Vulcanized Fiber Motor Shaft Bushing
Vulcanized fiber motor shaft bushing is a machined insulating sleeve or spacer fitted between a shaft and the surrounding component. It is used when the motor design specifies electrical isolation together with a lightweight, machinable fiber part.
Fit and drawing requirements
| Design point | Confirm before production |
|---|---|
| Shaft interface | Nominal shaft diameter, fit type, interference or clearance and installation method |
| Bushing geometry | ID, OD, length, wall thickness, chamfers, shoulders and slots |
| Tolerances | Roundness, concentricity, runout and finished-size inspection method |
| Service duty | Rotational speed, load, temperature rise, humidity and electrical isolation need |
| Assembly | Press-fit force, adhesive use, mating materials and prototype validation |
Typical applications
- Motor shaft insulating bushings and spacers
- Electrical isolation sleeves for rotating assemblies
- Custom machined vulcanized-fiber washers, collars and tubes
RFQ checklist
Send the finished-part drawing or sample, shaft diameter, fit requirement, ID, OD, length, geometric tolerances, operating speed, load, temperature, quantity and inspection plan. Prototype fit and runout should be approved in the actual assembly before volume production.
For unmachined tube stock, see our vulcanized fiber tube. For paper-based winding supports, see insulating kraft paper sleeves.
Frequently asked questions
What is a vulcanized fiber motor shaft bushing?
It is a machined sleeve made from dense vulcanized fiber that fits over a motor shaft to provide electrical insulation, wear resistance and a precise bearing seat.
Can motor shaft bushings be machined to tolerances?
Yes. The material is easily turned, bored and threaded, so inside diameter, outside diameter and length are finished to the approved drawing.
Request a quote
Send your drawing, voltage class, dimensions and quantity. Engineering review covers electrical, arc, moisture and mechanical requirements before production.