US Patent 7101233 Female terminal fitting

A female terminal fitting (10) has a box-shaped main portion (11) with an open front end. A resilient contact piece (17) is formed in the main portion (11) for resiliently contacting a mating male tab (30). A protection wall (22) extends continuously from a bottom wall (11C) before a resilient contact piece (17) while leaving a clearance for entry of the male tab (30). Catches (23) are provided at the opposite side edges of the protection wall (22) and engage with catchable portions (24) at the side edges of the front end of the main portion (11) for resisting opening forces on the main portion (11).