API TR 21TR2 S-N Fatigue Design and Test Data for Low-Alloy Steel Bolts, Second Edition

About this publication

The API TR 21TR2 S-N Fatigue Design and Test Data for Low-Alloy Steel Bolts, Second Edition is a focused technical reference for bolting engineers, subsea and offshore equipment specialists, integrity professionals, designers, researchers, manufacturers, and reliability teams who need guidance on fatigue design and test data for low-alloy steel bolts. Current API-linked listings identify this publication as the most recent edition of API TR 21TR2, published on July 1, 2025, with product code G21TR202.

What makes API TR 21TR2 valuable is its direct focus on one of the most practical and failure-sensitive issues in bolted equipment design: fatigue performance. API’s publication history for this report family explains that TR 21TR2 provides design methods and representative data for fatigue analysis, and earlier API catalog language for this technical report describes a test program developed to generate bolting material fatigue data for design verification analysis of fatigue-sensitive bolts and to support more accurate design-life estimation.

This is not a broad, general-purpose fastener handbook. Its value comes from being much more targeted. The report is aimed at buyers who need a stronger technical basis for evaluating S-N fatigue behavior in low-alloy steel bolts, especially in demanding service where fatigue life is a real design concern. That makes it especially useful for organizations involved in engineering review, bolting qualification, structural analysis, integrity planning, and high-consequence equipment applications rather than casual reference use.

For serious technical buyers, the Second Edition matters because it gives them the current version of a specialized API report in a narrow but important subject area. In practice, that is exactly the kind of publication engineers and technical libraries want on hand when fatigue-sensitive bolting decisions need to be supported by something more rigorous than internal rules of thumb or scattered legacy data. At 59 pages, it is concise, highly specialized, and built for focused technical review.

Why This Report Matters

The API TR 21TR2 S-N Fatigue Design and Test Data for Low-Alloy Steel Bolts, Second Edition is a strong choice for buyers who need focused fatigue-design information for bolting applications. It is especially well suited for:

• Bolting and fastener engineers

• Offshore and subsea equipment specialists

• Integrity and reliability professionals

• Design verification and analysis teams

• Manufacturers and technical consultants

• Engineering and energy-industry reference libraries

Product Features

• Official API TR 21TR2 technical report

• Second Edition

• Focused on S-N fatigue design and test data for low-alloy steel bolts

• Current API-linked listing identifies it as the most recent edition

• Useful for fatigue analysis, design verification, and bolting-performance review

• Valuable for engineers, researchers, manufacturers, and integrity professionals

• Compact 59-page technical reference

Product Details

• Title: API TR 21TR2 S-N Fatigue Design and Test Data for Low-Alloy Steel Bolts, Second Edition

• Publisher: American Petroleum Institute

• Published: July 1, 2025

• Number of Pages: 59

• Product Code: G21TR202