| 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. |
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