A clamp for a sanitary fitting includes a first and a second semicircular part that are circumscribed by a flexible cable tie. Each semicircular part has a concave side and a convex side. A channel is formed in each concave and each convex side. The concave channels accommodate a flange of a sanitary fitting when the first and second semicircular parts are disposed in confronting relation to one another. The cable tie positioned in the convex channels circumscribes the confronting semicircular parts. A cable tie catch slidingly receives a free end of the cable tie when the cable tie circumscribes the first and second semicircular parts. A marker on the cable tie registers with the catch or another marker on the cable tie when the cable tie is under a predetermined amount of tension to ensure that the same amount of tension is consistently applied to the cable tie.