Exhibit 21

CORPORATE DIRECTORY

Our consolidated subsidiaries and affiliated companies as of June 30, 2019 are:

Consolidated Subsidiaries and Affiliated Companies of Kennametal Inc.

Kennametal (Malaysia) Sdn. Bhd.

Kennametal (Singapore) Pte. Ltd.

Kennametal (Thailand) Co., Ltd.

Kennametal Australia Pty. Ltd.

Kennametal de Mexico, S.A. de C.V.

Kennametal Distribution Services Asia Pte. Ltd.

Kennametal Hardpoint (Taiwan) Inc.

Kennametal Holdings Europe Inc.

Kennametal International S.A. (Panama)

Kennametal Japan Ltd.

Kennametal Korea Ltd.

Kennametal Manufacturing S.A. (Pty) Ltd.

Kennametal Shared Services Private Limited

Kennametal South Africa (Pty.) Ltd.

PT. Kennametal Indonesia Services

Consolidated Subsidiary of Kennametal (Singapore) Pte. Ltd.

Widia Shinki Vietnam LLC (partnership)

Consolidated Subsidiaries of Kennametal Holdings Europe Inc.

Deloro Stellite Holdings Corporation

Kennametal Holdings, LLC

Kennametal Holdings, LLC Luxembourg S.C.S.

Consolidated Subsidiaries of Deloro Stellite Holdings Corporation

DSGP LLC

Kennametal Stellite, L.P.

Kennametal Stellite Inc.

Kennametal Stellite (Shanghai) Co., Ltd. (Joint Venture)

Consolidated Subsidiary of Kennametal Holdings, LLC Luxembourg S.C.S.

Kennametal Luxembourg Holding S.à r.l.

Consolidated Subsidiaries of Kennametal Luxembourg Holding S.à r.l.

Kennametal Argentina S.A.

Kennametal Chile Ltda.

Kennametal do Brasil Ltda.

Kennametal Europe GmbH

Kennametal Europe Holding GmbH

Kennametal Luxembourg S.à r.l.

Comericializadora Kennametal Bolivia S.R.L.

Consolidated Subsidiaries of Kennametal Luxembourg S.à r.l.

Kennametal Asia (HK) Ltd.

Kennametal Ltd.

Kennametal Sintec Holding GmbH

Consolidated Subsidiaries of Kennametal Asia (HK) Ltd.

Kennametal Asia (China) Management Co. Ltd.

Kennametal (Baotou) Company Ltd.

Kennametal (China) Co. Ltd.

Kennametal Hardpoint (Shanghai) Co., Ltd.

Kennametal (Xuzhou) Company, Ltd.

Consolidated Subsidiary of Kennametal Sintec Holding GmbH

Kennametal Sintec Keramik Asia Ltd.

Consolidated Subsidiary of Kennametal Sintec Keramik Asia Ltd.

Sunshine Power-Tech (Shanghai) Ltd.

Consolidated Subsidiaries of Kennametal Europe GmbH

Hanita Metal Works, Ltd.

Kennametal Holding GmbH

Kennametal Nederland B.V.

OOO Kennametal

Consolidated Subsidiary of Hanita Metal Works, Ltd.

Hanita Cutting Tools, Inc.

Consolidated Subsidiaries of Kennametal Holding GmbH

Kennametal GmbH

Kennametal Hungaria Kft.

Kennametal Logistics GmbH

Kennametal Shared Services GmbH

Kennametal Sintec Keramik GmbH

Widia GmbH

Consolidated Subsidiaries and Affiliated Companies of Kennametal GmbH

Kenci S.L.

Kennametal Belgium BVBA

Kennametal Deutschland GmbH

Kennametal France S.A.S.

Kennametal GmbH Organizacni Slozka

Kennametal GmbH Zweigniederlassung Osterreich

Kennametal GmbH Zweigniederlassung Rumanien

Kennametal GmbH Zweigniederlassung Slowakei

Kennametal Infrastructure GmbH

Kennametal Italia S.p.A.

Kennametal Kesici Takimlar Sanayi Ve Ticaret Anonim Sirketi

Kennametal Polska Sp. z o.o.

Kennametal Produktions GmbH & Co. KG. (partnership)

Kennametal Sp. z o.o.

Kennametal Stellram S.r.L.

Kennametal UK Limited

Ruebig Real Estate GmbH & Co. KG

Consolidated Subsidiary of Kennametal Italia S.p.A.

Kennametal Italia Produzione S.R.L.

Consolidated Affiliated Company of Kennametal Produktions GmbH & Co. KG (partnership)

Kennametal Real Estate GmbH & Co. KG (partnership)

Consolidated Affiliated Company of Kennametal Deutschland GmbH

Kennametal (Deutschland) Real Estate GmbH & Co. KG (partnership)

Consolidated Subsidiary of Kennametal Sp. z o.o

Kennametal Produkcja Sp. z o.o.

Consolidated Subsidiaries and Affiliated Companies of Widia GmbH

Kennametal Widia Produktions GmbH & Co. KG (partnership)

Kennametal Widia Real Estate GmbH & Co. KG (partnership)

Meturit AG

Consolidated Subsidiary of Meturit AG

Kennametal India Ltd.

Consolidated Subsidiary of Kennametal India Ltd.

Widia India Tooling Private Limited

Consolidated Subsidiaries of Kenci S.L.

Kenci Lda.

Kennametal Manufacturing Barcelona S.L.

Consolidated Subsidiaries of Kennametal UK Limited

Kennametal Logistics UK Ltd.

Kennametal Manufacturing UK Ltd.