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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 class 8.8 steel, 10mm x 40mm

Metric non-serrated class 8.8 hex flange bolts

Partial thread

A hexagonal head for use with a wrench. (Note: Shorter lengths are found under full thread.) Meets DIN 6921 (1983). Flange bolts that are non-serrated are sometimes called frame bolts.

Metric serrated full thread class 8.8 hex flange bolts

Full thread, Serrated

A hexagonal head for use with a wrench. Meets DIN 6921 (1983). Serrated heads are designed to resist loosening.

See also

Flange bolts

Flange bolts

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