An insulation displacement connector comprises a single-piece unitary connector body formed from a relatively thin, generally flat of electrically conductive material having a base portion and two pairs of resilient, wire-engaging arms projecting from one side of the base portion. Each of the pairs of arms define therebetween a wire-receiving slot configured for displacing insulation from a wire introduced therebetween and for gripping the wire. Each of the pairs of arms also defines a tool-engaging portion of a predetermined configuration for engagement by a tool for connecting a wire to the wire-receiving slot. The base portion and the pairs of resilient arms define a pair of opposed, parallel generally flat surfaces. At least one cutout is defined on the connector body for reducing the total area of these flat surfaces while maintaining the predetermined configuration of the tool-engaging portions. The invention includes a method for making such a connector and a connector terminal block employing a plurality of connectors of this type.