We supply these custom grade 5 shoulder bolts to our long time customer with recurring annual blanket purchase orders, typically with annual usage ranging between 20,000 and 25,000 pieces. They are domestically manufactured to a grade 5 standard with commercial zinc, bake and clear chromate finish. The shoulder measures .40" in diameter by .50" in length, with 5/16-18 thread rolled the balance of the screw. The overall length is 1-1/4" underneath the head.
We supply these custom hex shoulder screws to our Canadian customer, with the shoulder measuring .425 +/-.002 by 1.650 +.005/-.000 in length. 5/16-18 thread was incorporated measuring .50" in length including the unthreaded portion before the rolled thread begins. .055 radius hole was then drilled at .102" from the end of the threaded portion.