Aluminum-Body Steel-Mandrel Rivet AB4-6A .313-.375-in Grip

The Howmet / Marson BR4-6ASD (M40321) is an AB4-6A style blind rivet featuring an aluminum body (alloy 5056) and a steel mandrel. It has a nominal diameter of 1/8-inch (0.125 in) and a large grip range of 0.313-0.375 inches (≈ 7.95-9.53 mm). With a dome (button) head, plain aluminum finish, and steel mandrel (zinc clear trivalent finish), this rivet combines corrosion resistance of aluminum with extra strength provided by the steel mandrel. It is intended for blind fastening where access is only on one side, and materials of moderate thickness must be joined reliably.