This specification covers the requirements for application of SMT 0.64mm Generation Y LAC, Hand Mate, GET, and USCAR–approved header assemblies. The header assemblies are available in vertical, right–angle, and hybrid configurations. All configurations (except the hybrid) contain 0.64 [.025] surface mount pin contacts; the hybrid contains 0.64mm and 1.5mm surface mount pin contacts. These header assemblies are available with 6, 18, 20, 26, and 30 positions having in–row contact spacing on 2.54 [1.0] centerlines and row–to–row contact spacing on 1.27 [.050] centerlines.