An embodiment of the invention clamp assembly for a disk which includes a cavity for trapping the excess lubricant which migrates from the load bearing threads of the screws that hold the assembly in place. In a preferred embodiment a flexible structure, called a screw lubricant trap, is included between a clamp and hub. A recess for the screw lubricant trap is formed in one or both of the mating surfaces of the clamp and/or the hub. The screws are arranged in the interior of the screw lubricant trap, so that when the hub is spinning, the excess lubricant is forced into the cavity to keep the excess lubricant from migrating onto the disk. The screw lubricant trap is preferably made to be non-load bearing to avoid affecting the load on the screw. Alternatively, a groove can be machined in the clamp to serve as the lubricant trap.