Titanium Capillary Tubes

Titanium capillary tubes are very small-diameter tubular products produced by multiple passes of precision drawing from fine titanium wire feedstock or small-diameter seamless tube blanks. The drawing process achieves tight outer diameter, inner diameter and wall thickness tolerances that are critical for analytical instrumentation, sensing systems and specialized process equipment where small flow passages, pressure control or precise fluid handling is required.

Supply is coordinated per inquiry against outer diameter, inner diameter (or wall thickness), required tolerance class, grade and length. Due to the specialized nature of capillary tube production, wall thickness and length are confirmed against each specific order.

Titanium Capillary Tube Specifications

Parameter	Standard / Industry Reference Range	Custom Supply Range
Outer Diameter (OD)	3 – 10 mm	Custom OD per drawing within feasible precision-drawing range
Inner Diameter (ID) or Wall Thickness	Confirmed against each specific order	To Be Confirmed Against Product Requirements
Length	Confirmed against each specific order	Custom lengths per application
Tolerance Class	Confirmed against each specific order	Tight tolerance classes available; confirmed per inquiry

Grades & Materials

Regular Stock

Grade 1 (CP Ti) and Grade 2 (CP Ti) capillary tubes in common diameters may be available from stock. Availability depends on the specific OD and tolerance class.

Custom Coordination

Grade 5 (Ti-6Al-4V) and other titanium or titanium alloy grades. Capillary tube production feasibility for alloy grades depends on the drawing properties of the specific material and the required diameter and tolerance.

Standards & Technical References

Titanium capillary tubes with outer diameters in the 3 – 10 mm range are precision-drawn tubular products used primarily in analytical, instrumentation and specialty process applications. These products are not directly covered by the standard seamless or welded round tube specifications (ASTM B338 / B337), which apply to larger-diameter round tubes intended for heat exchanger and process piping service.

For capillary tubes, applicable requirements are typically agreed against the specific product requirement drawing, including tolerance class, wall thickness uniformity, surface finish and inspection criteria. Applicable test standards (for example tensile testing, chemical composition, dimensional inspection) are selected based on the order specification.

Typical Application Areas

Analytical Instruments

Small-bore titanium tubing for chromatography systems, mass spectrometry sample introduction lines and spectroscopy equipment where corrosion resistance and inertness are required.

Instrumentation & Sensing

Fine-diameter tubing for pressure sensing, fluid distribution and sample transfer in industrial instrumentation and process control systems.

Specialty Process Equipment

Custom capillary configurations for specialized process loops, electrochemical cells, lab reactors and research equipment.

Medical & Laboratory

Titanium capillary tubing for biocompatible lab equipment, fluid handling systems and research apparatus where titanium corrosion resistance is critical.

Quality & Documentation

Dimensional inspection reports covering OD, ID, wall thickness, straightness and surface finish.
Outer diameter tolerance verification and wall thickness uniformity checks (performed on representative samples or full length per requirement).
Material test certificates for the feedstock wire or blank tube.
Tensile testing or chemical composition reporting where specified by the order.

Frequently Asked Questions

Are titanium capillary tubes covered by ASTM B338?

No. ASTM B338 and B337 are standard specifications for seamless and welded round titanium tubes intended for heat exchanger and process piping service. These standards are designed for larger-diameter round tubes and do not directly cover precision-drawn capillary products in the 3 – 10 mm OD range. Capillary tube requirements are typically agreed against the specific product drawing and order specification.

What determines whether a capillary tube can be supplied?

Supply feasibility for a specific capillary tube depends on four factors: the required outer diameter, the required wall thickness (or inner diameter), the grade, and the tolerance class. Very tight tolerances, very small wall thicknesses and certain alloy grades can each limit the drawing feasibility. Every order is reviewed against these parameters before quotation.

Which capillary tube grades are available?

Grade 1 (commercially pure titanium) and Grade 2 are the most common capillary tube grades and are produced with standard drawing processes. Grade 5 (Ti-6Al-4V) and other alloy grades require additional technical review to confirm drawing feasibility and availability.

What tolerance class can be held?

Tolerance capabilities depend on the OD, wall thickness and grade. Tighter tolerances generally require more drawing passes and more refined tooling, which affects lead time and price. Required tolerance class should be specified in the inquiry so feasibility and cost can be confirmed.

Request a Quotation for Titanium Capillary Tubes

To receive an accurate quotation, please provide as many of the following details as possible: outer diameter, inner diameter (or wall thickness), tolerance class, grade, required length, quantity and intended application. If you have a drawing or specification sheet showing the capillary tube dimensions and tolerances, please share it with our sales team.

Helpful details: OD, ID or Wall Thickness, Tolerance Class, Grade, Length, Quantity, Application, Drawing / Specification

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