DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   check nut /tʃˈɛk nˈʌt/
   Gegenmutter <fem>, Kontermutter <fem> [techn.]
      Synonyms: counter nut, jam nut
    see: counter nuts, check nuts, jam nuts