What This 10-Position Right-Angle Header Does in a Board Stack
The 20021212-00010T1LF: The 1.27 mm pitch sets the board routing density — you can break out two rows of signals in a narrow corridor without resorting to 0.5 mm pitch.
Gold Flash vs. Thicker Gold — What the Plating Tells You
The mating contacts carry gold flash, not a measured thickness like the 10.0 µin on the sibling 20021211-00010T4LF. Flash gold is a thin strike — adequate for a few tens of mating cycles in a one-time assembly or low-insertion application, but not for repeated field-service reconnects where thicker gold (15 µin or more) would be specified. If your design cycles the connector more than 50 times, consider the 20021211-00010T4LF with 10.0 µin gold — it adds measurable wear resistance without a pitch or footprint change.
Mating and Board Fit — What Crosses
Through-hole right-angle termination with a 0.091" (2.30 mm) post length — the solder tails extend below the board for wave-solder assembly.