Overview
EN ISO 4762:2004 (ISO 4762:2004, corrected version 2024-08) specifies the characteristics of hexagon socket head cap screws with coarse‑pitch metric threads from M1.6 up to and including M64, for product grade A. The standard, adopted by CEN as a European Standard, covers dimensional requirements, key mechanical and material references, marking/ designation examples and informative mass data.
Key topics
- Scope and sizes: Coarse pitch threads M1.6 → M64; product grade A is specified.
- Dimensions and gauging: Detailed head, socket and shank dimensions are given (see Figure 1 and Table 1 in the standard). Socket gauging rules (ISO 23429) and maximum underhead fillet rules are included.
- Threads and tolerances: Thread profile and tolerances follow ISO general‑purpose metric thread standards (ISO 261, ISO 965 series); thread quality/tolerance classes are referenced for different property classes.
- Materials and mechanical properties: References for carbon/alloy steels, stainless steels and non‑ferrous materials are provided (e.g., ISO 898‑1, ISO 3506‑1, ISO 8839). Property classes (e.g., 8.8, 10.9, 12.9 and stainless grades) are covered by cross‑references.
- Surface finish and coatings: “As processed” and plain finishes are allowed; electroplate and non‑electrolytic coatings are covered by ISO 4042 and ISO 10683 respectively.
- Inspection and acceptance: Acceptance inspection procedures and limits for surface discontinuities are referenced (ISO 3269, ISO 6157‑1 / ‑3).
- Masses: Annex A provides approximate masses for commercial lengths (informative).
- Designation example: Hexagon socket head cap screw ISO 4762‑M5x20‑12.9.
Practical applications and users
This standard is essential for:
- Design engineers and product designers selecting screw types and sizes for assemblies.
- Fastener manufacturers to produce parts with consistent dimensions and documented mechanical properties.
- Procurement and quality assurance teams to specify and verify supplied fasteners.
- Maintenance and assembly technicians who require correct part identification and interchangeability.
Typical applications include mechanical equipment, tooling, machine building, electronics enclosures and any application where reliable, compact socket‑head fasteners are required.
Related standards (selected)
Keywords: EN ISO 4762:2004, ISO 4762, hexagon socket head cap screws, M1.6 to M64, product grade A, fastener standard, thread tolerances, mechanical properties.