|1921||Jiro Hamai founded HAMAI Manufacturing Works, a private company.|
|1936||Successfully produced a prototype High Precision Gear Hobbing Machine.|
|1938||HAMAI Machine and Tool Mfg. Works. Ltd. was established.|
|1946||Corporate name was changed to HAMAI CO.,LTD.|
|1952||Started production of Gear Testing Machines.v|
|1954||Started production of Flat Lapping Machines.|
|1957||Started production of precision gears on Swiss Reishauer Gear Grinders.|
|1963||Was listed on the Tokyo Stock Exchange Second Section. Osaka Branch Office was opened.|
|1964||Started production of Full Automatic High Precision Gear Hobbing Machines Models: 130A and 40A|
|1965||Joined the Japan Machine Tool Builders Dai-ichi Group (JMD).|
|1969||Completed first phase of Ashikaga manufacturing facility plant project. . Started production of Production Milling Machines under license agreement with Hitachi Seiki Co., Ltd.|
|1971||Completed second phase of Ashikaga manufacturing facility plant project. Started production of Boring and Milling Machines under license agreement with Butler, England.|
|1976||Started production of the SP series High Speed High Power Hobbing Machines. Started production of the MC series Vertical Machining Centers.|
|1978||Started production of the MAC series Ram type Milling Machines.|
|1980||Started OEM production for P&W, USA. Completed second phase of Ashikaga manufacturing facility plant project.|
|1982||Started production of Vertical Machining Centers 3VA, 5VA, and NC Copy Milling Machines.|
|1983||Started production of Horizontal Machining Centers Model: 3HA.|
|1984||Opened Kitakanto Branch Office. Started production of Flat Lapping Machines Model 18BF.|
|1989||Concluded a technical license agreement on Gear Hobbing Machines with LIEBHERR, Germany.|
|1993||Started production of Flat Lapping Machines Models 22BF, 24BF, and 28BF.|
|1994||Started production of Flat Lapping Machines Models 16BF, and 32BF.|
|1998||Started production of Polishing Machines for 16" wafers (Delivered to SSI).
Started production of Single-sided Polishing Machines Model HS-360.
|1999||Started production of CNC Hobbing Machines Model N60.
Started production of Ultra-Precision Flat Lapping Machine Model 16BN.
|2000||Started production of Ultra-Precision Flat Lapping Machines Models 24BN and 32BN.
Started production of Single-Side Lapping Machine Models HS470/630/840..
Obtained ISO9001 certification(Lloyd's, JAB, UKAS)
|2003||Started production of Ultra Precision Lapping and Polishing Machine 46BN|
|2005||Started production of CNC Hobbing Machine N80|
|2006||Established Hamai Engineering Co., Ltd., a non-consolidated subsidiary for
Started production of CNC Hobbing Machine N40
|2009||Concluded a sales agreement on hobbing cutters with Schnyder SA, Switzerland|
|2010||Started production of Single-Side Polishing Machine HS-1200|
|2012||Established Hamai Machine Technos (Shanghai) Co., Ltd.|
|2020||Introduced on a book, “The Companies with a Long History in Tokyo.”|