ISO 4762:2004

Overview

ISO 4762:2004 - Hexagon socket head cap screws specifies the characteristics, dimensions and designation for hexagon socket head cap screws with coarse pitch metric threads from M1.6 up to and including M64 and product grade A. The standard includes detailed dimensional tables, guidance on head and socket form, approximate masses (Annex A) and cross‑references to related ISO requirements for threads, materials and finishes.

Key topics and technical requirements

• Scope and sizing: Covers coarse pitch threads M1.6 to M64 and defines head, socket and shank dimensions (see Figure 1 and Table 1 in the standard).
• Product grade: Applies to Product Grade A fasteners; designation format example: ISO 4762‑M5×20‑12.9.
• Dimensional tolerances & gauging: Socket gauging and combined socket dimensions referred to ISO 23429; thread and size tolerances referenced to ISO 261 and ISO 965 series.
• Mechanical and material requirements: References mechanical property standards for material types:
  • Carbon and alloy steel (ISO 898‑1)
  • Stainless steel (ISO 3506‑1)
  • Non‑ferrous metals (ISO 8839)
• Surface finish and coatings: Electroplating requirements referenced to ISO 4042; zinc‑flake coatings to ISO 10683.
• Surface discontinuities & acceptance: Acceptability limits and inspection procedures are covered by ISO 6157‑1 / 6157‑3 and ISO 3269 respectively.
• Design details: Permissible socket forms, underhead fillet, mouth chamfering, incomplete threads, and maximum underhead fillet dimensions are specified.

Practical applications - who uses ISO 4762:2004

ISO 4762:2004 is used by:

• Fastener manufacturers for production, quality control and product specification.
• Mechanical designers and engineers specifying fasteners in machinery, automotive, aerospace and general engineering assemblies.
• Procurement and quality assurance teams to ensure purchased screws meet internationally accepted dimensions and acceptance criteria.
• Test labs and inspectors applying ISO 3269 inspection procedures or verifying socket dimensions per ISO 23429.

Typical applications: machine assembly, precision equipment, tooling and joinery where hexagon socket head cap screws are required with standardized dimensions and performance.

Related standards (selected)

• ISO 225 - Symbols & designations of dimensions
• ISO 261 / ISO 965 series - Metric thread profiles & tolerances
• ISO 898‑1, ISO 3506‑1, ISO 8839 - Mechanical properties by material
• ISO 4042, ISO 10683 - Coatings and finishes
• ISO 4759‑1 - Tolerances for fasteners (Product grades)
• ISO 23429 - Gauging of hexagon sockets

This standard ensures interoperability, consistent quality and easy specification of hexagon socket head cap screws in metric coarse threads across industries. Keywords: ISO 4762:2004, hexagon socket head cap screws, metric screw threads, product grade A, M1.6–M64, socket gauging, fastener dimensions.