These custom vented socket head screws were manufactured for our aerospace customer using A354 Grade BD material with MIL-DTL-13924 black oxide finish. 5/16-24 UNF was rolled to a length of .625 inches and the head was cold formed with drawing specified markings. A hole was drilled through to vent the parts at a diameter of .152 +.004/-.001" and a .063" hole was drilled across the thread. The drilled holes created burrs, especially at the drilled hole area on at the threaded end, which made these parts very tricky and time consuming to get perfectly right.
