250.000 pcs of welding screws M10x36 mm flat round head, see attached drawing Material : DIN 1654-2 QSt36-3 K + GKZ+K, 320-430 N/mm2 Corrosion test according to ISO 9227-NSS, 72 hours Surface threatment : A3F SIST EN ISO 4042 Control of bolt thread with measuring ring M10 6h Tolerance of free dimension : DIN 16901-150