History of HHK
| 1951 | April | Established in Osaka as a manufacturer of precision springs and spring washers. |
|---|---|---|
| 1954 | Started production of snap ring for bearings. | |
| 1957 | February | Osaka Crane Association (dealer) was organized. |
| 1958 | October | Tokyo sales office was opened. |
| 1959 | January | Tokyo Crane Association (dealer) was organized. |
| 1959 | September | Started producing spring components for bearings. |
| 1960 | Developed the crown-shaped cage for bearings. | |
| 1961 - 1962 | Developed the disc spring unit for the bullet train. | |
| 1968 | January | Tannan factory in Tannan-cho, Taki-district, Hyogo prefecture (present Sasayama-city) was opened. |
| 1970 | April | Heiwa Seiki Co., Ltd. was established in Konan-cho, Shiga prefecture. |
| 1972 | February | Obtained a patent for jagged cone disc springs. |
| 1974 | November | Obtained a patent for PS lock washers. Adopted by JR companies and private railways. |
| 1981 | June | Obtained a patent for the spring washer without baking formula. |
| 1984 - 1985 | Developed and supplied the coned disc spring unit to prevent vibration in Seto-Ohashi Bridge. | |
| 1987 | November | The second Tannan factory was opened next to Tannan factory. |
| 1989 | Novembe | Factories combined and renamed Tannan Seisakusho. |
| 1991 | February | Capital 385 million yen. |
| 2002 | November | Acquired ISO9001:2000 certificate (from JQA). |
| 2003 | August | Heiwa Seiki Co., Ltd. acuired the ISO9001:2000 certificate (from JQA). |
| November | Marged Heiwa Seiki Co., Ltd. and renamed as Shiga factory. | |
| Tannan Seisakusho was renamed as Sasayama factory. | ||
| 2004 | July | Sasayama factory was acquired ISO14001 certificate (from JQA). |
| 2005 | May | Nagoya sales office was opened. |
| 2006 | PS lock washers supplied to Taiwan High Speed Rail (Taiwan Shinkansen). | |
| 2006 | November | Shiga factory was acuired ISO14001 certificate (from JQA). |
| 2007 | February | Kakegawa sales office was opened. |
| 2007 | September | The fourth Shiga factory was opened. |
| 2008 | August | Heiwa Hatsujyo Industry Co., Ltd. was acquired ISO14001 certificate (from JQA). |
| 2011 | October | Heihatsu Spring (Suzhou) Co., Ltd. was established. |
| 2013 | April | A test facility of large disc spring units was built at the Sasayama factory. |
| 2013 | August | Takasaki sales office was opened. |
| 2014 | June | Heihatsu (Thailand) Co., Ltd. was established. |