Product Info Made by Robust Tools. This 4.5″ vacuum chuck is machined by Robust Tools from solid 6061 Aluminum. The polymer seal has multiple sealing ridges and is 3D printed. The chuck is threaded 1-1/4″ x 8 TPI and comes with a Tommy-bar for removal. This midsize vacuum chuck is probably your best all-around choice. With a vacuum of 20-25″ of mercury, this chuck should provide approximately 135 to 170 lbs. of holding force. Look to the other sizes vacuum chuck for more options.
