2-520081-2 Ultra Fast 110/0.125 Series Series Red Insulated Crimp Receptacl. Ultra-Fast fully insulated receptacle crimp terminals designed to prevent shock and electrical short circuits from exposed leads by providing complete encapsulation to a tab and receptacle when mated. The housings of these FASTON 110/125 series Ultra-Fast receptacle crimp terminals are made from UL 94 V-2 type 6/6 nylon which completely enclose a tin plated copper alloy FASTON receptacle contact which is recessed within the housing to allow its use in 600V applications.