The 5499910-6: The 26 circuits are fully loaded — no empty positions to track.
Latch Lock and Shrouded Walls — Vibration-Resistant Mate
The header uses a latch lock with short eject hooks — the latch engages the mating receptacle's locking ramp, providing positive retention against cable pull or vibration. A keying slot and mounting flange are included — the keying slot prevents mismating with a non-keyed counterpart, and the flange gives a secondary mechanical anchor to the board beyond the solder joints.
Peer Comparison — 26 vs 12 Positions
The 5499910-6 carries 26 positions vs 12, and its gold mating finish supports higher cycle life than the tin finish on 1379030-3.