Amphenol FCI D-Sub Screwlocks. A range of male and female screwlocks for use with D-sub connectors. Stock numbers ; 863-2942 863-2942 , ; 863-3002 863-3002 , ; 121-7512 121-7512 , ; 673-4948 673-4948 are UNC 4-40 female screwlocks Stock number ; 673-4945 673-4945 is an M3 female screwlock Stock numbers ; 137-0840 137-0840 and ; 137-1002 137-1002 are UNC 4-40 male screwlocks