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metal rod; metal bar; iron rod; crowbar
iron club; iron staff with rings on top (traditionally used by night watchmen)
「鉄棒」 has another reading with different meanings.
工事現場で鉄棒を使ってコンクリートを砕いた。
At the construction site, a crowbar was used to break up concrete.
小学校の体育で鉄棒の技を練習するのが好きだ。
鉄棒 was important.
鉄棒で錠前をこじ開けた。
He pried open the lock with a metal rod.