A submersible well pump assembly has an electrical motor connected with the pump. An electrical receptacle on the motor has a base into which a central bore and first and second threaded holes on opposite sides of the bore extend, the threaded holes having nominal major diameters that are the same. A motor lead extends to the motor and has an electrical connector that mates with the receptacle. The electrical connector has a flange containing first and second bolt holes, the second bolt hole having a diameter nearly the same as the diameter of the second threaded hole. The first bolt hole has a diameter that is larger than the diameter of the second bolt hole and also larger than the diameter of the first threaded hole. Bolts extend through the bolt holes into threaded engagement with the threaded holes.