| Ahresty Corporation | Nippon Light Metal Co., Ltd. | 
| Asahi Kinzoku Kogyo Co., Ltd. | Nippon Mining &. Metals Co., Ltd. | 
| Benkan Corporation | Nippon Steel Welding Products &. Engineering Co. | 
| Chuo Spring Co., Ltd. | Nishi Nippon Electric Wire &. Cable Co., Ltd. | 
| Daiki Aluminium Industry Co., Ltd. | Nuclear Fuel Industries, Ltd. | 
| Dowa Ironpowder Co., Ltd. | Occ Corporation | 
| Dowa Mining Co., Ltd. | Piolax, Inc. | 
| Fujikura Ltd. | Ryobi Ltd. | 
| Furukawa Electric Co., Ltd. | Sanwa Shutter Corporation | 
| Gifu Seiki Kogyo K. K. | Se Corporation | 
| Hitachi Powdered Metal | Shibazakj Seisakusho, Ltd. | 
| Horie Metal Co.,Ltd. | Shin-Etsu Handotai Co., Ltd. | 
| Japan Crown Cork Co., Ltd. | Showa Aluminum Corporation | 
| Japan Nuclear Fuel Limited | Showa Electric Wire &. Cable | 
| Jone Crane Japan, Inc. | Sumitomo Electric Industries | 
| Kanematsu Metals Ltd. | Sumitomo Light Metal Industries, Ltd. | 
| Kdk Corporation | Sumjtomo Metal Mining Co. | 
| Kikuchi Co., Ltd. | Sumitomo Sitix Corporation | 
| Kobe Steel, Ltd. | Suncall Corporation | 
| Komatsu Electronics Metals | Suzukj Metal Industry Co., Ltd. | 
| Marubeni Metal Corporation | Tanaka Kjkinzoku Kougyo | 
| Meira Corporation | Toho Titanium Co., Ltd. | 
| Mitsubishi Cable Industries, Ltd. | Tokusen Kogyo Co., Ltd. | 
| Mitsubishi Materials Corp. | Tokyo Tungsten Co., Ltd. | 
| Mitsubishi Materials Silicon Corporation | Tostem Corporation | 
| Mitsubishi Shindoh Co., Ltd. | Totoku Electric Co., Ltd. | 
| Mitsui Aluminium Company, Ltd. | Toyama Light Metal Industry Company, Ltd. | 
| Mitsui Mining &. Smelting Co. | Toyo Aluminium K.K. | 
| Nakashima Propeller Co., Ltd. | Toyo Seikan Kaisha,Ltd. | 
| Nasu Denkj-Tekko Co., Ltd. | Tyton Company Of Japan, Limited | 
| NHK Spring Co., Ltd. | Yokohama Hydex Co. |