North Nippon Works Muroran Works

North Nippon Works Kamaishi Area

East Nippon Works Kashima Area

East Nippon Works Kimitsu Area

East Nippon Works Naoetsu Area

Nagoya Works

Kansai Works Wakayama Area (Wakayama / Kainan / Sakai)

Kansai Works Amagasaki Area

Kansai Works Osaka Area

Setouchi Works Hirohata Area

Setouchi Works Kure Area

Setouchi Works Hanshin Area

Kyushu Works Yawata Area

Kyushu Works Oita Area (Oita / Hikari Pipe Kyushu Works Oita Area & Tube Div.)