New Living Translation
Following that kingdom, there will be a fourth one, as strong as iron. That kingdom will smash and crush all previous empires, just as iron smashes and crushes everything it strikes.

American Standard Version
And the fourth kingdom shall be strong as iron, forasmuch as iron breaketh in pieces and subdueth all things; and as iron that crusheth all these, shall it break in pieces and crush.

Berean Study Bible
Finally, there will be a fourth kingdom as strong as iron; for iron shatters and crushes all things, and like iron that crushes all things, it will shatter and crush all the others.

Douay-Rheims Bible
And the fourth kingdom shall be as iron. As iron breaketh into pieces, and subdueth all things, so shall that break and destroy all these.

English Revised Version
And the fourth kingdom shall be strong as iron: forasmuch as iron breaketh in pieces and subdueth all things: and as iron that crusheth all these, shall it break in pieces and crush.

King James Bible
And the fourth kingdom shall be strong as iron: forasmuch as iron breaketh in pieces and subdueth all things: and as iron that breaketh all these, shall it break in pieces and bruise.

World English Bible
The fourth kingdom shall be strong as iron, because iron breaks in pieces and subdues all things; and as iron that crushes all these, shall it break in pieces and crush.

Young's Literal Translation
And the fourth kingdom is strong as iron, because that iron is breaking small, and making feeble, all things, even as iron that is breaking all these, it beateth small and breaketh.

Daniel 2:40 Additional Translations ...