Metric hex bolts, Zinc plated class 8.8 steel

Hex bolt diameter is measured on the outside of the threads.

Metric hex bolt diameter

Resources

Diameter and Thread pitch
Coarse (standard) thread 5mm x 0.8mm 6mm x 1.0mm 8mm x 1.25mm 10mm x 1.5mm 12mm x 1.75mm 14mm x 2.0mm 16mm x 2.0mm 18mm x 2.5mm Fine thread 8mm x 1.0mm 10mm x 1.25mm 12mm x 1.5mm 14mm x 1.5mm 16mm x 1.5mm Super Fine 10mm x 1.0mm 12mm x 1.25mm