ISO 4014:2022

Overview

ISO 4014:2022 - Fasteners - Hexagon head bolts - Product grades A and B defines the characteristics, dimensions and conformity requirements for partially threaded hexagon‑head bolts made of steel and stainless steel with metric coarse pitch threads M1.6 to M64. The fifth edition (2022) updates dimensional tables, adds sizes and clarifies rules for standard lengths, and includes marking and labelling requirements.

Keywords: ISO 4014:2022, hexagon head bolts, product grades A and B, metric coarse pitch threads, bolt dimensions, fastener standard.

Key topics and technical requirements

• Scope and materials: Applies to hexagon head bolts in steel and stainless steel for metric coarse pitch threads from M1.6 to M64, and covers product grades A and B.
• Dimensions and tolerances: Detailed head, shank and thread dimensions are specified in Figures 1–2 and Tables 1–6. Annex A provides additional dimensions for product grade B (M1.6 to M14). The standard references ISO 225 for symbols and ISO 4753 / ISO 888 for end and length options.
• Product grades and property classes: Defines product grades A and B and references external documents (e.g., ISO 898‑1 for carbon/alloy steel property classes and ISO 3506‑1 for stainless steel grades) when alternative mechanical or corrosion‑resistant specifications are required.
• Length rules: Rules for shortest and greatest standard lengths are specified (including rounded determinations and maximum length limits).
• Marking and labelling: Clause 6 sets requirements for marking on the product and labelling on packaging to support traceability and conformity assessment.
• Quality and inspection: Normative references include ISO 3269 (acceptance inspection), ISO 6157 (surface discontinuities) and ISO 4759‑1 (tolerances for product grades).

Practical applications and users

ISO 4014:2022 is used to:

• Specify bolt geometry and selection for mechanical design and assembly.
• Create procurement and supplier specifications to ensure interchangeability.
• Guide manufacturing tolerances, tooling and quality control in fastener production.
• Support inspection, acceptance and labelling procedures in supply chains.

Primary users:

• Fastener manufacturers and toolmakers
• Mechanical, structural and product designers
• Procurement and quality assurance professionals
• Maintenance engineers and installers

Related standards (for specification and testing)

• ISO 898‑1 - Mechanical properties (carbon/alloy steel)
• ISO 3506‑1 - Mechanical properties (stainless steel)
• ISO 888 / ISO 4753 - Bolt lengths and thread ends
• ISO 225 - Dimension symbols and descriptions
• ISO 4759‑1, ISO 3269, ISO 6157 - Tolerances, inspection and surface requirements
• ISO 4017 - Fully threaded screws (cross referenced)

Using ISO 4014:2022 ensures consistent, interoperable hexagon‑head bolt specifications across design, manufacture and procurement while aligning with complementary ISO fastener standards.