Antique oil tank fasteners; nuts; bolts. And shadows; Signal Hill; California. Nuts and bolts would be replaced with rivets and eventually welding as a means of joining steel plates to form cylindrical
Antique Bolt [Restoration] - YouTube
Mac's Antique Auto Parts Model A Ford Running Board Bolt Set - 24 Pieces - Special High Crown Bolts & Nuts & Washers | Ford | 1928-1929
4 Bolts Screws & Nuts French Antique Bed Or Other Old Furniture Unused 2-1/4" | eBay