Abstract: A panel (1, 1?) for sectional doors presents a body having: a first longitudinal end (6) having a more outer substantially circular profile part (5) and a more inner narrow connecting part (10, 11, 17, 18, 19), and a second longitudinal end (7) opposite the first (6) and presenting a recess (8) of substantially circular narrow-mouthed shape (8A) arranged to matchingly receive the more outer part (5) of another panel having identical ends such as to couple and hinge the panels (1) together by simply inserting them manually and thrusting them in the direction of the panel height, or by inserting the the ends of the individual panels into each other by simply sliding them mutually in the direction of the panel length.