Overview
EN ISO 4014:2022 (Fasteners - Hexagon head bolts - Product grades A and B) is the CEN-adopted European version of ISO 4014:2022. It specifies the characteristics of partially threaded hexagon head bolts in steel and stainless steel with metric coarse pitch threads M1,6 to M64, for product grades A and B. The standard defines dimensions, dimensional options, marking and labelling, and references related mechanical and quality requirements.
Key topics and requirements
- Scope and sizes: Covers hexagon head bolts M1,6 to M64, product grades A and B (partially threaded).
- Dimensions and tolerances: Detailed dimensional tables and figures (head, shank, thread lengths). Rules for shortest and greatest standard lengths are included. Annex A provides dimensions for product grade B for smaller sizes.
- Materials and property classes: Applies to steel and stainless steel bolts. Where other specifications are required, property classes and stainless steel grades can be selected from ISO 898-1 (carbon/alloy steel) or ISO 3506-1 (corrosion-resistant stainless steel). Notable updates in the 2022 edition include added property classes (e.g., 4.8 and 12.9) and new stainless grades (D4, D6) and property class 80; deletion of class 9.8 and non‑ferrous metal bolt specs.
- Thread and end forms: Metric coarse pitch threads per ISO general thread tolerances; end finishes (chamfered or as‑rolled for small sizes) and incomplete thread limits are specified.
- Marking, labelling and designation: Requirements for marking on product and package labelling to enable traceability and correct designation in procurement.
- Quality and inspection: Normative references include inspection and acceptance standards (e.g., ISO 3269, ISO 6157 series) and surface/coating standards (ISO 4042, ISO 10683, ISO 10684).
Practical applications and users
EN ISO 4014:2022 is intended for anyone specifying, producing, testing or procuring hexagon head bolts:
- Design and mechanical engineers selecting fasteners for machinery, automotive, structural and industrial applications.
- Fastener manufacturers and quality control teams ensuring production dimensions, tolerances and marking comply with international practice.
- Purchasing and procurement professionals who need standardized product designations and labelling for supply-chain traceability.
- Testing laboratories and inspectors conducting acceptance inspections and conformity assessment.
- OEMs and maintenance teams replacing or specifying compatible bolts to ensure interchangeability and performance.
Keywords: EN ISO 4014:2022, ISO 4014, hexagon head bolts, product grades A and B, metric coarse pitch threads, fasteners, bolt dimensions, property classes, stainless steel grades.
Related standards
Use EN ISO 4014:2022 for consistent specification, manufacturing and procurement of hexagon head bolts across industries.