Typical Tolerances for Titanium Tubing Dimensions
Titanium tubing is widely used in demanding applications where precision and consistency are crucial. The dimensional tolerances-how much the actual size can vary from the specified size-are set by international standards and can vary by manufacturing process, grade, and intended use (e.g., aerospace, medical, industrial).
Below are the typical tolerances for titanium tubing dimensions based on common industry standards.
1. Key Dimensions for Titanium Tubing
Outer Diameter (OD)
Wall Thickness
Length
Roundness/Straightness
2. Common Standards
ASTM B338: Seamless and welded titanium tubes for condensers and heat exchangers.
ASTM B861: Seamless and welded titanium and titanium alloy tubes for general use.
ASTM B337: Large diameter seamless and welded titanium tubes.
3. Typical Tolerances (Reference: ASTM Standards)
| Dimension | Tube OD (mm) | Tolerance (mm) | Tolerance (in) |
|---|---|---|---|
| OD | ≤ 25.4 (1") | ±0.13 | ±0.005 |
| 25.4–50.8 (1–2") | ±0.25 | ±0.010 | |
| > 50.8 (2"+) | ±0.38 | ±0.015 | |
| Wall | ≤ 1.0 mm | ±10% | ±10% |
| (Thickness) | > 1.0 mm | ±7.5% | ±7.5% |
| Length | < 3 meters | +3.2 / -0 | +0.125 / -0 |
| ≥ 3 meters | +6.4 / -0 | +0.25 / -0 |
Note:
Tighter tolerances can be specified for aerospace or medical applications, often requiring special order and higher cost.
Welded tubes may have slightly larger tolerances than seamless tubes.
Always check with your supplier for their specific tolerance guarantees, as practices may vary.
4. Roundness and Straightness
Roundness:
The difference between maximum and minimum OD should not exceed the OD tolerance.
Straightness:
Typically, not more than 1.5 mm per meter (0.06 inch per 3.3 feet) of tube length, but can be tighter for critical applications.
5. Aerospace & Medical Applications
Aerospace often requires tighter tolerances (e.g., ±0.05 mm or ±0.002 inch OD).
Medical tubing (e.g., for implants) may specify both tighter OD and wall thickness tolerances and strict surface finish requirements.
6. Summary Table
| Specified OD | OD Tolerance | Wall Tolerance | Typical Use |
|---|---|---|---|
| ≤ 25.4 mm (1") | ±0.13 mm (0.005") | ±10% | General, industrial |
| > 25.4–50.8 mm | ±0.25 mm (0.010") | ±7.5% | Structural, performance |
| > 50.8 mm (2") | ±0.38 mm (0.015") | ±7.5% | Heat exchangers, large tubes |
| Custom/Aero/Med | ±0.05 mm (0.002") | ±5% or better | Critical, high-precision |
Conclusion
Titanium tubing tolerances typically range from ±0.13 mm (±0.005") for small diameters to ±0.38 mm (±0.015") for large diameters, with wall thickness tolerances of 7.5–10%.
Tighter tolerances are possible for high-precision applications but may increase cost and lead time.
Need help specifying or sourcing titanium tube for your project's specific tolerance requirements? Let me know your application and I'll provide expert guidance!
