SENJU METAL INDUSTRY
Japanese manufacturer of soldering materials, soldering equipment, and related metal products.
Last updated September 16, 2026
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Overview
Senju Metal Industry Co., Ltd. is a Japanese company founded in 1938 as Senju Lead Works and renamed Senju Metal Industry Co., Ltd. in 1944. It manufactures soldering materials such as solder alloys, solder paste, flux, and solder balls, as well as FA equipment including reflow furnaces and flow soldering machines, and other products such as multilayer sliding bearings and plating anodes. The company has expanded internationally with manufacturing and sales bases in China, Malaysia, the United States, Thailand, South Korea, and the Czech Republic.
History
Senju Metal Industry Co., Ltd. was founded in 1938 as Senju Lead Works. In 1939 it began production of thread solder, bar solder, rosin-cored solder, and water supply lead pipes. In 1944 it changed its name to Senju Metal Industry Co., Ltd. In 1956 it obtained JIS standard indication permission for solder at its head office. In 1963 it succeeded in domestic production of sprinkler heads for fire extinguishing systems and obtained the first type approval from the Fire Research Institute. In 1966 it opened a business office in Moka, Tochigi Prefecture. In 1977 it developed silver-core solder balls. In 1979 it developed the oil-free bearing Clean Metal. In 1980 it completed its first fully automatic soldering machine. In 1982 it completed its first reflow furnace. In 1985 it exported solder manufacturing plants to China and entered technical tie-ups. In 1990 it established manufacturing and sales bases in Malaysia and newly built the Iwate Factory (Marumori) for Senju Sprinkler. In 1997 it established Senju Comtek Corp. in California, USA. In 2001 it launched M705, which became a JEITA standard lead-free material. In 2002 it began full-scale production in Huizhou, China, and established Senju Micro Technology Research Institute (now Senju Giken Co., Ltd.). In 2004 it established SENJU METAL (THAILAND) CO., LTD. In 2005 its new head office building was completed. In 2006 it established SENJU KOREA CO., LTD. In 2012 a new research building and Nisshin-ro were completed on the head office grounds. In 2014 it became a full member of EICC/CFSI. In 2015 it declared completion of conflict-mineral-free status and launched the industry's first Sn-Bi flux-cored solder 'LEO'. In 2017 SENJU MANUFACTURING EUROPE S.R.O. began operations in the Czech Republic.
Products and positioning
M705 lead-free solder
Lead-free JEITA standard material launched in 2001.
LEO Sn-Bi flux-cored solder
Industry's first Sn-Bi flux-cored solder launched in 2015.
M773 silver-free solder
Silver-free solder product developed in 2014.
M794 automotive high-reliability soldering material
Alloy developed for automotive high-reliability soldering in 2013.
Recent events
- Unconfirmed
Senju Metal Industry closes High Wycombe factory[6]
Reported:
Senju Metal Industry closed its High Wycombe manufacturing plant; the owners cited disruption from Brexit as the reason.
Sources6 sources
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