Expansion Sleeves

Expansion sleeves are mechanical locking elements designed for keyless shaft-hub connections. They rely on tapered surface engagement and axial bolt tightening to generate strong radial pressure, forming a secure frictional fit. This method avoids keyway machining, reduces stress concentration on the shaft, and allows for easy assembly and disassembly. They are commonly used to fix gears, couplings, pulleys, and sprockets onto shafts.

An expansion sleeve typically consists of an inner ring, outer ring, and tapered contact surfaces. When bolts are evenly tightened, axial movement creates a uniform radial force that locks the sleeve in place. The backlash-free connection resists vibration and torque fluctuations, making it suitable for heavy-duty or high-start-stop equipment such as metallurgical machinery, packaging lines, conveyor systems, paper production machines, and wind power drives.