HMZD 2PR RA HDR 40P Row-to-Row Spacing: 1.5 mm Row-to-Row Spacing: .059 in Mating Alignment: With Mating Alignment Type: Guide Lugs Number of Rows: 4 High Speed Backplane Connector | 1.5 mm .059" With Guide Lugs | Part Number: 6469169-1 | Internal Number: 6469169-1 | TE Connectivity | Z-PACK