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Composite bolt GB9074.13 refers to cross the outer hexagonal screws, bolt also called combination. Have called cross trough recesses combination hexagonal head bolt. Refers to a bolt which is outer hexagonal screws, bolt is a cross. With a spring washers in a flat pad assembly. GB9074.13-1988 refers to the outer hexagonal screws of the specifications of the standard is stipulated by 1988. It is also called cross trough recesses hex bolt, spring washer peace washer assemblies. 
