3-5177986-1 is a 0.8mm pitch fine pitch SMT stacking connector plug designed for parallel board-to-board applications. This vertical plug features 40 positions with 8µ" gold plating for reliable electrical contact and is supplied in tape and reel packaging for automated assembly. The connector has dimensions of A: 15.20mm [.598"], B: 21.80mm [.858"], and C: 20.20mm [.795"], with a contact pitch of 0.8mm [.031"]. It supports various stacking heights when paired with compatible receptacles, making it suitable for compact electronic assemblies requiring reliable parallel board interconnections. The RoHS compliant design ensures environmental compliance for modern electronic applications.