Hexagon socket head cap screws ISO 4762 M5x20 Because of oxidizing acids and hypochlorite in pool water, material needs to be Titanium Ti6Al4V reaching 1000 N/mm² (or material 1.4571 is AISI 316TI = X6CrNiMoTi17-12-2) But screw shall withstand ~1200 N/mm² (depending on the elongation). Please offer 30.000 / 150.000 and 300.000 pcs. Samples are required. Hoping for max deliverytime 8-10 weeks