Ohtsuka Co., LTD, the parent company of O-Flex Group, Inc., was founded in 1921, as a family owned Japanese company and is engaged in a number of manufacturing and distribution businesses serving principally the automotive, industrial and medical markets.

• 1921 – Established Ohtsuka Co. LTD. located in Tokyo, JAPAN Manufacturing of automotive parts, air conditioning ducts for the construction industry and industrial machinery markets
• 1950 – Headquarters established in Shinagawa, Tokyo, JAPAN
• 1991 - Established Ohtsuka - Tech - Chiba No. 3 Plant, located in Chiba Prefecture. Manufacturing of automotive gaskets, industrial components and accessories.
• 1995 - Established Ohtsuka-Flex - Ichikawa Plant, located in Chiba Prefecture. Manufacturing of air conditioning ducts for the construction industry
• 1995 – Established Dalian Fuleikesi A/C Hose Co., LTD. Located in Dalian, China. Manufacturing air conditioning hose assemblies for the automotive market.
• 1996 – Established O-Flex, INC. located in Murfreesboro, TN. Manufacturing head impact energy absorption tubing.
• 1996 – Established AC-Flex - Chiba No. 1 Plant, located in Chiba Prefecture. Manufacturing air conditioning hose assemblies for the automotive market.
• 1996 – Established Pro-Flex - Chiba No. 2 Plant, located in Chiba Prefecture. Manufacturing insulated and heat resistant flexible tubes and head impact energy absorbing tubing.
• 2003 – Restructured O-FLEX, INC. into O-Flex Group, Inc., O-Flex Automotive, Inc., O-Flex Tube, Inc., O-Flex REES, LLC
• 2004 – Ohtsuka-Tech - Chiba No.3 Plant. Started manufacturing medical beds for Japanese market.
• 2005 - Constructed O-Flex plant #2 in Murfreesboro, TN. for manufacturing air bag tubular components, seat belt retractor components and HVAC hose applications for the automotive market.
• 2005 – Established Shanghai Flex  located in Fengxian near Shanghai, China. Manufacturing air conditioning hose assemblies and air bag tubular components.
• 2005 - Acquisition of O-Flex Metal Finishing Inc., a service operation providing zinc plating and E-coating.
• 2007- Acquisition of SEACO, offering fabrication, anodizing and brite dip of aluminum.