Custom Electrical Insulation Tubes and Bushings
We supply custom electrical insulation tubes, sleeves, bushings and spacers for fuse, motor, transformer, switchgear and coil assemblies. Material selection should follow the required electrical, thermal, mechanical and environmental duty—not a generic insulation rating.
Choose an insulation construction
| Product | Material focus | Common design reason |
|---|---|---|
| G5/G9 glass melamine tube | Melamine-resin glass laminate | Rigid, machinable insulation where G5 or G9 is specified |
| G7 silicone glass laminate tube | Silicone-resin glass laminate | Elevated-temperature service with a specified G7 construction |
| Insulating kraft paper sleeves | Convolute-wound electrical kraft paper | Lightweight winding support or internal electrical sleeve |
| Vulcanized fiber motor shaft bushing | Machined vulcanized-fiber bushing | Shaft isolation, spacing and drawing-based fits |
Engineering information to specify
- Material grade, governing standard and certificate requirements
- ID, OD, length, wall thickness and dimensional tolerances
- Dielectric test, voltage, creepage and clearance requirements
- Continuous and peak temperature, humidity and chemical exposure
- Mechanical load, shaft fit, concentricity and machining details
- Cleanliness, moisture control, packaging and inspection plan
RFQ checklist
Send the drawing or sample, material specification, dimensions, tolerances, operating conditions, required tests, quantity and packaging requirements. We will identify missing inputs and confirm manufacturability before quotation.
For products used directly in fuse assemblies, also review our fuse tubes material selection guide.
Frequently asked questions
What is an insulation tube used for in electrical equipment?
An insulation tube sleeves and separates conductive parts in switchgear, transformers, motors and fuse assemblies. It provides dielectric isolation while staying light and easy to machine to custom lengths.
Can you supply custom inside diameter, wall and length?
Yes. Dimensions, wall thickness and tolerances are reviewed against your drawing, and features such as cutting, drilling and threading can be added.
Request a quote
Send your drawing, voltage class, dimensions and quantity. Engineering review covers electrical, arc, moisture and mechanical requirements before production.