Union Autoparts Manufacturing Co., Ltd (UAM) belongs to the group of internationally recognized companies Okaya & Co. Ltd of Japan and Siam Steel Group. It is one of the most important manufacturers of high-quality steel rims and spokes for motorcycles in the world.

Union is a key supplier to most motorcycle factories in Southeast Asia. Some of these factories are listed below:

• 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 Inc., Philippines
• Suzuki Philippines Inc., Philippines
• Kawasaki Motor, Indonesia
• PT Yamaha Indonesia Motor
• Yamaha Motor, Taiwan
• Yamaha Motor Asia Pte. Ltd., Singapore
• Honda Turkey
• Iran Kawasaki