Abstract: Tube clamps for use in fastening tubes to stationery support structures and particularly adapted for use in nuclear power plants and in other installations wherein a relatively large number of tube runs are involved requiring a relatively large number of tube clamps. The main embodiment of the invention provides a tube clamp assembly which is adapted to alternatively receive tubes of different sizes so that, for example, one tube clamp may be employed for two or more tube sizes thus reducing the number of units to be held in inventory. Another form of the invention permits the tube clamp assembly to be employed in a two-directional or three-directional manner as these terms are used in the industry.

Abstract: A tube clamp includes a pair of clamping members. One of the members is adapted to be fixedly secured as by welding to a stationary surface and the other bolted to the fixed member. The fixed member is formed with recesses complementarily formed relative to the heads of bolts used to clamp the two members together thus providing captive bolts.Interengaging elements on the members prevent clamping the two members together except when the members are in a fixed relationship.