Pitch and footprint — the 1.25 mm spacing check
The 1734261-4: The 0.049" (1.25 mm) pitch on this 4-position header is the tightest among the HPI single-row siblings — the board layout engineer needs to verify trace routing and clearance before committing the footprint.
Peer comparison — pitch and position count
Compared to the 1-2232960-3 (3 positions, 2.50 mm pitch, through-hole) or the 1-292164-1 (11 positions, 2.00 mm pitch, through-hole), the 1734261-4 is the only SMD right-angle option in this set and the only one at 1.25 mm pitch — it fits a denser board layout where through-hole headers won't clear.