Definition of transition fit in English:

transition fit

noun

Engineering
  • A fit between two parts in which the width of the inner part is the same as or slightly exceeds that of the hole or socket into which it is inserted, requiring light force to assemble and disassemble.

    Frequently contrasted with
    clearance fit
    and "interference fit", between which it is considered an intermediate class.

Origin

Early 20th century; earliest use found in The Engineer.