It uses a 0.100" (2.54 mm) pitch on both the pin-to-pin and row-to-row spacing, which matches the standard 0.100" grid for prototyping and production boards.
Plating and contact construction
The phosphor bronze contact material gives good spring retention over temperature swings.
With a 0.100" (2.54 mm) pitch and 0.100" (2.54 mm) row spacing, the 70-position footprint occupies a 35-position-per-row layout — 3.500" (88.9 mm) across the pins. The overall contact length is 0.600" (15.24 mm), with a mating length of 0.380" (9.65 mm) and a post length of 0.120" (3.05 mm) for the solder tail.