There are many different sizes and shapes of phosphor bronze Alloy C51900 fasteners available, including plain washers, split lock washers, dowel pins, threaded rods, hex nuts, screws, stud bolts, and standard hex bolts. Aerospace, the construction of marine equipment, the manufacture of chemical processing equipment, etc. all employ Alloy C51900 fasteners. Phosphor bronze fasteners are made by Resistant Metal Alloys in both metric and imperial systems.