What the 3.96 mm pitch and friction lock mean for your board
The 644752-5: The 3.96 mm (0.156") pitch is the board footprint anchor — it matches the MTA-156 receptacle family and sets the per-contact current ceiling. In a panel where the wire bundle is routed through a moving door, that lock prevents intermittent opens that an unshrouded header would see.
5 positions, single row — BOM fit and layout
Five positions, all loaded, single row. Insulation height is 0.425" (10.80 mm) — the header stands off the board by that amount, which matters when the mating receptacle has a wire exit that needs clearance above the PCB.
Voltage, temperature, and flammability envelope
Rated 600VAC — this is the insulation withstand between adjacent pins and from pin to ground.