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Flange bolts have a circular flange under the head that acts like a washer to distribute the load. Flange bolts that are non-serrated are sometimes called frame bolts.

Flange bolts, 5/16"

Non-serrated hex flange bolts

Partial thread

A hexagonal head for use with a wrench. (Note: Shorter lengths are found under full thread.) Meets IFI-111 (2002). Flange bolts that are non-serrated are sometimes called frame bolts.

Non-serrated full thread hex flange bolts

Full thread

A hexagonal head for use with a wrench. Meets IFI-111 (2002). Flange bolts that are non-serrated are sometimes called frame bolts.

Serrated full thread hex flange bolts

Full thread, Serrated

A hexagonal head for use with a wrench. Meets IFI-111 (2002). Serrated heads are designed to resist loosening.

Serrated full thread hex flange bolts with oversize flange

Oversize, Full thread, Serrated

A hexagonal head for use with a wrench. These bolts have an extra-large flange. Meets IFI-111 (2002). Serrated heads are designed to resist loosening.

See also

Flange bolts

Metric flange bolts

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