|0.4375 (7/16)||Partial||14||3.0000 (3)||170M PSI||Plain Finish||0.1460|
You call them Ferry Cap Screws, Counterbore Screws, or Double Hex Screws. We call them 12 Point Flange Screws. Used in many industries, they’re used primarily in diesel motors. The 12 points on the head prevent the edges from rounding out better than the hex head. Earnest carries Grade E9, stronger than Grade 8, to withstand rough conditions. This also allows for the screws to be more securely fastened and used more than once.
12 Point Flange Screw – E9-170M