Abstract: A connector includes a housing having a cavity and a terminal assembly accommodated in the cavity and including a first terminal. The first terminal has a first mating portion, a first connecting portion, and a first mating beam extending from the first mating portion to the first connecting portion. The terminal assembly includes an inserting block usable with the first terminal and having an inserting block frame. The inserting block frame has a first passage and a preloading portion. The first passage allows the first mating beam to pass therethrough. The preloading portion supports the first mating beam and applies a pre-pressing force to the first mating beam.