These nuts are Grade 5 (Ti-6Al-4V) titanium and are TRUE TITANIUM(TM). They are stronger, lighter and completely corrosion free, even in saltwater. These are structural, aerospace grade nuts with a minimum yield strength of 128,000 psi (880 Mpa). If you are a drag racer, these are the nuts you want holding your dragster together. If you are a sailboat racer, these are the nuts you want holding your mast up. They are completely different than stainless steel, over three and a half times stronger while weighing 44% less. TRUE TITANIUM(TM) is a trademark to establish that this product is manufactured from solid Titanium, rather than a coating, plating or color. TRUE TITANIUM, the AT Logo, the Ring around our high strength screws, LOOK FOR THE RING, AFFORDABLE TITANIUM NOW and ALLIED TITANIUM are all trademarks of Allied Titanium, Inc.