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Round head screw with square neck and nut Similar to DIN 603, steel 4.8, zinc-plated with washer and nut
Round head screw with square neck and nut Similar to DIN 603, steel 4.8, zinc-plated with washer and nut - 1
Round head screw with square neck and nut Similar to DIN 603, steel 4.8, zinc-plated with washer and nut - 2
Round head screw with square neck and nut Similar to DIN 603, steel 4.8, zinc-plated with washer and nut - 3

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Round head screw with square neck and nut Similar to DIN 603, steel 4.8, zinc-plated with washer and nut

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Variants

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