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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, 30mm

Metric non-serrated full thread JIS hex flange bolts

JIS full thread

A hexagonal head for use with a wrench. Meets JIS B1189 Type 2 (2005). Flange bolts that are non-serrated are sometimes called frame bolts.

See also

Flange bolts

Flange bolts

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