Harwin M20 Series Crimp Receptacle Contacts M20 crimp receptacle contacts made from phosphor bronze with a dual beam design for use in M20 series crimp housings. The dual beam design of these contacts offers high durability, improved repeatable retention and connection resulting in increased connector reliability. These M20 crimp receptacles are for use with a wire size range of 30 to 22 AWG and are available with gold or tin plating on the contact area. For suitable crimp tool please see stock number 717-3666.