Abstract: Each subassembly of a contact assembly has a group of contacts which are flat. Each of these contacts has a pair of upstanding blades symmetrical about a vertical axis which define a mouth for gripping and holding a lead, an enlarged passage for the free receipt of the lead passing from the mouth, converging edges of this passage for stripping insulation from the lead, and a coining slot defined by parallel edges for coining the conductive element of the lead and effecting good electrical contact and a mechanical interlock of the lead with the contact. Each blade has a stiffening rib extending laterally away from the plane of the contact to define an overall contact thickness essentially the same as the thickness of the throat of a standard lead installation tool. Each contact subassembly has an offset, flexible wiper for electrical engagement with a conductor of a male plug.