75 Ohm BNC HD Jack — 18 GHz, Bulkhead Mount
The 034-1028H-12G: It belongs to the HD-BNC series, which extends the standard BNC interface to 18 GHz while maintaining the familiar bayonet lock.
75 Ohm vs 50 Ohm — This One Is for Video
This jack is 75 Ohm, not the 50 Ohm typical of standard SMA or BNC connectors. The 18 GHz bandwidth is well beyond what a standard 75 Ohm BNC can handle — the HD-BNC interface achieves this through tighter mechanical tolerances and a reduced air gap in the dielectric. If your system runs 50 Ohm test equipment, the 034-1028H-12G will cause a mismatch; stick with the 50 Ohm variants in the same HD-BNC family.
The package includes two pieces: the connector body and the mounting nut. No lockwasher or gasket is included in this kit, so plan for a separate sealing washer if the panel requires an environmental seal.