Joining system for floor panels with improved locking means

The invention relates to Joining system for floor panels (1) provided with coupling parts (20) on at least two opposite sides (30， 40) for joining floor panels (1) together. The coupling parts (20) include a groove (50) and a tongue (60)， where the groove (50) is shaped for insertion of a tongue (60) on an adjoining floor panel (1). The invention is especially characterized in that the locking means (70) comprises dual consecutive locking recesses (80， 90) arranged in a lower portion (95) of the groove (50) and dual consecutive locking lugs (130， 140) arranged in a lower portion (150) of the tongue (60) for horizontally interlocking engagement with said dual consecutive locking recesses (80， 90).