3/ 4" Harvester Lokâ„¢ Friction Hub The keyless frictional locking device family provides a high capacity, zero-backlash shaft-to-hub or coupling connection by means of a mechanical interference fit. FEATURES * Uniform Pressure Distribution * Fittings for Smaller Shafts * Keyless Hub * No Space Between Sprocket and Shaft * Hex-head Set Screws SPECIFICATION See the 3/ 4" Harvester Lokâ„¢ Friction Hub document for part number, bore, rim and hub and other information.