M4/BN781 DIN6798A is a through, system hole, and self-tapping, stainless steel, metric ISO, internally threaded fastener product manufactured to DIN6798A specifications by Bossard. It is designed for use in thin metal materials as thin as 0.5 mm. The product is made of stainless steel, which is highly resistant to corrosion and mechanical wear and tear. The product features a knurled shoulder and a lock nut with a cross slot on the underside that allows the fastener to be tightened evenly on both sides. The ISO metric sized threads and a wider body give it greater strength. In addition, the self-tapping feature reduces vibration and increases assembly time. The fastener is available in a range of sizes, including M4, M5, M6, and M8, with standard lengths ranging from 12 mm to 50 mm.