Hex socket countersunk screw according to ISO 10642 / DIN 7991 in steel grade 8.8, plain (uncoated) surface. A versatile fastener for use in dry or controlled environments and for assemblies that will be surface-treated after installation. Provides reliable strength and a flush, low-profile fit for general mechanical and steel structures. Available in multiple sizes and lengths from SWEBOLT & BOTNIA BOLT.