GB/T 9074.12-1988
Cross recessed hexagon head bolt with indentation and spring washer assemblies
GB/T 9074.13-1988
Cross recessed hexagon head bolt with indentation , spring and plain washer assemblies
GB/T 9074.13G-1988
Cross recessed hexagon head bolt with indentation , spring and large plain washer assemblies
GB/T 9074.17-1988
Hexagon head bolt, spring and plain washer assemblies
GB/T 9074.15-1988
Hexagon head bolts and spring washer assemblies