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What Is TIS 107-2566?

For engineers, designers, contractors, and construction material procurement professionals, selecting steel tubes that comply with applicable standards is not merely a matter of product quality. It also affects structural safety, service life, and compliance with project specifications.

One of the most important standards currently in force is TIS TIS 107-2566 Carbon Steel Tubes for General Structural Applications. Issued by the Thai Industrial Standards Institute (TISI), this standard establishes quality requirements and testing criteria for carbon steel tubes intended for general structural applications, helping to ensure consistent product quality, safety, and reliability.

What Types of Steel Tubes Are Covered by TIS 107-2566?
TIS 107-2566 covers carbon steel tubes intended for general structural applications, including:

• Round steel tubes
• Square steel tubes
• Rectangular steel tubes

These steel tubes are commonly used in:

• Office buildings
• Industrial facilities
• Roof structures
• Structural steel frameworks
• Architectural applications
• Infrastructure projects

However, this standard does not apply to steel tubes covered by other specific standards, such as steel water pipes or steel tubes intended for pressure applications.

Why Is TIS 107-2566 Important for Construction Projects?
Using steel tubes that comply with TIS 107-2566 gives all project stakeholders’ greater confidence in product quality, structural integrity, and safety.

Key benefits include:

• Material properties that meet specified requirements
• Accurate dimensions and dimensional tolerances
• Improved product traceability
• Reduced risk of using non-compliant materials
• Enhanced project quality and credibility

For many construction projects particularly government projects, large-scale developments, and projects supervised by engineering consultants the use of materials that comply with applicable standards is an essential requirement for procurement, inspection, and final project acceptance.

How Does TIS 107-2566 Differ from TIS 107-2561?
TIS 107-2566 is the revised standard that supersedes TIS 107-2561 and came into effect on 2 November 2024 (B.E. 2567).

The revision was introduced to modernise the standard and align it more closely with current industry practices, practical applications, and internationally recognised standards.

Did You Know?
A steel tube described simply as a structural tube does not necessarily comply with TIS 107-2566.
Before purchasing or specifying a steel tube, the following should be verified:

• A valid TIS licence has been issued for the product.
• The TIS certification mark is displayed on the product or the accompanying documentation.
• The manufacturer can be clearly identified and the product is fully traceable.

What Should Contractors Check Before Purchasing Steel Tubes?
Before deciding to purchase steel pipes, contractors should consider and verify information regarding at least the following 5 points:

1. The product complies with TIS 107-2566.
2. The manufacturer holds a valid licence issued by the Thai Industrial Standards Institute (TISI).
3. The tube size, wall thickness, and other dimensions meet the project specifications.
4. The manufacturer and the product's origin can be verified.
5. Supporting certification documents are provided upon delivery.

Verifying this information before procurement helps reduce the risk of construction delays, quality issues, and the need to replace non-compliant materials at a later stage.

Is Compliance with a Product Standard Alone Sufficient?
Although compliance with TIS 107-2566 is important, many projects now also consider environmental performance alongside product quality.

This is especially relevant to projects involving:

• Green buildings
• Environmental, Social, and Governance (ESG) considerations
• Green procurement
• Government buildings
• Projects requiring environmentally responsible materials

As a result, additional environmental qualifications—such as the Green Label for construction materials are increasingly considered during material selection.

Conclusion

TIS 107-2566 is an important standard for carbon steel tubes intended for general structural applications. It helps ensure consistent product quality, enhances safety, and strengthens confidence in the overall quality and reliability of construction projects.

For engineers, contractors, and project owners, selecting steel tubes that comply with TIS 107-2566 and are supplied by a reliable manufacturer is a fundamental step toward achieving high-quality construction while reducing long-term project risks.

Frequently Asked Questions (FAQ)

Q : What types of steel tubes are covered by TIS 107-2566?

A : The standard applies to carbon steel tubes for general structural applications, including round, square, and rectangular steel tubes.

Q : When did TIS 107-2566 take effect?

A : It took effect on 2 November 2024 (B.E. 2567), superseding TIS 107-2561.

Q : Are TIS-compliant steel tubes mandatory for government projects?

A : Requirements depend on the Terms of Reference (TOR) and the specifications of each project. In general, government projects and large-scale developments often require construction materials to comply with relevant standards and be supported by verifiable certification documents.

References

• Thai Industrial Standards Institute (TISI) — TIS 107-2566: Carbon Steel Tubes for General Structure
• TISI e-License Industrial Standards System
• Royal Gazette announcement and information relating to TIS 107-2566, available through the TISI database

Notes

• This article is intended to provide information on the industrial standard applicable to carbon steel tubes for general structural applications. It is based on information published by the Thai Industrial Standards Institute (TISI) and other relevant government sources.
• Material-selection requirements may vary according to the Terms of Reference (TOR), project-owner requirements, or designer specifications. The requirements of each project should therefore be reviewed before materials are selected.
• The references in this article were reviewed against official sources as of July 2026 (B.E. 2569) and may be updated in the future.