Five Functions of a Variable Diameter Sleeve
A variable diameter sleeve adapts a smaller or different tool shank to a larger holder bore, allowing one clamping system to accept multiple cutter sizes. The sleeve centers the shank, distributes clamping pressure, increases contact area, and helps transfer torque without marking the tool. A correctly matched sleeve also reduces setup changes and supports better runout control, rigidity, and repeatability.
Select the sleeve outside diameter, inside diameter, length, slot design, material, and tolerance for the holder and shank. Keep the sleeve, tool holder, and cutter clean, dry, and free of burrs. Insert the shank to the correct depth, align any slots as specified, tighten to the recommended torque, and check runout before machining. Do not stack sleeves or use a damaged adapter. Correct selection improves clamping security, accuracy, productivity, and tool life in collet systems.
