The Steel Key is a 1953 British second feature 'B'[1] thriller film directed by Robert S. Baker and starring Terence Morgan, Joan Rice and Raymond Lovell.

Adventurer Johnny O'Flynn attempts to track down thieves who have stolen a secret military formula for producing hardened steel; but ruthless others who will stop at nothing are also on the trail.

The Monthly Film Bulletin said "An indifferent thriller, whose stock characters and situations fail either to convince or to excite.

The plcture occasionally allows its lively sense of humour to remove the edge off some of its thrills, but otherwise it's hearty, actionful and disarmingly ingenuous 'Boys’ Own Paper'.

"[5] Allmovie wrote, "a little-known British melodrama with some potent talent involved, including actors Terence Morgan and Joan Rice and future Saint director Robert Baker".