UG-1019 HN BULKHEAD 50-OHM JACK-JACK HN, GASKETED BULKHEAD ADAPTER. 50 OHM, JACK-JACK, 1.97~ X 1.00~. (0.765~ X 0.712~ PANEL CUTOUT) GASKETED BULKHEAD WITH NUT. 0.765~ X 0.712~ PANEL CUTOUT. (DWG REV 11/91 , JFK).