Lovejoy L100 Jaw Coupling Hub, 1/2 in Bore
This is the 1/2 in bore hub for a Lovejoy L100 jaw coupling, the sintered iron workhorse of the L-Series line and one of the most widely used coupling styles in marine and industrial drive systems. Like every L-Series hub, it is machined with curved jaws that mesh with a flexible spider rather than bolting directly to the mating hub, which lets the coupling take up minor shaft misalignment without transmitting that stress into the motor or pump bearings.
A jaw coupling that starts to knock, rattle, or show excess backlash on startup almost always needs a new spider rather than a new hub, but a hub does eventually need replacing if the jaws chip or round off from prolonged running with a degraded spider, or if the bore has worn oversized from a loose set screw. Because this hub is bored to 1/2 in, check it against the shaft with calipers rather than assuming the old part number is still correct, especially on equipment that may have been repaired or re-shafted in the past.
Key Features
- Sintered iron hub built to Lovejoy L-Series dimensions and jaw geometry
- 1/2 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
- Splits into two hubs and a spider for simple field service and spare-parts stocking
- Interchangeable with any other genuine L100 hub and spider of the same size class
Applications
- Motor-to-pump and motor-to-gearbox shaft connections on marine and industrial equipment
- Generator, compressor, and blower drive couplings
- General industrial and marine power transmission wherever a Lovejoy L100 coupling is specified
- Higher-torque and higher-duty-cycle drives where the added mass of an iron hub over an aluminum hub is not a concern
Specifications
- Brand: Lovejoy
- Series / Size: L100
- Part Type: Jaw Coupling Hub
- Hub Material: Sintered iron
- Bore Diameter: 1/2 in
- Maximum Bore for This Size: 1-3/8 in
- Hub Outside Diameter: 2.53 in
- Hub Overall Length: 3.46 in
- Mounting: Set screw
- Nominal Torque Rating (standard NBR spider): 417 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: Can I mix an L100 hub with an AL100 hub in the same coupling?
The two share the same size class and jaw geometry, but pairing iron and aluminum hubs is not the standard configuration. Keep the pair matched in material unless it has already been confirmed suitable 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. Do not attempt to bush down a bore that is too large; order the correct bore size instead.
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.
Q: How is the hub secured to the shaft?
A set screw seated over the shaft locks the hub in place. Re-torque the set screw after the first few hours of run-in and check it periodically after that.
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.
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