FIN NECK BOLT DIN 603
A round head Fin neck bolt din 603 with a flat bearing surface which intersects with the shank at a 90° angle. Where the bearing surface and shank
meet are two fins, 180° opposite each other. The bolt is made from low carbon steel.
Primarily used in thin plywood to keep the bolt from turning when nut is being tightened.
Fin Neck bolts lock into steel or wood surfaces to assist bolt tightening, ASME B18.5 bolt with a flat bearing surface which intersects with shank at a 90.