Universal joint comprising: - a first band, - a second band, the two bands (102a-b) being cylindrical bands coaxial with one another with respect to a common axis, the first band and the second band being separated by a slot, - a first and a second stiffener (108a-b) which extend inside the bands (102a-b), the first stiffener extending in a first radial plane containing the common axis, the second stiffener extending in a second radial plane orthogonal to the first radial plane and containing the common axis, each stiffener (108a-b) having a first end and a second end, the first and second ends of the first stiffener being joined to the first band, and the first and second ends of the second stiffener being joined to the second band, - a stem which is coaxial with the common axis and of which a first end is joined to the first stiffener and of which a second end is joined to the second stiffener, - a crown that is coaxial with the common axis and surrounds the stem, - four torsion bars (106a-b) which extend inside the bands (102a-b) in a single plane P perpendicular to the common axis and are distributed at regular angular intervals of 90° around the common axis, a first torsion bar extending in the first radial plane and having a first end joined to the first band and a second end joined to the crown, a second torsion bar extending in the second radial plane and having a first end joined to the second band and a second end joined to the crown, a third torsion bar extending in the first radial plane and having a first end joined to the first band and a second end joined to the crown, and a fourth torsion bar extending in the second radial plane and having a first end joined to the second band and a second end joined to the crown. - a first band, - a second band, the two bands (102a-b) being cylindrical bands coaxial with one another with respect to a common axis, the first band and the second band being separated by a slot, - a first and a second stiffener (108a-b) which extend inside the bands (102a-b), the first stiffener extending in a first radial plane containing the common axis, the second stiffener extending in a second radial plane orthogonal to the first radial plane and containing the common axis, each stiffener (108a-b) having a first end and a second end, the first and second ends of the first stiffener being joined to the first band, and the first and second ends of the second stiffener being joined to the second band, - a stem which is coaxial with the common axis and of which a first end is joined to the first stiffener and of which a second end is joined to the second stiffener, - a crown that is coaxial with the common axis and surrounds the stem, - four torsion bars (106a-b) which extend inside the bands (102a-b) in a single plane P perpendicular to the common axis and are distributed at regular angular intervals of 90° around the common axis, a first torsion bar extending in the first radial plane and having a first end joined to the first band and a second end joined to the crown, a second torsion bar extending in the second radial plane and having a first end joined to the second band and a second end joined to the crown, a third torsion bar extending in the first radial plane and having a first end joined to the first band and a second end joined to the crown, and a fourth torsion bar extending in the second radial plane and having a first end joined to the second band and a second end joined to the crown.