STEMS™ fasteners are another innovative design from ITW Shakeproof, utilizing a screw and washer assembly with a unique anti-compression stamped washer. They are specifically designed for capturing plastics, tubings, grommets, gaskets and other soft materials to steel. When designed for your application, STEMS™ fasteners will prevent cracking, loosening due to creep, and overcompensation of the plastic material. They are highly versatile, as any type of screw may be used in the assembly, and are available in a variety of head styles, point styles, and thread forms, in sizes M3.5 to M8.