Outboardnut and Mumbles, Thank you for the info. I just assumed that if an insert is magnetic, it is not stainless steel. My inserts are from a HeliCoil kit but they are magnetic. Looked it up and found this on the Portland Bolt website so learned something new. 🙂
“The most common stainless steels, 304 and 316, have an austenitic microstructure and start out life non-magnetic. However as they are manufactured from raw steel to fasteners, they go through several cold forming processes (drawing, roll threading, heading) which changes the microstructure from austenitic to martensitic, thereby making the material more magnetic. The more cold forming, the more its microstructure is changed to martensite, and subsequently the more magnetic the fastener is likely to be.”
Thanks again.