Mylar Sleeves for Fastener and Bolt Thread Protection
Mylar (PET film) sleeves for protecting threaded fasteners, bolts and studs during shipping, storage and assembly. The sleeves prevent thread damage, corrosion and contamination while providing electrical insulation. Easy to install -- slides over the thread and stays in place during handling.
Mylar (PET film) sleeves for protecting threaded fasteners, bolts and studs during shipping, storage and assembly. The sleeves prevent thread damage, corrosion and contamination while providing electrical insulation. Easy to install -- slides over the thread and stays in place during handling.
Technical specifications
| Material | Mylar (PET film) |
| Operating temperature | -55 C to +105 C continuous |
| Wall thickness | 0.05 mm to 0.25 mm (customizable) |
| Dielectric strength | >= 15 kV/mm |
| Chemical resistance | Good resistance to oils, greases and mild chemicals |
| Tensile strength | >= 50 MPa |
| Shrink ratio | Non-shrink -- slip-on installation |
| Standards | ASTM D880 (PET film), IEC 60250, RoHS, REACH |
💾 Datasheets & Test Reports
Download the technical data sheet for this product (PDF).
Applications by industry
- Threaded bolt and stud protection during transport
- Electrical insulation for exposed threads in panels
- Corrosion prevention on fasteners in outdoor equipment
- Clean-thread protection in aerospace and precision assembly
- Anti-abrasion sleeves for moving fasteners
- Insulation sleeves in electrical junction boxes
Why mylar for this application
Mylar (PET) provides good dielectric strength and tear resistance at low-to-moderate temperatures, commonly used for cable and wire bundling insulation.
Maximum continuous use 105 °C; not for high heat or chemical exposure.
Standards: ASTM D880 (PET film), IEC 60250 (dielectric).
Feature and remaining-wall review
Heat-formed to ID/OD; laser or die-cut for slots and holes. Review feature depth, edge distance and remaining wall against critical geometries. Capability is confirmed on your drawing, not from a blanket tolerance.
Inspection and traceability
We state the control plan with you. Batch traceability links raw material lot to finished part.
- First-article inspection (FAI) per your plan
- In-process dimensional checks at every station
- Batch certificate of conformance (COA) supplied on request
- Lot traceability to incoming material certificate
- Dielectric strength and insulation resistance testing available on request
Related components
Mylar Tube (PET Film Insulation Tube)
Related component from the WELLELE catalog.
Polyimide Tubing
Related component from the WELLELE catalog.
PTFE/FEP/PFA Teflon Heat Shrink Tubing
Related component from the WELLELE catalog.
Common questions
What is the maximum temperature for Mylar (PET) tubing?
Continuous use to 105 °C. Not recommended above that for extended periods.
Is Mylar suitable for wire harnessing?
Yes — good dielectric strength and tear resistance for low-to-moderate temperature wire bundling.
Can Mylar tubing be heat-shrink?
Mylar can be heat-formed but does not shrink like polyolefin. Use for sleeving where dimensional stability matters.
What tolerances can you hold?
ID/OD ±0.1 mm typical for heat-formed Mylar. Tighter with custom die-forming.
Do you ship RoHS and REACH compliant?
Yes. All standard grades comply with RoHS 2011/65/EU and REACH 1907/2006.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Mylar Sleeves for Fastener and Bolt Thread Protection
Attach the drawing with annual volume. We check the material against your duty and tolerance, verify ID / OD / wall / features, and respond with manufacturability notes and pricing.