Profilati a caldo di acciaio a forma di T. Possono avere spigoli vivi ed altezza variabile da 20 a 50 mm (norma UNI 739-740), oppure spigoli arrotondati ed altezza variabile da 60 a 100 mm (norma UNI 731-732). Utilizzati, soprattutto i primi, per la realizzazione di edifici a struttura metallica, sono, in genere, accoppiati fra loro oppure con altre membrature.
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