI B18.2.2,ASME/ANSI B18.2.6

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Hexagonal flange head protective cover (hexagonal flat head/round head/hexagonal flat head+round head) GB5787,DIN6921,ISO4162,GB5789,DIN6922,GB5788,GB16674.3,GB35481,DIN34801,DIN34800,DIN7504,DIN571

Outer round inner hexagonal protective cap