TF51 is a type of spherical hinged internal installation style flat cap routel with dust-proof function, the dust-proof cover cam prevent the dust from entering the internal of the routel. At the same time, the base can rotate with the spherical head bolt which can reduce the bending moment effect of the glass at the point of the external load. It is widely used in the point-fixed glass curtain wall projects, such as the point-fixed glass curtain wall, point-fixed glass canopy, point-fixed glass skylight and so on.