• MITSUBISHI MOTORS (THAILAND)CO.,LTD.
• AUTOALLIANCE (THAILAND) CO.,LTD (SUBCONTRACT).
• TOYOTA MOTOR THAILAN CO.,LTD.(SUBCONTRACT)
• HONDA AUTOMOBILE (THAILAND) CO.,LTD.(SUBCONTRACT)
• THAI YAMAHA MOTOR CO.,LTD.
• THAI UNION FROCEN PRODUCT PLC.
• THAISTAINLEY CO.,LTD.
• KOSEI CHANKASEM CO.,LTD.
• GOLD PRESS INDUSTRY CO.,LTD.
• ASAHI TEC ALUMINIUM (THAILAND) CO.,LTD.
• OHASHI SATO (THAILAND) CO.,LTD.
• PAIN APPLICATION SYSTEMS CO.,LTD.
• MISUBISHI ELECTRIC CONSUMER PRODUCTS (THAILAND) CO.,LTD.
• THAI STANLEY ELECTRIC PUBLIC COMPANY LIMITED
• JAROONRAT ENGINEERING CO.,LTD.
• BOSCH AUTOMOTIVE (THAILAND) CO.,LTD.
• SNC PYONGSAN EVOLUTION CO.,LTD.
• THONBURI AUTOMOTIVE ASSEMBLY CO.,LTD.(SUBCONTRACT)
• DAIKYO COPRORATION(THAILANDA) LTD.
• THAI SAMSUNG ELECTRONICS CO.,LTD.
• SUMMIT SHOWA MANUFACTURING CO.,LTD.
• THAI KOITO COMPANY LIMITED.
• SIAM KUBOTA TRACTOR CO.,LTD.
• WASTE MANAGEMENT SIAM LTD.
• NIPPON OIL (THAILAND)LTD.
• TAIKISHA (THAILAND)CO.,LTD.
• PTT PUBLIC COMPANY LIMITED
• JANOME (THAILAND)CO.,LTD.
• SIAM KITO CO.,LTD.
• MIC INDUSTRIES (THAILAND) CO.,LTD.