Hexagon flange bolts DIN 6921 With knurled underhead Geomet 500 5x8 50000 pcs. 5x10 400000 pcs. 5x12 50000 pcs. 5x16 100000 pcs. 6x15 50000 pcs. Socket head cap screws DIN 912 Geomet 5x15 300000 pcs.