Small Pitch Assembly consists of an electrical I/O connector which is particularly suitable for docking-type connection applications and has a terminal block assembly held within a protective exterior casing. The terminal block assembly includes two interengaging halves which receive a plurality of metal terminals disposed thereon in a spaced-apart order. The terminals define two groups of terminals on each surface of the terminal block assembly halves and the two groups are defined by staggering the terminals lengthwise. A spacer is provided between the terminal block halves to maintain the terminals in their spaced apart order and includes projections which support insulation displacement terminals which extend from the terminals on opposite sides of the terminal block assembly. These insulation displacement terminals are arranged in a two separate tiers, which enable the connector to have an increased terminal density.