Harper Corporation has recently released Harper Bridge Sleeves, which utilize carbon fiber to maximize stiffness and reduce weight. The Harper Bridge Sleeve Flow-Thru feature allows secondary air to permeate the system to make it easy to mount plate sleeves or ITR plates. The patent-pending replaceable notch system can incorporate a straight, bayonet or custom notch design, allowing for use with a variety of presses. They can be used with steel or carbon fiber-based mandrels, as well as hydraulically clamped or mechanical lockdown systems. A mechanically fastened end ring incorporates a built-in sleeve stop, and Harper Bridge Sleeves offer a notch to locate pin tolerances +/- 0.0015" in relation to locating pin.
Charlotte, NC USA