The 031-5493-1010: It mounts through a panel bulkhead with a front-side nut and solders to the board through the shield and center contact terminations.
Board Lock and Mounting Detail
This is paired with the panel mount bulkhead — the front-side nut clamps the connector to the panel, and the through-hole solder tails lock the signal path to the board. The isolated feature indicates the ground path is separated from the panel, useful when the chassis ground and signal ground need to be kept distinct.
The 500 V voltage rating covers the isolation requirement for most 50 Ohm signal paths, though the practical limit is usually the cable's rating.
Comparing to 031-5538-10RFX
The 031-5538-10RFX is the closest functional peer — same BNC jack, same 50 Ohm impedance, 1 GHz bandwidth, 500 V rating, and board lock feature. The main difference is housing color: the 031-5493-1010 has a silver and white housing, while the 031-5538-10RFX is black and silver. Both are active, both use the same dielectric and contact materials. If the BOM specifies a silver housing, the 031-5493-1010 is the match; if color is flexible, either works.