A head with no markings is grade 2, one with 3 lines spaced 120 degrees is grade 5, and 6 lines spaced at 60 degree intervals is grade 8. nuts are marked in several different ways—see identification marks for hex and heavy hex nuts below. for other grade and property class specifics, look at these reference charts… hex cap screw specifications

Heavy duty hex bolt and nut of 12.9 grade us $0.39-2.0 / piece ( fob price) stainless steel heavy hex bolts and nuts us $98-150 / kilogram ( fob price) din6914, astm a325m, a490 heavy hex bolt for steel structure grade 8.8s/10.9s/10.9hv us $0.01-2 / piece ( fob price) astm j429 heavy hex bolt us $0.1-0.5 / unit ( fob price) fashion bottom price ...

Made from grade 8 steel, these bolts can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. carriage bolts have a smooth, rounded head for a finished look. the square neck keeps these bolts from turning when tightening a nut.

Din 960hex cap screws, metric fine threadpart thread; din 961hex cap screws, metric fine threadfull thread; din 963 a- slotted flat head machine screws; din 964 a- slotted oval head machine screws; din 965 across recessed flat head machine screws; din 966 across recessed oval head machine screws; din 980 vself-locking nuts ...

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