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Hexagonal flange self tapping
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Hexagonal flange self drilling and self tapping screws GB/T 15856.4-2002
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Cross recessed countersunk head self drilling and tapping screws GB/T 15856.2-2002
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Plum blossom groove self tapping screw GB /T 2670.1 – 2017
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Hexagonal head tapping screw
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Cross recessed countersunk head self tapping screws GB/T 846-2017
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Slotted round head tapping screws GB /T 5282 – 2017
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Self tapping screw DIN7971-1990
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