The 0901310140: This is a 40-position, dual-row unshrouded breakaway header on 2.54mm pitch, the standard 0.100-inch grid that matches the vast majority of IDC sockets and crimp receptacles in the C-Grid family. This keeps the board-side footprint small — the insulation height is only 0.098 inches (2.50 mm) above the board surface.
Tin-plated contacts at 118.1 µinch — cost-optimized duty
Both the mating and post finishes are tin, plated to 118.1 µinch (3.00 µm). Tin is a reliable, low-cost contact finish for moderate mating-cycle applications in clean, indoor environments. It does not match the cycle life of gold, but at this thickness it resists oxidation well for typical board-to-wire interconnects in automotive and general-purpose equipment. The contact base is brass — a standard spring material for pin headers. The square pin shape (0.025-inch square typical for 2.54mm pitch) provides a consistent four-point interface with the receptacle terminal.