EN ISO 4017 Hexagon head screws fully threaded M12x40 A193 B16 Bichromated 2700 pcs. Nuts A194 Gr.4 Bichromated 2700 pcs. EN ISO 4017 Hexagon head screws fully threaded M16x50 A193 B16 Bichromated 1200 pcs. Nuts A194 Gr.4 Bichromated 1200 pcs.