15T Stainless Steel Worm Gear Screw Jack feature AISI 304 as standard for all components, including the threaded spindles, covers, bushings, casings, end fittings and motor flanges. The stainless steel screw jacks series can be applied in marine environments where oxidising is a problem. stainless steel screw jacks are ideal for applications where a permanent resistance to oxidising is a requirement.