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Round head screw with square neck and nut
Round head screw with square neck and nut - 1
Round head screw with square neck and nut - 2

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Round head screw with square neck and nut

DIN 603, steel 4.8, plain, with nut

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Available in 165 versions

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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.