Hexagon Flange Bolts

Flange bolts have a round flange under the head that acts like a washer to distribute the load. Flange bolts without serrated ends are sometimes called frame bolts.

All inch sizes of flange bolts have a minimum tensile strength of 170,000 psi, a minimum Rockwell hardness of C37, and conform to Class 3A threads. ASTM A387 Grade 9 and Grade 12.9 are classified as alloy steel