The 1-966645-0: Gold-plated mating contacts on a copper-alloy base, with tin-plated solder tails, rated for the full 20-position complement.
Push-pull fastening, 6.20 mm insulation height
The push-pull fastening type mates without a locking latch; the 0.244" (6.20 mm) insulation height sets the z-height clearance above the board.
