The 112740-13: Its 75 Ohm impedance targets video distribution, telecom baseband, and test equipment where signal reflection matters more than power handling. The connector ships as a kit — one jack, one lockwasher, one nut — so a panel-mount install needs nothing else from the hardware drawer.
What the 75 Ohm Rating Means for Your Signal Chain
A 75 Ohm BNC on a 50 Ohm line creates a 1.5:1 VSWR bump at the interface, which is fine for DC or low-frequency control but eats into the return-loss budget above a few hundred MHz. This connector is built for the 75 Ohm ecosystem: RG6, RG59, and the Belden 1505A/1694A cable families. The 4 GHz bandwidth and 0.2 dB insertion loss cover the full SDI video range and most telecom T1/ paths with margin.
Mounting and Termination — Board Edge or Bulkhead
Two mounting options in one part. For a panel feed-through, the bulkhead front-side nut clamps the connector to a chassis cutout; the included lockwasher keeps the nut from backing off under vibration. The brass body with gold finish resists corrosion in indoor equipment racks and field-terminated enclosures alike.