The G-38 castings are especially recommended when ceiling systems are to be walkable or to carry dead loads such as process or utility racking or material handling systems. Gordon offers all of the 38-Series cleanroom ceiling systems iwth 3/8-16 right-hand/left-hand threaded rods and turnbuckles for suspension from building structure via 3/8-16 all thread. And the G-38 connectors mate perfectly with all of Gordon`s cleanroom ceiling extrusions, providing hte most comprehensive variethy of heavy-duty cleanroom ceiling solutions in the industry.