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Round head screw with square neck DIN 603, steel 4.8, zinc-plated, blue passivated (A2K)
Round head screw with square neck DIN 603, steel 4.8, zinc-plated, blue passivated (A2K) - 1
Round head screw with square neck DIN 603, steel 4.8, zinc-plated, blue passivated (A2K) - 2

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Round head screw with square neck DIN 603, steel 4.8, zinc-plated, blue passivated (A2K)

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