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Metric flange bolts, Zinc plated steel, 20mm

Flange bolts are machine threaded for use with a nut. They have a flange under the head that acts like a built in flat washer.

Metric flange bolts, Zinc plated steel, 20mm
Full thread A hexagonal head for use with a wrench. Meets DIN 6921 (1983). Flange bolts that are non-serrated are sometimes called frame bolts. Zinc plated class 8.8 steel A low carbon steel for general use. Zinc plated for moderate corrosion resistance. A tempered medium carbon steel. Class 8.8 is hardened, but it is not as strong as class 10.9. It is commonly found in automotive applications. Class 8.8 is similar to grade 5. Zinc plated class 10.9 steel A low carbon steel for general use. Zinc plated for moderate corrosion resistance. A tempered medium carbon steel. Class 10.9 is stronger than class 8.8. It is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8. Show Details Hide Details	Full thread, Serrated A hexagonal head for use with a wrench. Meets DIN 6921 (1983). Serrated heads are designed to resist loosening. Zinc plated class 8.8 steel A low carbon steel for general use. Zinc plated for moderate corrosion resistance. A tempered medium carbon steel. Class 8.8 is hardened, but it is not as strong as class 10.9. It is commonly found in automotive applications. Class 8.8 is similar to grade 5. Show Details Hide Details