Union Autoparts Manufacturing Co., Ltd. (UAM) is a join-venture investment between Okaya & Co, Ltd of Japan and Siam Steel Group International and is one of the leading manufacturers of high quality steel wheel rims and spokes for motorcycles in the world. UNION is the main supplier of most motorcycle factories in Southeast Asia, such as:

• Thai Honda Manufacturing Co., Ltd.

• Thai Yamaha Motor Co., Ltd.

• Thai Suzuki Motor Co., Ltd.

• Kawasaki Motors Enterprise (Thailand)

• Honda Motor Co., Ltd., Japan Yamaha Motor, Ltd., Japan

• Yamaha Motor Sdn. Bhd., Malaysia MODENAS, Malaysia

• Honda Philippines Inc., Philippines Kawasaki Philippines