MIL Spec MIL-DTL-83513/5 mounting hardware for the MDM Series Micro-D Connectors:. Stock number 770-7944 is a size 9-51 M5 low profile slotted head jackscrew assembly with a 2-56 UNC-2A thread. Stock number 770-7947 is a size 9-51 M6 high profile slotted