How many letters does the top answer for “any of various rotating shafts that serve as axes for larger rotating parts” have?

The most common answer is mandrel (7 letters).

Crossword clue: any of various rotating shafts that serve as axes for larger rotating parts

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

mandrel 7 letters wn-def

any of various rotating shafts that serve as axes for larger rotating parts

mandril 7 letters wn-def

any of various rotating shafts that serve as axes for larger rotating parts