Membership continued to grow steadily, with the foundry workers rejoining in 1962, and in 1975 it reached an all-time peak of 409,412 members.
After that, it gradually declined, despite the affiliation of the Swedish Miners' Union in 1994, and by 2005 the membership number stood at 276,068.
In January 2006, it merged with the Swedish Industrial Union to form IF Metall.
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