I figure that all the gearheads hang out in SAR, we ought to share resources on reading material. Here's a downloadable PDF from NASA on fasteners - nuts, bolts, threaded inserts, nut plates, lock washers, rivets, it's all there. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900009424_1990009424.pdf If you like that kind of stuff, I can't recommend highly enough Carroll Smith's books, specifically, "Engineer To Win" and "Nuts, Bolts, Fasteners and Plumbing Handbook" --- unofficially known as "Screw To Win". http://www.carrollsmith.com/books/ Anyone else have suggestions? I haven't noticed too many e-Books on gearhead topics... anyone have links to those?