The Castair Replacement Motor Hub with 5/8" Shaft (LX58) is the smallest shaft size in Cast Air's LX motor hub series, designed for compressor assemblies where the electric motor uses a 5/8" diameter output shaft. These are typically found on smaller single-phase compressor units — the kind you see running one or two air tools in a single-bay shop or light-duty service environment. Before ordering, measure your motor shaft with calipers. A 5/8" shaft measures 0.625" in decimal — if your shaft is larger, you need a different LX hub.
What the Motor Hub Does
The motor hub connects the motor's rotating shaft to the drive pulley or coupling that powers the compressor pump. On small compressors, this connection takes significant torque stress every time the motor starts — especially on compressors that start under load. A hub that's worn loose on the shaft causes the drive pulley to wobble, which throws off belt alignment, accelerates wear on the motor bearing and pump shaft seal, and creates vibration the whole unit feels. Replacing a worn hub is a straightforward repair that extends the life of both the motor and the pump.
Key Features
- 5/8" Shaft Bore: Machined for motors with 0.625" diameter output shafts — verify before ordering
- Cast Air OEM Part: Correct bore tolerance and dimensions for compatible Cast Air compressor models
- Precision Fit: Proper machining keeps the drive assembly running true without runout
- Direct Replacement: No modification required for compatible units
Technical Specifications
- Part Number: LX58
- Shaft Diameter: 5/8" (0.625")
- Component Type: Replacement Motor Hub
- Manufacturer: Cast Air
- Price: $19.25
Note: Manufacturer's product page was unavailable at time of writing. Contact us with your Cast Air model number to confirm compatibility before ordering.
When You Need This Part
- Hub is cracked or worn and the pulley has developed play on the shaft
- Compressor is vibrating or running louder than it should
- Belt slips or misaligns even with correct tension and sheave alignment
- Replacing a worn motor and need a hub to match the new motor's 5/8" shaft
- Annual maintenance on a smaller Cast Air unit
LX Series Hub Sizes
- LX58 — 5/8" shaft (this part)
- LX78 — 7/8" shaft
- LX100 — 1" shaft
- LX118 — 1-1/8" shaft
- LX138 — 1-3/8" shaft
Why Buy From OEM Diagnostic Tools?
We stock the full Cast Air LX hub series so you don't have to wait for a back-order from the factory. We've supplied shops with compressor replacement parts since 2016 — small parts included. Free shipping on qualifying orders. If you need help identifying the correct part number for your Cast Air unit, give us a call.
Call 866-217-0063 for quick answers and help!
