Hex socket cap screw according to ISO 12474 standard with metric fine thread (M-fine), strength class 12.9, plain (uncoated) surface. Fine threads provide improved tightening control, better vibration resistance, and greater thread contact over the same length compared to standard pitch. The plain finish is used in dry or controlled environments or when the screw will later be coated, for example with painting, flake coating, or hot-dip galvanizing (HDG). Class 12.9 provides extremely high tensile and clamping strength for critical applications. Available in multiple lengths and variants from SWEBOLT & BOTNIA BOLT.