Mechanical Systems Standards Summary - October 2025

Looking back at October 2025, the Mechanical Systems and Components for General Use sector experienced a focused but impactful period of standardization activity. Two key standards were published, both centering on the critical area of technical springs—specifically, the detailed measurement and testing procedures for cold formed cylindrical helical extension and torsion springs. For professionals whose work depends on the reliability and consistency of spring components, these standards represent a significant step forward in harmonizing requirements, promoting quality, and facilitating compliance across supply chains. This retrospective overview offers a valuable synthesis of the month’s activity, helping engineers, quality managers, and procurement specialists keep pace with evolving technical benchmarks and implementation challenges.

Monthly Overview: October 2025

October 2025 marked a highly specialized phase in the publication of standards within the Mechanical Systems and Components for General Use sector. Rather than broad-ranging updates, this month’s activity honed in on the nuanced but essential domain of technical springs—a cornerstone in countless mechanical assemblies, from automotive components to industrial machinery and precision devices.

The freshly published parts of the EN ISO 22705 series underscore a clear trend toward greater precision and consistency in the verification of spring performance. These standards, developed collaboratively under the auspices of the International Organization for Standardization (ISO) and the European Committee for Standardization (CEN), solidify measurement, inspection, and documentation practices for cold formed cylindrical helical extension and torsion springs. Notably, both standards excluded dynamic testing, focusing strictly on static parameters that directly affect interchangeability, safety, and mechanical function.

While the total volume of new documents in this subcategory was modest, their depth and technical rigor provided substantial value. Compared to busier months that might span several aspects of mechanical components, October 2025’s focused delivery highlights the sector’s ongoing commitment to fundamental components that underpin reliability in larger systems. For organizations seeking to reduce variability, improve traceability, and interface effectively along complex global supply chains, these standards provide a solid, harmonized foundation.

Standards Published This Month

EN ISO 22705-2:2025 - Measurement & Test Parameters for Extension Springs

Springs - Measurement and test parameters - Part 2: Cold formed cylindrical helical extension springs (ISO 22705-2:2023)

This standard specifies a comprehensive suite of measurement and testing methods tailored to cold formed cylindrical helical extension springs made from round wire. Excluding dynamic testing, EN ISO 22705-2:2025 formalizes the determination of critical static characteristics—such as free length, body length, hook geometry, outside and inside diameter, pitch, total and active coil count, bending radius, and spring load—in a way that is reproducible and industry-accepted.

Key requirements include:

• Mandating the use of precise, ISO-referenced gauges (micrometers, calipers, and optical systems) to capture dimensional characteristics
• Defining test conditions including temperature, measurement location, and operator qualification, ensuring consistency across different manufacturing sites
• Standardizing the calculation and assessment of spring force, initial tension, pitch, hook/opening geometry, and the presence of shear-off burrs
• Providing informative annexes for the calculation of spring rate, initial tension force, and descriptions of hook types

The target audience for this standard spans spring manufacturers, third-party testing laboratories, component integrators, and OEMs with demanding reliability criteria. By excluding dynamic performance testing, EN ISO 22705-2:2025 streamlines static verification, making it particularly valuable for sectors where load-bearing and dimensional repeatability are paramount, such as automotive, industrial machinery, and consumer products.

In the regulatory landscape, this standard aligns with the broader push for traceability and global harmonization of component specifications. Its adoption is poised to reduce disputes across international supply chains by providing a clear methodological baseline for acceptance.

Key highlights:

• Defines standard test and measurement parameters for extension springs
• Focuses on reproducibility and global harmonization of measurement methods
• Supports compliance for a broad range of industries using round wire extension springs

Access the full standard:View EN ISO 22705-2:2025 on iTeh Standards

EN ISO 22705-3:2025 - Measurement & Test Parameters for Torsion Springs

Springs - Measurement and test parameters - Part 3: Cold formed cylindrical helical torsion springs (ISO 22705-3:2024)

Published as the third part of the EN ISO 22705 series, this standard extends harmonized measurement and test practices to cold formed cylindrical helical torsion springs. Like Part 2, it focuses exclusively on static properties, stipulating the detailed requirements for measuring body length, inside and outside diameters, leg and coil geometry, spring pitch, number of coils, bending radius, angle of bend, torque, free angle, and the presence of shear-off burrs.

In addition to specifying essential test equipment and operator credentials, EN ISO 22705-3:2025 introduces annexes covering the calculation of torsional spring rate, classification of leg types, measurement of leg length, and leg offset determination—a boon for manufacturers tackling the complexities of custom torsion spring designs. The inclusion of practical figures and tabulated symbols ensures clarity in communication across multidisciplinary teams.

This standard is indispensable for organizations designing or sourcing torsion springs for applications in mechanisms demanding controlled rotational force—examples include hinge systems, automotive closures, medical devices, and industrial linkages. The unambiguous test methods help prevent ambiguous interpretation during procurement and qualification, supporting contract compliance and reducing time-to-market for new designs.

By embedding these best practices, the standard fortifies the sector’s movement toward interoperable, high-performance mechanical systems amid increasingly global production networks.

Key highlights:

• Details static measurement and test protocols for torsion springs
• Facilitates clear supplier-customer interface by standardizing key parameters
• Supports specialized sectors relying on rotational force components

Access the full standard:View EN ISO 22705-3:2025 on iTeh Standards

Common Themes and Industry Trends

Across both standards published in October 2025, several core themes emerge that illustrate the direction and priorities of the Mechanical Systems and Components for General Use sector:

• Precision and repeatability: The methodology-centric focus of EN ISO 22705-2:2025 and EN ISO 22705-3:2025 reflects the industry’s growing emphasis on reducing variability and increasing interchangeability in critical component performance. Consistent approaches to static test parameters help organizations meet quality assurance benchmarks while supporting traceable supply chains.

• Harmonization with global standards: These parts of the EN ISO 22705 series exemplify collaboration between international (ISO) and regional (CEN) standardization bodies, accelerating global market access and simplifying the regulatory landscape for multinational enterprises.

• Empowerment of supply chain transparency: Detailed requirements for test conditions, operator qualifications, and environmental factors empower both upstream and downstream organizations to communicate expectations clearly, thereby reducing non-conformance risk.

• Focus on static properties: By deliberately excluding dynamic testing, these standards address a market segment where static measurements drive the majority of acceptance or rejection decisions. This approach aligns with sectors where springs must reliably bear loads or provide force/torque but are not typically subjected to high-cyclic fatigue.

• Comprehensive annexes: The inclusion of calculation methods and geometric clarifications in annexes provides practical tools for both designers and inspectors, bridging the gap between theoretical requirements and shop-floor implementation.

Compliance and Implementation Considerations

Professionals responsible for quality management, procurement, and technical compliance should note the following as they integrate the October 2025 spring standards:

• Prioritization and applicability: Assess your organization’s use of cold formed cylindrical helical extension and torsion springs. For applications where static load and dimensional precision are critical, these standards should be adopted as the primary reference.

• Alignment with supplier requirements: Update procurement specifications to require compliance with the relevant EN ISO 22705 standard, ensuring new and existing suppliers are aligned with these harmonized test and measurement protocols.

• Operator training: Ensure that personnel responsible for measuring and testing springs are trained to the documented standards, and that appropriate evidence of qualification is maintained. This supports audit readiness and facilitates downstream supplier evaluations.

• Equipment calibration and verification: Invest in, or verify access to, compliant measurement equipment as prescribed by the standards (i.e., calibrated micrometers, callipers, and force gauges). Periodic verification of measurement devices is a key requirement for ongoing compliance.

• Documented procedures and records: Develop or update internal procedures for spring inspection in accordance with the detailed measurement, testing, and acceptance criteria within these standards. Retain records of calibration, test results, and operator certification for potential third-party review.

• Implementation timelines: Given the harmonization through both ISO and EN publication channels, organizations should aim to implement these standards within six months of their release to maintain alignment with industry best practices. Early adoption may also confer a competitive advantage in contract bidding and cross-border trade.

• Resource links: Access the full EN ISO 22705-2:2025 and EN ISO 22705-3:2025 documents on iTeh Standards for official versions, supporting annexes, and further technical detail.

Conclusion: Key Takeaways from October 2025

In retrospect, while October 2025 brought a concentrated batch of publications, the significance of the EN ISO 22705 series extensions cannot be overstated for the Mechanical Systems and Components for General Use sector. The elevation of measurement and test method rigor for both extension and torsion springs builds stakeholder confidence, enables global harmonization, and supports continuous improvement in quality assurance.

For professionals—from design engineers to quality leads and procurement specialists—the adoption of EN ISO 22705-2:2025 and EN ISO 22705-3:2025 is a strategic imperative. These standards will help reduce supply chain friction, expedite qualification processes, and enhance end-product reliability.

Staying current with evolving standards not only minimizes regulatory risk but also positions organizations ahead of the curve in meeting both client and legal requirements. With the detailed analysis provided above, readers are well-positioned to make informed decisions on compliance, supplier evaluation, and process integration.

Explore all Mechanical Systems and Components for General Use standards published in October 2025 at iTeh Standards.