Hirschmann 731 72 Series Crimp Contacts for NR Series Connectors 0.5 to 1.5mm – Hirschmann 731 725-021, Crimp plug contacts that accept 0.5 to 1.5mm² cable, suitable for Hirschmann NR-series and ST-series (5-pole) connectors. Hirschmann 731 725-021 RSC 162 Ag Rolled Plated Crimp Plug 0.5 to 1.5 mm2