What the 3.50mm Pitch Means for Your Board
The 1776130-4: The vertical orientation means the pins stand straight off the board, which suits wire-to-board connections where the cable enters from above and the header acts as a fixed board-mount half.
Supplied in bulk packaging. No official cross-reference or direct equivalent from other manufacturers is listed — the pitch and pin count are specific to the Buchanan series.
Through-hole solder termination — the contact tail length is 0.134" (3.40mm), enough for a standard 1.6mm PCB with the solder fillet visible on the bottom side. The shroud covers all four sides of the pins, which prevents bent pins during blind mating and provides keying against mismatched receptacles.