Alumina thermocouple insulators and multi-bore tubes
Single-, double- and multi-bore insulators that separate thermocouple wires and provide electrical insulation at high temperature and high frequency.
Configurations
- Single bore
- Double bore
- Multi-bore
- Round
- Elliptical
- Capillary
Applications
- Thermocouple wire separation
- High-temperature electrical insulation
- High-frequency electrical insulation
Ordering
- Minimum order, non-standard parts
- 100 pcs
- Usually, per item made to your drawing or sample.
- Samples for approval
- 5–10 pcs
- Usually sent for you to approve before the order runs.
- Production lead time
- 25–30 days
- Usual production cycle for non-standard parts.
- Standard sizes from stock
- ~3–7 days
- Stock covers most standard sizes. Small orders ship in about 3 days, bulk orders in about 7 days.
Typical terms. Quantities and dates for your order are confirmed in its quotation.
Sizes we have produced
- Type
- Single- and multi-bore
- OD
- 1.5–5 mm
- Length
- 15–1200 mm
Other sizes made to drawing; tolerances confirmed per quotation.
Examples, in mm
| OD | Bores | Bore Ø | Length |
|---|---|---|---|
| 1.5 | 2 | — | — |
| 2 | 4 | — | 25 |
| 3 | 4 | — | 20 |
| 3.2 | — | 0.8 | 20 |
| 3.5 | 2 | — | 1200 |
| 4 | — | 0.8 | 20 |
| 4 | 2 | — | 400 |
| 5 | 4 | 1 | 15 |
As marked by the factory on stock labels, packing and photos. The smallest marked twin-bore insulator is about Ø1.5 mm.
Bore patterns we have made
- 1 bore
- 2 bores
- 3 bores
- 4 bores
- 4 bores, 2 + 2
- 5 bores
- 6 bores
- 7 bores
- 1 large + 2 small
End-face sketches, not to scale. Layouts from one to seven bores, including a large bore with two small ones.
Photographed at the factory
Materials and grades
Alumina. The Al₂O₃ grade and bore layout are confirmed per SKU at quotation.
Full datasheets for both grades| Material | Al₂O₃ % | Working temperature °C | Hardness, Mohs |
|---|---|---|---|
| High-alumina | >85 | 1300–1450 | 8 |
| Corundum | 99 / 99.5 / 99.7* | 1600–1800* | 8-9 |
* Stated per SKU. Not every corundum product is 99.7% Al₂O₃ or suitable for 1800 °C; the grade and maximum temperature of each part are confirmed in its quotation.
What to send for a quote
- 01Outside diameter and length
- 02Number of bores, bore diameter and layout
- 03Round, elliptical or capillary section
- 04Wire diameter and thermocouple type
- 05Al₂O₃ grade, or your operating temperature
- 06Quantity
Next family:High-temperature alumina and corundum furnace tubes
Request a quote
Get a quotation for insulators & multi-bore.
Tell us the dimensions, grade and quantity. A contractual datasheet with current, product-specific test data and tolerances comes with each quotation.