We found 3 dictionaries that define the word square nuts:

General (1 matching dictionary)

1. square nuts: Vocabulary.com

Tech (2 matching dictionaries)

2. AUTOMOTIVE TERMS (No longer online)
3. Glossary of Fastener Terms (No longer online)

(Note: See square_nut as well.)

Definitions from Wikipedia (Square nut) ▸ noun:  A square nut is a four-sided nut. ▸ Also see square_nut ▸ Words similar to square nuts ▸ Usage examples for square nuts ▸ Idioms related to square nuts ▸ Wikipedia articles (New!) ▸ Words that often appear near square nuts ▸ Rhymes of square nuts ▸ Invented words related to square nuts