The dimensional tolerance range of seamless precision tube mainly depends on their outer diameter size and the required accuracy level. Here are some common dimensional tolerance ranges:

Ordinary seamless precision tubes

For ordinary seamless precision tubes, the outer diameter tolerance is usually ±0.05mm. This is the basic tolerance requirement in the manufacture of precision steel tubes and is suitable for general industrial applications.

High-precision seamless precision tubes

For occasions requiring higher precision requirements, such as aerospace, medical equipment and other fields, the outer diameter tolerance of high-precision seamless precision tubes can reach ±0.025mm or even smaller. This kind of steel tube has higher dimensional stability and processing accuracy.

Special precision seamless precision tubes

In special applications, such as precision instruments, electronic equipment and other fields, the outer diameter tolerance of special precision and special seamless precision tubes can be controlled within ±0.01mm or even ±0.005mm. These steel tubes have extremely high dimensional accuracy and surface finish, and are suitable for application scenarios with extremely high requirements for size and shape.

Comparison of outer diameter size range and tolerance

In addition, the tolerance of seamless precision tubes may also vary depending on the specific outer diameter size range. For example:

For steel pipes with an outer diameter between 4mm and 30mm, the tolerance range may be between ±0.10mm and ±0.05mm (depending on the accuracy level).

For steel pipes with an outer diameter between 31mm and 160mm, the tolerance range may gradually increase, but usually does not exceed ±0.30mm (also depending on the accuracy level).

Notes

The tolerance range of the outer diameter may also increase as the outer diameter increases. For example, when the outer diameter is between 6 and 10mm, the tolerance may be ±0.20mm; when the outer diameter is between 30 and 50mm, the tolerance may increase to ±0.40mm (but this range is not absolute and needs to be determined according to standards or contract requirements).

The control of the inner diameter tolerance is equally important, which affects the flow efficiency and stability of the fluid inside the steel pipe. Generally speaking, the inner diameter tolerance is also controlled within a similar range to the outer diameter tolerance.

Summary

In summary, the dimensional tolerance range of seamless precision tubes is a relatively complex concept, which depends on many factors, including outer diameter size, precision grade and specific application scenarios. Therefore, when selecting and using seamless precision tubes, relevant standards or contract requirements should be carefully consulted to ensure that their dimensional tolerances meet actual needs.