Utilizing hysteresis technology to provide continuous, contactless, impact-free torque, ROBA®-capping heads apply screw caps made of plastic with repetitive accuracy of ± 2%. Wear-resistant plastic/stainless steel linear guide, which is lubricated for lifetime of product, minimizes necessary servicing. With ROBA®-capping heads, limit torque can be continuously adjusted and can be read off directly via scale. Enclosed construction makes capping heads resistant to dirt and aggressive media.