It uses a 0.100" (2.54 mm) pitch on both rows and the row spacing, which is the standard footprint for legacy 0.100" grid board-to-board or wire-to-board interconnect. The header is loaded in all positions — no skipped pins — so the 40 circuits match the BOM line count directly. The UL94 V-0 black housing and push-pull latching are typical for this class of unshrouded header.
Board layout and footprint
The 0.100" (2.54 mm) pitch and 0.100" (2.54 mm) row spacing place the pins on a standard 0.100" square grid.
No keying or shroud — the mating half must be aligned manually. For vibration-prone assemblies, consider a shrouded header or a secondary locking mechanism.