The 534978-9: Shrouded on all four walls, the housing protects the pins from bent contacts during blind mating and provides keying against mis-insertion.
Sizing the Contact Interface for Signal Duty
That gold thickness supports 500+ mating cycles minimum — in a rack-mounted card that gets swapped quarterly, the contact interface outlasts the chassis. The square pin geometry mates with standard dual-beam receptacles in the AMPMODU system.
Insulation height is 0.550-inch (13.97 mm) above the board, so plan the keep-out zone on adjacent components. The base product number 534978 covers the series; the -9 suffix identifies this specific plating and packaging variant (tube).