For mating products see stock numbers ; 771-8256 771-8256 , ; 771-8278 771-8278 , ; 7718290 7718290 , ; 771-8329 771-8329 , ; 771-8335 771-8335 and ; 771-8240 771-8240 , ; 771-8262 771-8262 , ; 771-8284 771-8284 , ; 771-8307 771-8307 , ; 771-8313 771-8313 typically. WR-DSUB - IDC D-Sub Connectors with 4-40 UNC Screwlocks. WR-DSUB series IDC cable mounting D-sub plug and socket connectors with 4-40 UNC screw locks. These IDC d-sub plug and socket connectors have a blue UL94-V0 PBT insulator with a steel tin plated shell. The contacts for these WR-DSUB series IDC d-sub connectors are made from copper alloy with a selective gold plating.