Katayama’s upper sash assemblies are engineered to meet the exacting standards of global OEMs. With advanced robotic welding and high-precision metal finishing, we deliver structural components that enhance vehicle performance and styling. As a Tier 1 supplier with deep expertise in door frame systems, Katayama ensures exceptional fit, strength, and consistency at scale.

Our lower sash assemblies provide critical structural support within the vehicle door system. Leveraging automated production and stringent in-line inspection, Katayama ensures high-performance assemblies that meet program requirements while supporting streamlined integration across global platforms.

We leverage advanced manufacturing techniques, including roll forming and automated welding of supplementary brackets and fasteners, to produce glass guide channels that offer exceptional alignment and quality. Our expertise extends from design to engineering, creating tailored solutions that meet the exacting demands of automotive manufacturers, ensuring seamless integration with the vehicle's glass system for an unparalleled finish.