Pitch and footprint — the dimensions that lock in the board layout
The 2122100060: This is a 6-position, double-row header on a 3.30 mm mating pitch with a 4.14 mm row spacing — those two numbers define the PCB hole pattern and the receptacle it mates with. The kinked solder tails (3.35 mm post length) provide retention during wave solder and help align the header during insertion — the kink acts as a standoff, keeping the insulator off the board surface. Through-hole mounting with kinked pins means this header is designed for wave or selective solder assembly, not press-fit or SMT reflow.
Glow wire and flammability — why this header clears safety gates
Glow wire compliant per the feature list — this means the header has been tested to IEC 60335-1 for resistance to ignition from a hot wire element, a common gate for white goods, HVAC, and lighting fixtures.