1.27mm Pitch, 10-Position Dual-Row Header
The 20021121-00010T4LF: This is a 10-position, dual-row unshrouded pin header from Amphenol ICC's Minitek127® series, pitched at 0.050" (1.27mm) between contacts and between rows.
Gold Mating Finish, Tin Post — Signal-Duty Plating
The solder posts are tin-plated (50.0µin), which wets well to standard lead-free solder paste in reflow. Gold on the interface, tin on the termination: this is the standard split for signal headers where the mating half sees occasional disconnect but the solder joint is one-shot.
Surface Mount, Push-Pull Unshrouded
This makes it a straight board-to-board interconnect where the mating receptacle is held in place by the pin friction alone.
