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. As a direct manufacturer and supplier, we provide insulation tubes in made-to-drawing sizes with low minimum order quantities and fast sampling for both prototype and production runs.
Choose an insulation construction
Match the grade named on the drawing first, then check dimensions and machining. Each product page lists the current size options and the inputs we need to quote.
| 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 |
Insulation tube or fuse tube
These two families solve different problems. Insulation tubes isolate and separate conductive parts in motors, transformers, switchgear and coils. Fuse tubes carry the arc and interrupting duty inside the fuse itself. If your component sits in the fuse body, start with the fuse tubes selection guide; for layered fuse constructions, use the composite fuse tubes guide.
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.
Related technical guides
These articles cover the applications where insulation tubes and adjacent components are specified:
- G5 and G9 melamine tube line
- Hard fiber tubes for fuse or motor use
- Kraft paper sleeves, spiral and convolute winding, and vulcanized fiber tube
- Seven uses for filament wound tubing
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.
One plant across the whole insulation tube range
This page covers a range rather than a single construction, and the practical advantage of buying it from one plant is that the material recommendation is not tied to what a distributor happens to hold. If the duty points to melamine rather than filament wound, or to vulcanized fibre rather than paper, the choice is made on the requirement instead of on stock.
- Direct-from-plant pricing across the insulation tube range
- Prototype quantities accepted while the construction is chosen
- Dimensions and machining per specification, whatever the material
- ISO 9001 quality system covering every construction on this page
- SGS material testing available on the selected material
- RoHS and REACH documents on request
Insulation tube: choosing and ordering
How do I order a mixed set of insulation tubes?
Send the drawing set and the duty for each part. Prototype and trial quantities are accepted, so the constructions can be compared before any volume commitment.
Do all the constructions share the same quality system?
Yes. Every tube, sleeve and bushing on this page is made under an ISO 9001 quality system, with SGS material testing available and RoHS and REACH documents issued on request.
How long does a mixed enquiry response take?
An engineer answers within one working day, and the quotation follows once the material selection, dimensions and quantities are confirmed.
Request a quote
Send the drawing for each part with a material preference if you have one, plus voltage, temperature and mechanical duty. We recommend the construction and confirm manufacturability before production.