Description
This is the base round-bore capillary — the one you specify when your requirement is OD, ID, wall and concentricity, without a fiber-diameter constraint, a flow-analytical bore, multiple holes, or a non-round bore. Those needs each have their own page; this page is the general-purpose round precision bore.
Dimensions & Tolerance
| Parameter | Range |
|---|---|
| OD | 0.1 – 10 mm |
| ID | 0.05 – 9 mm |
| Wall thickness | From 0.05 mm |
| Length | Up to 1000 mm standard; longer per drawing |
| OD tolerance | ±0.01 mm standard; ±0.005 mm on request |
| OD tolerance — alternate reference, sub-6 mm OD | ±0.05 mm standard; ±0.02 mm precision custom; ±0.01 mm high-precision |
| Concentricity | Per drawing |
Production Method
- Precision drawn from preform, or machined from round tube stock
- CNC wire-drawing tower process for high dimensional accuracy and positioning precision
End Options
- Open both ends, no funnel — straight capillary
- Open with funnel/taper at one end — see Fiber Optic Capillaries for bell-mouth/tapered-entry geometry specifically
- Closed one end — for sample mounting or sealed applications
Material
High-purity fused quartz, SiO₂ >99.99%; UV-grade transmits 185–2500 nm; refractive index n=1.458 at 589 nm; working temperature to 1100°C.
FAQ
What’s the tightest OD tolerance available?
±0.005 mm on request for standard round capillary; some suppliers cite ±0.01 mm as their high-precision standard. Confirm against your OD/wall combination.
Is this the right page for a capillary carrying an optical fiber?
No — see Fiber Optic Capillaries, which covers the 125 µm fiber-diameter bore and bell-mouth entry geometry specifically.
Can length be cut to a specific dimension rather than standard stock?
Yes — length is cut per drawing, from short lab-scale pieces up to 1000 mm standard, longer on request.