50 positions at 1.27 mm pitch — board layout fit
The 5-104895-5: This is a 50-position, dual-row header on 1.27 mm pitch, with row spacing also at 1.27 mm. For a signal-only bus, the current budget per circuit is adequate; for power delivery, you'd need to parallel multiple contacts or step up to a wider-pitch series.
Board lock and latch holder — vibration resistance
Applications listed include Automotive, General Purpose, Medical, Military, and Telecommunications — the latch and board lock are what make this header suitable for those vibration-prone settings.
Gold mating finish — 30.0 µinch
The tin post finish is standard for SMT solderability.