DIN 6921 specifies hexagon bolts with an integral, serrated flange that spreads clamping load and resists loosening without a separate washer — a common standard for automotive and machinery assembly.
- Steel Grades
- 4.6, 5.6, 8.8, 10.9
- Finish
- Plain, Zinc Plated, Hot Dip Galvanized (HDG), Black Oxide, Nickel Plated, Geomet, Dacromet Coated
