These are custom modified socket head cap screws in alloy steel material.  Standard off the shelf M4-0.7 X 14MM socket head cap screws were modified to allow their use as captive screws with partial thread and modified head dimensions.  The ground shoulder area measures 8.80MM +/- 0.3MM in length and a dimater of 3.30MM +/- 0.15MM.  The head was modified to a diameter of 5.50MM +/- 0.15MM and a height of 4.0MM.  Material certs and a certificate of conformance was provided with the parts per customer’s specifications.