TE Connectivity Positive Lock Connector Housings - MK I 250 Series A range of MK I 250 Series Positive Lock connector housings for both tab and receptacle crimp terminals with a 6.35mm mating face area dimension. These MK I 250 Series Positive Lock connector housings have Polyamide 6.6 housings with either a 94 V-0 or 94 V-2 rating and are available in various colours. For details, please refer to table.