Description
Thick-wall capillaries increase wall thickness relative to bore diameter — chosen for mechanical robustness or handling strength at a given bore size, where a standard-wall capillary would be too fragile or too flexible for the application.
Dimensions & Tolerance
| Parameter | Specification |
|---|---|
| OD / ID | Per drawing — wall-to-bore ratio is the defining spec, not a fixed OD range |
| Tolerance | ±0.05 mm or higher (standard heavy-wall) |
| Tolerance — tapered-hole variant | ±0.03 mm or higher |
| End | Cut to length; ground end available |
| Surface | Smooth |
Wall-to-Bore Ratio
Unlike standard-wall capillary where wall thickness follows loosely from OD, thick-wall capillary is specified by the ratio itself — state the required bore ID and the mechanical strength/OD target, and wall thickness is set to meet both, per drawing.
Production Method
By drawn process — precision drawn from preform to the target OD/ID/wall combination.
Application
- Mechanical robustness where a capillary needs to survive handling, insertion, or mechanical loading that a thin-wall capillary wouldn’t withstand
- Precision bore maintained despite the increased wall thickness
Material
High-purity silica glass; transparent, standard fused quartz grade.
FAQ
How is thick-wall capillary different from just choosing a larger OD at standard wall ratio?
The wall-to-bore ratio itself is the spec — thick-wall capillary holds a smaller bore inside a comparatively larger, stronger OD than a standard draw would produce, for cases where mechanical strength matters more than minimizing OD.
What tolerance can be held on a thick-wall capillary?
±0.05 mm standard, ±0.03 mm or better achievable depending on OD/wall combination — confirm against your drawing.