8 × 1.6 mm four-bore alumina insulator
OD 8 mm · 4 bores of Ø1.6 mm
- Standard size
A round alumina rod with four bores, for two thermocouple pairs in one sheath or a sensor that needs four leads. It keeps each wire apart and insulated inside the protection tube.
Specifications
Nominal dimensions from our factory's standard-size list, September 2026.
| Outside diameter (OD) | 8 mm |
|---|---|
| Bores | 4 bores |
| Bore diameter | Ø1.6 mm |
| Length | Cut to your order, within 10–4000 mm |
| Availability | Standard size. Stock covers most standard sizes; the quotation confirms availability |
| Material and grade | Alumina. The Al₂O₃ grade and bore layout are confirmed per SKU at quotation. |
Our protection tubes it fits
Protection tubes from our standard list whose ID is at least 1 mm larger than this insulator's 8 mm OD.
How we worked it out: insulator OD + 1 mm ≤ tube ID, on nominal sizes, which leaves room for the tolerances of both parts. Check the fit against your own drawing.
Tolerances on our 2026 orders
What buyers wrote on the orders we supplied in 2026 for 3–8.5 mm OD. They are what was ordered and delivered, not a promise for every order: the tolerance for your order is the one in its quotation.
| Dimension | Tolerance on orders (mm) |
|---|---|
| OD | ±0.2 to ±0.5 |
| Each bore | ±0.15 to ±0.3 |
| Length | ±1 |
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.
Request a quote
Get a quotation for the 8 × 1.6 mm four-bore insulator.
Tell us the dimensions, grade and quantity. A contractual datasheet with current, product-specific test data and tolerances comes with each quotation.