EXHIBIT 21 PRINCIPAL SUBSIDIARIES Jurisdiction in Which Name of Subsidiary Organized or Incorporated ------------------ ------------------------- Hertel Cutting Technologies Inc. Tennessee, United States Kennametal Australia Pty. Ltd. Australia Kennametal Foreign Sales Corporation Barbados Kennametal Hertel AG Germany Kennametal Ltd. Ontario, Canada Kennametal GTS Pte. Ltd. Singapore J&L America Inc. Michigan, United States Kennametal Hertel G.m.b.H. Germany