9-146277-0 is a single-row vertical breakaway header with board retention tails, part of the AMPMODU .025 [0.64] square interconnection system. This 40-position header features a .100 [2.54] centerline spacing with dimensions of A = 3.984 inches [101.19 mm] and B = 3.900 inches [99.06 mm]. The header has C = .125 [3.18], D = .318 [8.08], and E = .200 [5.08] dimensional specifications. This RoHS-compliant component is designed for reliable board-to-board connections in electronic assemblies requiring secure retention features.