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

These bolts are all partially threaded. Shorter lengths are found with full thread.

Flange bolt diameter

Diameter and Thread count

See also

Non-serrated full thread grade 8 hex flange bolts

Flange bolts, Full thread, Grade 8 steel plain finish

Full thread, including shorter lengths.

Flange bolts

Metric flange bolts

Flange bolts have a flange on the bottom of the head that distributes the load like a washer.