Select by both diameters
The expanded bore must pass over the largest part of the assembly. The recovered bore must fit the finished component; shrink ratio alone is not a size specification.
INSULATION
Heat Shrink Tubing
Heat-activated polymer tubing fits around wires, splices and connections to support electrical insulation, identification and mechanical protection.
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PRODUCT OVERVIEW
A precise fit around every connection.
Choose the wall system
Single-wall tubing supports insulation and identification. Adhesive-lined constructions add a bonding layer; sealing performance depends on material and installation.
Plan the installation
Specify cut length and allowance for longitudinal change. Follow the approved heating guidance and avoid overheating the underlying assembly.
Does one temperature rating cover all tubing?
No. Material and wall construction affect temperature and electrical performance. Request the product-specific data sheet for the selected tubing.
How do I request a custom specification?
Send the drawing or sample, required material, dimensions, quantity and installation conditions. We confirm the quotation, sample and applicable documentation before production.
APPLICATIONS
Where it fits
Wire harnesses, splice insulation, cable identification and selected busbar applications.
SELECTION
Specify the complete product
Select an expanded bore that passes over the assembly and a recovered bore that fits the finished part. Specify material, colour, cut length, shrink ratio and any adhesive lining.
DIMENSIONAL SELECTION
Product specifications
| Nominal size (in) | Expanded ID min. (mm) | Recovered ID max. (mm) | Recovered wall nominal (mm) | Enquiry |
|---|---|---|---|---|
| 3/64 | 1.17 | 0.58 | 0.41 | Select size |
| 1/16 | 1.60 | 0.79 | 0.43 | Select size |
| 3/32 | 2.36 | 1.17 | 0.51 | Select size |
| 1/8 | 3.18 | 1.57 | 0.51 | Select size |
| 3/16 | 4.75 | 2.36 | 0.51 | Select size |
| 1/4 | 6.35 | 3.18 | 0.64 | Select size |
| 3/8 | 9.53 | 4.75 | 0.64 | Select size |
| 1/2 | 12.70 | 6.35 | 0.64 | Select size |
| 3/4 | 19.05 | 9.53 | 0.76 | Select size |
| 1 | 25.40 | 12.70 | 0.89 | Select size |
| 1-1/2 | 38.10 | 19.05 | 1.02 | Select size |
| 2 | 50.80 | 25.40 | 1.14 | Select size |
| 3 | 76.20 | 38.10 | 1.27 | Select size |
| 4 | 101.60 | 50.80 | 1.40 | Select size |
2:1 dimensional reference from 3M FP-301, November 2018. No 3M material approval or certification is transferred. Values are selection references, not a declaration of interchangeability. Confirm the quoted product and approved drawing before ordering.
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SELECTION DRAWING
Heat Shrink — engineering details
D: expanded inside diameter; d: recovered inside diameter; t: recovered wall; L: cut length. Selection schematic; not a production drawing.
