12 × 7 mm single-bore alumina insulator
OD 12 mm · bore Ø7 mm · wall 2.5 mm
- Standard size
A thin alumina tube with one bore. It sleeves a single wire or lead and insulates it at high temperature.
Specifications
Nominal dimensions from our factory's standard-size list, September 2026.
| Outside diameter (OD) | 12 mm |
|---|---|
| Bores | 1 bore |
| Bore diameter | Ø7 mm |
| Wall thickness | 2.5 mmcomputed: (OD − ID) ÷ 2 |
| 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 12 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
No order tolerance is on record for this size yet. We state the tolerance in the quotation.
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 12 × 7 mm single-bore insulator.
Tell us the dimensions, grade and quantity. A contractual datasheet with current, product-specific test data and tolerances comes with each quotation.