| 1939 | Hiratakogyo began operation in Honjo-ku, Tokyo, for the purpose of manufacturing metal press products. |  1952 Production |
| 1952 | Hiratakogyo started manufacturing parts for motorcycles and scooters for Honda Motor Co., Ltd. |
| 1953 | Hiratakogyo changed the company name to Hirata Press Kogyo |
| 1961 | Hongo seisakusho started operation in Toda-machi, Kita Adachi-gun, Saitama, for the purpose of manufacturing and selling press sheet metal and machined parts. |
| 1967 | Hirata Press Kogyo and Hongo seisakusho received an order to produce automobile parts from Honda Motor Co., Ltd., and started full-scale mass production. |  1963 Kameyama |
| 1984 | Hirata Press Kogyo and Hongo seisakusho entered into a capital participation in KTH Parts Industries Inc. (currently the Company’s consolidated subsidiary) in Ohio in the United States (and thereafter established four bases in North America). |
| 1990 | Hirata Press Kogyo changed its company name to HIRATA TECHNICAL CO., LTD |
| 1991 | Hongo seisakusho changed its company name to HONGO CO., LTD. |  1984 KTH |
| 1996 | KTH began operations of Kalida Manufacturing, Inc. (KMI) in Kalida, Ohio |
| 1998 | KTH began operations of KTH Shelburne Manufacturing, Inc., (KSM) in Shelburne, Ontario, Canada |
| 2001 | KTH began operations of KTH Leesburg Products, LLC. (KLP) in Leesburg, Alabama |  2010 H-ONE Thailand |
| 2006 | HIRATA TECHNICAL CO., LTD., and HONGO CO., LTD., merged and changed the company name to H-ONE CO., LTD. Moved the head office to Omiya-ku, Saitama-shi, Saitama |
| 2012 | Established G-ONE AUTO PARTS DE MEXICO, S.A. DE C.V. in Guanajuato, United Mexican states, through joint investments with G-TEKT CORPORATION |  2015 KTH R&D Center |
| 2015 | H-ONE CO., LTD in conjunction with KTH Parts Industries began operations of a Research and Development facilities in Plain City, Ohio |
