The 2-521104-2 is Ultra-Fast FASTON series ultra-fast fully insulated FASTON Receptacle offers the advantage of a completely protected terminal and a wire crimp with comparable electromechanical performance to open barrel F crimp FASTON terminals. The user-friendly design combines easy mating with rounded corners. The 0.187 and 0.250 series receptacles incorporate a two-stage roll configuration and a cantilever mounted dimple which provides easy insertion and multiple independent points of contact for reduced tab interface resistance. In addition, electrical short circuits from exposed leads are eliminated, even in equipment requiring close contact spacing. The ultra-fast FASTON receptacle housing completely encloses a tin plated copper alloy premier FASTON receptacle which has been stress-relieved for increased durability and resistance to abuse. The FASTON receptacle is recessed sufficiently within the housing to allow its use in 600V applications.