Quoted:
Bolts are not available in stainless steel.

made out of carpenter-grade steel

Quoted:
Steel that carpenters use? I dont know.

Over the years, Carpenter and other steel fabricators have developed different alloys of precision strip for specific applications. For example, cobalt-iron alloys provide a very strong magnetic field that is critical in making aircraft generators. Manufacturers use strips of cobalt-iron alloys to make high-strength rotors that deliver electrical energy to auxiliary power units and guidance systems on aircraft.

"Many of the nuts used to hold aircraft together are made of A-286 steel alloy strip. This alloy is made up of 26 percent nickel, enabling them to withstand temperatures as high as 2,000°F," explained Sunil Widge, a metallurgist who is vice president of technology and quality at the mill.

Metallurgists also use the high nickel alloys to fashion prototype magnetic bearings, a promising component yet in its infancy. "The aerospace industry is interested in using magnetic bearings to develop noncontact shafting that will not wear. These alloys generate the high magnetic field and possess the low weight this application requires," Widge said.