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Round head screw with square neck and nut DIN 603 with nut, steel, strength class 4.8, zinc-plated, blue passivated
Round head screw with square neck and nut DIN 603 with nut, steel, strength class 4.8, zinc-plated, blue passivated - 1
Round head screw with square neck and nut DIN 603 with nut, steel, strength class 4.8, zinc-plated, blue passivated - 2

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Round head screw with square neck and nut DIN 603 with nut, steel, strength class 4.8, zinc-plated, blue passivated

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The flat square neck fixes the round head screw in a slot, for example, and allows tightening from the nut side without counter-tensioning.