The 1-825440-5: The square male pins are gold-plated on the mating surface (3.90µin thickness) for reliable low-resistance contact over repeated mating cycles, while the solder tails receive a tin finish (98.4µin) for good solderability.
Fastening is push-pull, meaning the header relies on friction from the mating receptacle for retention — no locking latch. This is typical for unshrouded headers used in low-vibration, serviceable connections.
