Lovejoy AL110 Aluminum Jaw Coupling Hub, 1 3/8 in Bore
The Lovejoy AL110 is an aluminum half of a two-piece jaw-type shaft coupling, built to connect a motor, pump, or gearbox shaft to its mating equipment while absorbing the small amounts of angular, parallel, and axial misalignment that show up in almost every real-world installation. This hub is bored to 1 3/8 in and secured with a set screw, and it pairs with a second AL110 hub and a flexible elastomer spider to complete the coupling. Because the hub is machined from aluminum rather than cast or sintered iron, it weighs a fraction of what the same size iron hub weighs and shrugs off the corrosion that salt air and washdown water cause on a boat or dockside pump station.
Jaw couplings are intentionally designed to fail safe: the rubber spider between the two hubs is the sacrificial wear part, and if it degrades from age, heat, or overload, the jaws of the two hubs will interlock and keep the shafts turning rather than letting the drive disconnect without warning. The aluminum hubs themselves rarely wear out under normal use, but they do get replaced after a shaft strike, a bore damaged by a slipping set screw, or when upgrading from a worn or incorrect bore size. Confirm the shaft diameter and the coupling size stamped on the old hub before ordering, since AL110 hubs are not interchangeable with a different size class.
Key Features
- Aluminum construction for roughly half the weight of an equivalent cast iron hub
- 1 3/8 in finished bore secured with a set screw
- Fail-safe jaw design keeps the shafts turning if the elastomer spider ever fails
- No metal-to-metal contact between hubs during normal operation, which limits vibration transfer
- Naturally corrosion resistant, well suited to damp, salt-exposed marine environments
- Interchangeable with any other genuine AL110 hub and spider of the same size class
Applications
- Motor-to-pump and motor-to-gearbox shaft connections on marine and industrial equipment
- Generator and compressor drive couplings where light weight matters
- Deck washdown, bilge, and raw water pump drives exposed to salt air and moisture
- General power transmission wherever a Lovejoy AL110 coupling is specified
Specifications
- Brand: Lovejoy
- Series / Size: AL110
- Part Type: Jaw Coupling Hub
- Hub Material: Aluminum
- Bore Diameter: 1 3/8 in
- Maximum Bore for This Size: 1-5/8 in
- Hub Outside Diameter: 3.31 in
- Hub Overall Length: 4.25 in
- Mounting: Set screw
- Nominal Torque Rating (standard NBR spider): 792 in-lb
- Maximum Speed: Up to 1,750 RPM with the standard NBR spider (to 3,600 RPM with an optional urethane or Hytrel spider)
- Quantity Per Coupling: 1 hub (mating hub and spider sold separately)
- Condition: New
Frequently Asked Questions
Q: Do I need two of these hubs to build a complete coupling?
No. A complete AL110 coupling needs one hub on the driving shaft, one hub on the driven shaft, and one elastomer spider between them. This listing is for a single hub, and it is common for the two shafts to need different bore sizes.
Q: Can this hub be used with a cast iron L110 hub on the other shaft?
The AL110 and L110 share the same size designation and jaw geometry, but the two hub materials are not the standard pairing. Keep the pair matched in material unless a mismatch has already been confirmed acceptable for the application.
Q: What happens if the bore is larger than my shaft?
An oversized bore will not grip the shaft correctly even with the set screw tightened, so the hub bore needs to match the shaft diameter as closely as the set screw and any keyway allow. Do not attempt to bush down a bore that is too large.
Q: Is a keyway included on this bore size?
No, this bore is supplied without a keyway and relies on the set screw alone. A keyway can be added by a machine shop if the application calls for it.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct coupling hub.
CLRMarine
