As of June 2026, the international standard system for fasteners is currently in an active period of centralized revision of the ISO series and collaborative revision of American/European standards. The following is a summary of the most recent revisions and releases (2025-2026) according to the standard system, for your compliance and selection reference:

1、 Latest revision of ISO/EN ISO fastener standards (centralized release in 2026)

ISO/TC 2 (Fasteners Technical Committee) and CEN/TC 185 continue the collaborative release model of the Vienna Agreement, with multiple basic standard updates starting from March 2026

1. Hexagonal socket set screw series (2026 new version)

ISO 4026:2026 hexagon socket head set screw (4th edition), replacing the 2003 edition; Add steel M30 specification, stainless steel surface condition “Clean and bright/Passivated”, add marking and labeling section, delete non-ferrous metals and approximate quality table

-ISO 4027:2026 Hexagonal Cone End Tightening Screw, Updated Simultaneously
ISO 4028:2026 Hexagonal Column (Dog Head) End Tightening Screw, Added M30, Revised Small Dimensional Tolerance, Added Machining Residue Appendix

ISO 4029:2026 hexagonal concave (cup) end set screw synchronized update

2. Hexagonal socket head screw and load reducing head screw

ISO 10642:2026/EN ISO 10642:2026 Hexagonal countersunk load reducing screws: updated bearing capacity labeling (zero prefix labeling 80% load), minimum tensile load value rounding, mandatory labeling and packaging label traceability requirements

-ISO 7380-3:2026 Hexalobular pan head load reducing screws have been released, covering steel/stainless steel metric fine and coarse thread series

The above-mentioned ISO 2026 version is usually adopted synchronously by the EU as EN ISO XXX: 2026, and BS EN/DIN EN in countries such as the UK and Germany will replace the old version accordingly.

3. Previous important foundational updates (still influential around 2023)

ISO 898-1:2023 Mechanical properties of carbon steel bolts/screws: Fine tuned strength grade testing method and decarburization layer determination, listed as a key focus for 2024-2026 version change by most export enterprises

-ISO 3506-1/2/3:2023 Stainless Steel Fasteners: New Guidelines for Hydrogen Embrittlement Protection and intergranular Corrosion Evaluation

2、 Recent Developments in the American Standard System (ASME/ASTM/SAE)

ASME B18 Product Dimensional Standards

-ASME B18.3 (Internal Hexagon Cylinder Head Screws and Set Screws): 2025-2026 is in the revision and promotion period, with plans to reintroduce spline drive, revise short screw thread requirements, update the set screw size table, and reduce the risk of hydrogen embrittlement in electroplating for low-strength steel clauses; The new version B18.3 is expected to be released in the second half of 2026-2027
-ASME B18.16.4 (serrated hexagonal flange nut): Hardness testing and chemical composition revision of hydrogen embrittlement prevention clause
ASME B18.15 (eyebolt) and B18.31.2 (bolt type) have both been updated with edited and referenced standards

ASTM Performance/Material/Coating Standards

ASTM F3125/F3125M -25 Structural Hexagon Bolts: Addition of Grade 144, Torque Control Components, and Metric 830/1040 MPa Correspondence

ASTM A193/A193M-25, A962/A962M-25 High Temperature and High Pressure Bolts: Remove redundant restrictions and add requirements for decarburization/carburization testing

-ASTM F606/F606M revised to clarify the bearing capacity of small screw wedges and hydrogen embrittlement wedge angles; Discussion on Proposal for Coupling Nut Verification Load Test
IFI (Industrial Fasteners Association) continues to release consensus supplementary specifications such as IFI-100/144/145, and maintains linkage with ASTM/SAE.

3、 The combined impact of European standards/DIN/REACH and green compliance

DIN EN ISO and ISO collaboration: German standards have been widely adopted as equivalent to DIN EN ISO; DIN specific old standards (such as DIN 933/934/931) are still partially retained, but European procurement contracts are mostly shifting towards EN ISO/DIN EN ISO

-REACH SVHC List: Continuously expanding from 2025 to 2026, with stricter restrictions on hexavalent chromium and specific amine passivators, affecting the selection of galvanizing/passivation processes
The CBAM (Carbon Boundary Adjustment Mechanism) requires implicit carbon declaration for steel fasteners, forcing export companies to establish ISO 14067 carbon footprint accounting and EPD, which has been listed as a “factual access extension” by the International Standards Forum.

4、 Influence and Suggestions on the Practice of Chinese Enterprises

1. Drawing and BOM standard number refresh: If the customer specifies the ISO 4026/4028 series, it should be switched to the 2026 version starting from 2026, paying attention to the differences in M30 expansion and marking chapter
2. Add the marking rule of “0+performance level” to the hexagon socket load reducing countersunk screw (ISO 10642:2026), and the quotation and mold/inspection card need to be updated synchronously
3. Export to North America: track the effective node of ASME B18.3 new version; F3125-25 has come into effect. Attention should be paid to the compatibility requirements of Grade 144 and galvanizing for structural bolt projects
4. System documents: The list of referenced standards in the quality manual should be reviewed annually to avoid listing outdated versions such as ISO 4026:2003.
5. Carbon&Environmental Protection: Even if the standard text is not mandatory, European host manufacturers often refer to REACH+ISO 14067/CBAM in their “Technical Supply Conditions”, which is a dual constraint of “standards+customer specifications”.

⚡ Quick overview in one sentence

The most significant changes to the international fastener standards in 2026 are the comprehensive update of the ISO hexagon socket set screw series (4026~4029:2026), the update of the reduced load hexagon countersunk/plum blossom pan head screws, and the ongoing major changes to the American standard structural bolts F3125-25 and ASME B18.3; At the same time, green compliance (REACH/CBM) is becoming the de facto “quasi standard” threshold.