The International Organization for Standardization (ISO) has released an updated version of ISO 898-1, which is earlier than the usual five-year review cycle. This standard serves as the fundamental mechanical performance guideline for carbon steel and alloy steel bolts. Dr. John Newnham, a fastener industry consultant, has analyzed the reasons behind this early revision and its potential impact on the global fastener market.
ISO 898-1 outlines the strength classes, permissible materials, and required testing procedures for bolts, screws, and studs. It not only defines the properties of ISO-standard fasteners but also acts as a reference for creating patent drawings for non-standard components. The 2013 edition of the standard was published in January, significantly ahead of the typical review schedule.
The previous 2009 version of the standard faced considerable debate, with several national standards bodies raising concerns. As a result, 11 members of the ISO Technical Subcommittee drafted two revisions to address both technical and editorial issues. However, the scope of these changes was so extensive that the revised document could not be issued separately. Therefore, ISO re-published ISO 898-1, incorporating all the updates into a single release. While the preface refers to it as a minor revision, there are several technical adjustments that could affect existing products.
In addition to editorial improvements aimed at ensuring clarity and consistency, the new standard continues to emphasize the use of the latest reference documents. This ensures that any referenced standard is immediately applicable upon release.
Although the material types and strength levels remain unchanged, the Brinell hardness ranges for grades 8.8 and above have been adjusted. Mechanical and physical properties in Table 3 have also seen modifications. These changes mean that parts produced under the old standard may no longer meet the requirements of the new version, potentially leading to inventory issues.
Other technical updates involve the definitions and evaluation of carburizing and decarburization. A new surface condition called "ferrite decarburization" has been introduced, particularly relevant for high-strength grades like 8.8 and above. Additionally, some process-related revisions have been made. To ensure compliance, these surface conditions must be assessed through microhardness testing and metallurgical analysis, which may require laboratories to undergo audits.
While ISO classifies the 2013 update as a minor revision, the underlying technical changes are significant. Both manufacturers and distributors should stay informed about these updates. The new EN ISO 898-1 standard is now available through the National Standards Institute.
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