HST Splice Calculator
Eurotech | Materials & Engineering
HST Splice Calculator
Calculate the overall size of your splice and estimate the best heat-shrink tubing size. For a single-sided splice, use only the Side A column.
Fill in the green fields only
01
Wire lead outer diameters
Enter the OD (mm) of the wire insulator for each lead in your splice. The square of each OD is calculated automatically.
| Lead | Side A | Side B | ||
|---|---|---|---|---|
| Wire OD | OD² | Wire OD | OD² | |
02
Calculated bundle values
Design splices with cross-sectional areas as balanced as possible on each side of the splice.
| Metric | Side A | Side B |
|---|---|---|
| Sum of OD² | — | — |
| Bundle cross-sectional area (× 0.8) | — | — |
| Total bundle diameter (√ of sum) | — | — |
| Diameter +10% | — | — |
| Diameter −10% | — | — |
03
HST selection
Use the total bundle diameter values to select the HST size from the Eurotech drawing.
IDe · Expanded
Select an expanded ID larger than the largest side by at least +10%.
— mm min
IDr · Recovered
Select a recovered ID smaller than the smallest side by at least 10%.
— mm max
Minimum shrink ratio
Smaller diameter ÷ larger diameter. 1.00–0.50 = 2:1 · 0.49–0.33 = 3:1 · 0.32–0.24 = 4:1 · below 0.24 = > 4:1
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REF
Conductor size reference
| ISO Size | Wire OD | ISO Size | Wire OD | SAE Ga. | GXL | SXL | TXL | GPT |
|---|
