Shaft Locking Devices
- Connects hubs solidly to shafts using keyless mechanical interference fit
- Wide selection available – 9 types; internal and external devices
- Easy device installation and removal

Resources
Shaft Locking Devices Product Information
Lovejoy Shaft Locking Devices connect hubs solidly to shafts, using a keyless mechanical interference fit, to transmit torque or to withstand axial thrust. This mechanical interference fit utilizes screw tension in the Shaft Locking Device, converted into radial pressure via an inclined plane. This pressure expands the Shaft Locking Device to eliminate the gap between the hub and the shaft. The Shaft Locking Device uses the friction bond between the Shaft Locking Device and the shaft/hub to create a zero backlash connection. This connection is easily releasable to remove the mechanical interference fit.
Shaft Locking Devices expand to fill the gap between the shaft and hub, allowing for easy installation and removal, saving time over traditional interference fit techniques. The contact pressures created using a Shaft Locking Device can be greater than traditional interference fit pressures, allowing for more torque to be transmitted or shorter hubs to be used. The easy installation also allows the hub to be positioned more accurately on the shaft, and can facilitate angular timing of the hub.
Shaft Locking Devices Additional Resources
Lovejoy has an extensive collection of both internal and external shaft locking devices.
Versus Traditional Keyed connections
- No Backlash due to fit tolerances
- No impact effect from reversing loads
- Ability to adjust axial position and angular timing
- No fretting corrosion due to movement at the fit interface
Versus Traditional Interference fits
- Easier and quicker to install
- Higher contact pressures can transmit greater torques
- Easy and quick to remove without damaging the shaft or hub – even after years of service
Design Benefits
- Eliminate cost of machining keyways or splines
- Reduce the shaft stress by removing keyways or splines
- Eliminating keyways often allows the use of a smaller diameter shaft
- Can place anywhere on shaft, and allows for easy angular timing
- Easy removal without damaging the shaft or hub means easier maintenance for the customer
Example Applications
Bevel gears, braiding machines, brake drums, cardboard making machines, carpet making machines, chocolate making machines, clutches, compressors, conveyor pulleys, conveyors, couplings, crushers, fans, flanges, flywheels, footwear machines, gearboxes, reducers, and gear motors, graphic machines, helical gears, industrial sewing machines, lamination machines, levers & cams, meat & fish processing machines, mechanical presses, milk processing machines, milling & drilling machines, mixer shafts, moving sidewalks, packaging machines, pasta machines, printing machines, pulp industry: drive rolls & cylinders, pump impellers & turbine rotors, rolls, section bar machines, shaker screens, sheaves, ski lifts, speed reducers, sprockets, thermal pumps, tobacco machines, vegetable-oil refining machines, weaving machines, winches, wind generators, and worm gears.
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SLD 900
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SLD 1500
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SLD 1850
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SLD 1750
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SLD 1350
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SLD 1450
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SLD 2600
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SLD 1900
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SLD 350
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