Overview
EN ISO 4017:2022 - Fasteners - Hexagon head screws - Product grades A and B (ISO 4017:2022) is a CEN-adopted international standard that specifies the characteristics of hexagon head screws made of steel and stainless steel with metric coarse pitch threads from M1.6 to M64. The document covers dimensional requirements, product grades A and B, marking and labelling, designation and relevant test/acceptance references. EN ISO 4017:2022 is identical to ISO 4017:2022 and supersedes the 2014 edition.
Key topics and technical requirements
- Scope and materials: Applies to steel and stainless-steel hexagon head screws fully threaded to the head, product grades A and B, thread sizes M1.6–M64.
- Dimensions and tolerances: Detailed dimension tables and figures (Clause 4 and Annex A) define head, thread and length parameters. The standard restructured tables to reduce selection errors and restored rules for shortest/longest standard lengths.
- Product grades: Defines dimensional and tolerance differences for product grades A and B; Annex A contains dimensions for grade B for certain sizes.
- Mechanical/property options: When other specifications are required, property classes and stainless-steel grades may be taken from ISO 898‑1 (carbon/alloy steels) or ISO 3506‑1 (stainless steels).
- Marking and labelling: Clause 6 specifies product marking and package labelling requirements to support traceability and quality control.
- Normative references: Incorporates related fastener standards (e.g., ISO 225, ISO 888, ISO 965‑1, ISO 4753, ISO 4759‑1) that define symbols, nominal lengths, thread tolerances, ends and tolerance classes.
- Notable updates in 2022 edition: tables restructured, M7 added, tolerance change for d ≤ M5 (s − IT16 → s − IT15), restoration of greatest standard lengths, additions of certain property classes and stainless grades, and explicit marking/labelling requirements.
Applications and who uses it
EN ISO 4017:2022 is used wherever standardised hexagon head screws are specified or produced:
- Design and mechanical engineers specifying fasteners for assemblies
- Fastener manufacturers and cold/forming suppliers for production and inspection
- Procurement and sourcing teams for standardized purchasing
- Quality, inspection and testing laboratories performing acceptance checks
- Maintenance and repair organizations requiring interchangeable fasteners
Practical applications include general machinery, automotive repair, construction equipment, industrial assembly and any application requiring metric hexagon head screws with defined dimensions and traceable properties.
Related standards (select)
- ISO 898‑1 - Mechanical properties of carbon/alloy steel fasteners
- ISO 3506‑1 - Mechanical properties of stainless-steel fasteners
- ISO 888 - Nominal lengths and thread lengths
- ISO 4753 - Ends of parts with external ISO metric thread
- ISO 4759‑1 - Tolerances for fasteners - Product grades A, B and C
Keywords: EN ISO 4017:2022, hexagon head screws, fasteners, metric coarse pitch threads, product grades A and B, screw dimensions, fastener standards.
