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M4 Hexagon Fullnuts DIN 934 Cl.6 BZP are applied to a matching male thread (examples include bolts, set screws and machine screws) and tighten two or more component parts together. Hexagon fits corresponding sockets and spanners. Conforms to DIN 934. Class 6 Steel. Bright Zinc Plate (BZP) finish offers resistance to corrosion.