A wire to board connector assembly includes mating first and second connectors. The board (second) connector is configured for surface mounting to a circuit board and contains a plurality of surface mount terminals with a pair of contact arms defining a mating slot therebetween. The other, mating (first) connector includes a plurality of box-style terminals that are supported and restrained in place within a first connector housing. Projections are dispose in the first connector housing and extend lengthwise along the direction of the terminals and provide support for the terminals. Locking members are formed as part of the first housing and reliably engage the second housing.