Model ID: Ultrabond 821McCoy offers Bonding Agents, Ultrabond 821. It is for cylindrical bonding. It improves machine reliability by strengthening the shaft and sleeve assembly. It lowers cost with scope for wider machining tolerances. It fills the microscopic voids that are inherently present in even the best inference fits and hardens to strengthen the assembly. The metal cement undergo anaerobic (absence of oxygen) curing when confined between mating metal surfaces.