I got these bolts from a guy that parts out airplanes. They are so pretty I hate to see them get thrown away so I look for something to do with them on my farm or race cars or in the shop. The reason I was wondering about the material is I was hoping I could shorten some of them to use on my drag car but the material is so hard I will probably have to give up on that idea. Thank you for your help. And no they won't be going on airplanes.