Description
Multi-hole capillaries carry several parallel bores through one tube body — the purchasing decision is hole count, hole diameter and pitch (spacing), not a single OD/ID pair.
Dimensions
| Parameter | Example |
|---|---|
| Hole count | 2, 4, 6, 7+ holes, or custom count |
| Example spec — 7-hole | OD 2.4 mm, ID per hole 0.4 mm, length 100 mm |
| Example spec — 7-hole, alternate | OD 2.5 mm, hole ID 0.35 mm |
| Hole diameter | Per drawing, matched to application |
| Pitch / hole position | Per drawing — regular circular arrangement or custom layout |
| OD | Sized to accommodate hole count and pitch, per drawing |
Channel Layout
- Standard: holes arranged symmetrically around the tube’s central axis
- Custom: irregular or application-specific hole positioning available per drawing
- Preform-based multi-capillary construction available for redraw to smaller multi-hole capillary, including square-arranged multi-channel preforms
Application
- Parallel fiber routing — positioning multiple optical fibers through one capillary body
- Parallel fluid/gas channels — independent flow paths through a single tube cross-section
- Mass spectrometry / analytical instrumentation — multi-bore capillary interfaces requiring several parallel channels
Material
Standard fused quartz or borosilicate glass depending on application; quartz preferred where UV transmission or higher temperature resistance is required.
FAQ
What’s the maximum hole count available?
7-hole is a commonly stocked configuration; higher counts (multi-capillary preform-based construction) are available per drawing for specialized redraw applications.
Can hole diameters differ within the same capillary?
Yes, per drawing — different channels can be sized independently if your application requires it.
Is pitch (hole spacing) standardized?
No universal standard — pitch is specified per drawing to match your fiber, flow, or alignment requirement.