Fine pitch electrical connector socket, comprising at least two opposing walls between which a passageway is defined for receiving an insert with contact pins, the walls being formed from a fiber reinforced flame retardant thermoplastic polymer composition comprising a polyamide polymer, a flame retardant system and a fibrous reinforcing agent, wherein the polyamide polymer comprises at least a semi-crystalline polyamide (A) having a melting temperature Tm-A of at least 280DEGC, and optionally a second polyamide (B); the polyamide polymer has a crystallization enthalpy Hc of at least 50 J/g, the melting temperature Tm-A and crystallization enthalpy Hc being measured by DSC with the method according to ISO11357-1/3 with a heating and cooling rate of 20 C; the flame retardant system comprises a combination of (C-1) a metal salt of dialkylphosphinate and/or diphosphinate and (C-2) a metal salt of phosphoric acid; and the composition has a heat distortion temperature of at least 265 C, measured according to ISO 75-1/2.